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MINI REVIEW article

Front. Astron. Space Sci., 25 January 2021
Sec. Space Physics
This article is part of the Research Topic The Role of Turbulence in the Solar Wind, Magnetosphere, Ionosphere Dynamics View all 22 articles

The Impact of Turbulence on the Ionosphere and Magnetosphere

  • 1Department of Physics and Technology, University of Tromsø, Oslo, Norway
  • 2Department of Physics and Astronomy, University College London, London, United Kingdom
  • 3Department of Physics, University of Oslo, Oslo, Norway

An important property associated with turbulence in plasmas and fluids is anomalous transport. Plasma, being a good conductor, can in addition be affected by turbulence causing an anomalous resistivity that can significantly exceed its classical counterpart. While turbulent transport may be adequately described in configuration space, some aspects of the anomalous resistivity are best accounted for in phase space. Kinetic phenomena like electron and ion phase space vortices can thus act as obstacles for the free flow of slow charged particles. Plasma instabilities and large amplitude plasma waves are candidates for contributions to the anomalous resistivity by generating such structures. Langmuir waves can be relevant, but also others, such as upper- as well as lower-hybrid waves in magnetized plasmas. Often these anomalous resistivity effects can be small, but due to the large spatial and temporal scales involved in space plasmas, planetary ionosphere and magnetosphere in particular, even such moderate effects can be important. This mini-review is discussing elements of the description of plasma turbulence with particular attention to wave phenomena that contribute to anomalous resistivity and diffusion. Turbulence effects can have relevance for space weather phenomena as well, where ground based and airborne activities relying on for instance Global Positioning and Global Navigation Satellite Systems are influenced by plasma conditions in geospace.

1 Introduction

Plasmas, magnetized plasmas in particular, can support a variety of wave phenomena, electromagnetic as well as electrostatic. These waves can be excited in laboratory experiments, and are frequently found to be generated by some instability mechanisms in naturally occurring plasmas, in the Earth’s ionosphere and magnetosphere in particular, as described by, e.g., Shawhan (1979), Shawhan (1985). Informative summary figures can be found in these works. Controlled laboratory plasma studies often assume conditions where harmonic wave phenomena are excited, but these are rarely met in natural environments where turbulent states are more likely to develop. For some conditions further developed in this review, such turbulent stages can have similarities to classical hydrodynamic turbulence.

In neutral fluids and gases, ‘strongly’ turbulent states often develop, while in plasmas, turbulence is often observed to be ‘weak’. For discussing this distinction, we consider a nonlinear model wave equation (Dupree, 1969; Similon and Sudan, 1990; Galtier, 2009) in the form

Q(k,t)t+iω(k)Q(k,t)=m,nkM,m,n(k,k)Qm(k,t)Qn(kk,t).(1)

The indices {,m,n}{x,y,z} label components of the complex vector Q(k,t). The nonlinear term in the right hand side contains the coupling coefficients M,m,n between components for wavenumbers k and k. Any quadratically nonlinear partial differential equation with a first order time derivative can be brought in the form of Eq. 1 by a Fourier series representation of the variables in configuration space. One such example is the Navier-Stokes equation (Kollmann, 2019) where Q represents the incompressible fluid velocity component u, and iω(k)k2ν, where ν is the fluid kinematic viscosity. For plasma waves, on the other hand, Q can represent the electric field component E, while ω(k) is a linear dispersion relation, which may be complex for some wave vector ranges for linearly unstable systems. We let be a ‘representative’ value of M,m,n, for the Navier-Stokes equation we have, NSk. An effective Reynolds number can be constructed as =Q/ω(k) i.e., the ratio of two time-scales, one originating from the nonlinear part in the right hand side and the other representing the linear part in the left hand side. When Eq. 1 represents the Navier-Stokes equation, we find NSU/(Kν) where U is a ‘representative’ velocity and K a ‘representative’ wavenumber. For a pipe flow, U would be the injected flow velocity and K1/D the inverse diameter of the pipe. When Uν/D, we expect nonlinearity to dominate and strong turbulence to develop. For fluids and gases, where ν is generally small, this condition is easily fulfilled and we can anticipate that strongly turbulent states can be obtained. In the limit where ω(k) is negligible, the dynamics of fluids or gases is solely due to nonlinear effects. For the Navier-Stokes equation, this is the case for the limit where k2ν is negligible. For a plasma, the situation is frequently the opposite (Dupree, 1969), the linear part ω(k) is often large. For Langmuir waves ω(k)ωpe, the electron plasma frequency. The corresponding plasma Reynolds number is PP/ω(K), with being a representative electrostatic electric field value, and K a representative wavenumber to be determined by some externally imposed parameters, e.g., the geometry. P is often a small number, resulting in a weakly turbulent state (Dupree, 1969; Pécseli, 2016). Models for weak turbulence have been developed for plasma sciences (Kadomtsev, 1965; Nicholson, 1983; Horton, 1985; Kono and Škorić, 2010). Depending on the plasma conditions, the magnetization for instance, both strongly and weakly turbulent conditions can be found.

Diagnostic tools involving two-point measurements that can distinguish strong and weak turbulence have been developed (Iwama et al., 1979; Beall et al., 1982; Pécseli, 2015). In some cases, the linear dispersion relation can be identified in the (ω,k)-space, thus demonstrating the importance of the ω(k) term in Eq. 1, while for strongly turbulent conditions a similar analysis shows enhanced amplitudes for a wide range of wave vectors with no discernible frequency-wavenumber relation.

Classical physics, and thus also plasma physics, used to rest on a two-fold basis: theory and observations, the latter including results from controlled laboratory experiments. With the development of efficient high-speed computing, it has become possible to make numerical simulations on a level competing with laboratory results. Modern physics, also plasma physics, now rests on a basis of three pillars, theory, experiment and numerical simulations (Post and Votta, 2005; Hut, 2006). Use of advanced high performance computing techniques allow massively parallel computations involving tens of thousands of cores. Modern numerical simulations can in many cases serve as a substitute for experiments. Fine details in the variations of the magnetospheric plasma can now be resolved in numerical simulations (von Alfthan et al., 2014). Predictions of such details can be important for instance for space weather phenomena (Morley, 2020) that can have effects being important for activities on ground. Scintillations in the plasma index of refraction affecting Global Positioning Systems (GPS) and Global Navigation Satellite Systems (GNSS) offer examples (Jin et al., 2020). The energy source for intense space weather phenomena is often found in solar outbursts that give rise to fluctuations in the Earth’s plasma environment (Sato et al., 2019). Numerical simulations can also give support when interpreting observations made by instrumented spacecraft. If the simulations reproduce the observed data, it can be assumed that the numerical results can be trusted also for information not directly accessible for confirmation by measurements.

2 Turbulent Spectra

2.1 Strong Turbulence in Neutral Fluids

Fully developed strong turbulence in incompressible neutral flows develops a universal continuous power spectrum F(k) for the velocity fluctuations. Ignoring intermittency effects, a spectrum characterizing an inertial subrange for homogeneous and isotropic conditions is found to follow a power law CKϵ2/3k5/3, the Kolmogorov-Obukhov spectrum, where ϵ is the energy dissipation rate per unit fluid mass, and CK the Kolmogorov constant (Sreenivasan, 1995) which has to be determined experimentally. For shorter wavelengths, Heisenberg (1948) predicted the existence of a viscous spectral subrange following a k7 power law (Heisenberg and Taylor, 1948; Beran, 1968). Although some numerical and experimental studies seem to offer support for this result, it is unlikely to be correct (Landahl and Mollo-Christensen, 1992) since it predicts that, for instance, the integral for spatial derivative spectrum (Bendat, 1958) of mth order, 0k2mF(k)dk, diverges for m3. This would imply that the flow develops singular third and higher order spatial derivatives. There are no indications that the Navier-Stokes equation has this property for three-dimensional turbulence with ‘smooth’ initial conditions (Sulem et al., 1983; Constantin, 1991), and there is no natural wavenumber associated with the Navier-Stokes equation to give an upper limit for a viscous subrange. For turbulence confined to two-spatial dimensions, the situation might be different. The classical Kolmogorov-Obukhov result implicitly assumes the energy dissipation ϵ to be a deterministic quantity. In reality, it is randomly fluctuating so that the dissipation can take place in ‘hot spots’ i.e., within intermittent spatial regions and time periods (Novikov, 1990; Davidson, 2004; Kollmann, 2019).

When additional energy is injected into a three-dimensional turbulent field, classical turbulence models predicts the energy to cascade toward smaller scales by a ‘vortex-stretching’ mechanism (Tennekes and Lumley, 1972). One feature of two-dimensional turbulence is that energy can cascade toward larger scales. Convincing observations of this process seems to be missing in space plasmas, but it has been amply demonstrated by numerical simulations. Turbulence models in two spatial dimensions (Hasegawa and Mima, 1978; Kraichnan and Montgomery, 1980; Gruzinov and Pogutse, 1986) are relevant for low frequency phenomena confined to a plane B in magnetized plasmas.

2.2 Strong Turbulence in Plasmas

One important parameter classifying plasma conditions is β, the ratio of plasma to magnetic pressure. Note that β(Cs/VA)2, the square ratio of the ion acoustic sound speed to the Alfvén velocity. In the near Earth environment we usually have β1. For larger β-values, as in the Solar wind, a coupling between transverse electromagnetic perturbations and compressional modes can be expected in magnetized plasmas.

There are no obvious reasons for turbulent spectra to follow a power law, but it has been found to be the case sometimes also for fully developed strong plasma turbulence. There are thus solid evidences that fully developed strong resistive electrostatic drift-wave turbulence in plasmas confined by strong magnetic fields develops a k5 power-law spectral subrange for fluctuations in the electrostatic potential (Tchen et al., 1980; Pécseli, 2015; Pécseli, 2016). The continuation of this drift-wave spectrum to wavelengths shorter than the ion Larmor radius remains poorly understood.

The conditions in the Earth’s ionospheric E- and F-regions are special due to the importance of collisions between charged and neutral particles. It has been speculated that also some low-frequency ionospheric waves in these regions can develop strong turbulence with universal power law spectra (Ott and Farley, 1974; Sudan and Keskinen, 1977; Sudan, 1983; Hassam et al., 1986), but the conjecture has not been studied systematically in any detail (Pécseli, 2016), although some observations and numerical simulations seem to be consistent with the hypothesis (Kelley, 1989). Studies of rocket data, in particular, have shown power law spectra for both fluctuating plasma density and electrostatic potential (Basu et al., 1988; Krane et al., 2000; Dyrud et al., 2006) in reasonable agreement also with laboratory results (Mikkelsen and Pécseli, 1980). Intermittency is also found to be an issue for plasma turbulence (Dyrud et al., 2008). Parts of it has to do with coherent interactions of large amplitude waves in a background of a low level of turbulence (Vladimirov and Stenflo, 1997).

Fully developed strong plasma turbulence with a large β-value is mostly found in the solar wind as summarized by e.g., Bruno and Carbone (2005), where conditions are well described by magnetohydrodynamics (MHD). Turbulent plasma energy spectra (i.e., the sum of kinetic and magnetic energy), in the form (ϵVA)1/2k3/2, have been predicted by Iroshnikov (1964) and Kraichnan (1965). It has been found that large scale cavities can form in the Earth’s magnetosphere (Fritz et al., 2003) where the magnetic field strength is small, thus creating large regions with relatively large β-value where the Iroshnikov-Kraichnan results are also relevant. A worthwhile investigation would be to analyze the energy spectra for these conditions.

2.2.1 Plasma Turbulence as a ‘Soliton Gas’

Turbulence is associated with many degrees of freedom being excited. An intermediate scenario has been suggested, where a nonlinear evolution of waves saturate in an ensemble of solitons (Kingsep et al., 1973; Dysthe et al., 1986). Once excited, these solitons will collide but recover their original form after collisions (Drazin and Johnson, 1989). Each of these nonlinear structures are described by a wide band of phase coherent Fourier components, so that each soliton can be described by a reduced number of parameters, such as amplitude, width, position and velocity, where some of these parameters can be interrelated as for instance for Korteweg-de Vries solitons (Drazin and Johnson, 1989). This turbulence model can seem unrealistic since most soliton studies refer to spatially one dimensional problems. Several observations can, however, be discussed in terms of this framework. In these cases the wave field can be accounted for by a random distribution of slowly evolving semi-coherent structures, possibly in a background of random noise. A simple spectral analysis does not account for coherent phase relations and the diagnostic methods have to be supplemented by, for instance, triple correlations or bispectral methods (Kim and Powers, 1978). Large coherent structures are best identified by conditional sampling of the data (Johnsen et al., 1987), possibly supplemented by filtering methods, matched filters for instance (Teliban et al., 2007; Fredriksen et al., 2008).

2.3 Taylor’s Hypothesis

Measurements of wavenumber power spectra require a minimum of ‘two-point’ measurements with movable probes. Often, this is not possible, and only time series obtained at one probe position are available. An almost universally used approximation, the Taylor’s hypothesis or frozen turbulence approximation, is relates measured frequencies to wavenumbers (Taylor, 1938; Shkarofsky, 1969; Wyngaard and Clifford, 1977). Here it is implicitly argued that the wave field is swept rapidly past the observation point (onboard e.g., an instrumented rocket or a spacecraft), so that the time variation observed is actually due to a moving spatial variation i.e., ωkUkU, where ω is the detected frequency, and U the relative velocity between the turbulent medium and the observer. Since the frequency ω is only related to the wave vector component k along U, application of Taylor’s hypothesis may need to be combined with assumptions of homogeneity and isotropy in two or three dimensional space. Both scalar and vector spectra can be defined so that the total power is e.g., ϕ2=0F(k)dk, or alternatively ϕ2=G(k)d3k. The physical dimension of the spectra F and G are different, and care should be taken not to confuse them, in particular when comparing theoretical and experimental results (Mikkelsen and Pécseli, 1980). The distinction of spectral definition is relevant also for power spectra in two spatial dimensions, e.g., in a plane B.

3 Turbulent Transport

One of the most important properties associated with turbulence is anomalous transport. This is particularly true for confinement of fusion plasmas physic and in many industrial applications. In space, the anomalous transport of plasma across magnetic field lines is important for the spatial distribution of plasma (Horton, 1990). To illustrate this problem, we take a low-β plasma confined by a homogeneous magnetic field B. The transport is often due to electrostatic fields, E=ϕ, with frequencies well below the ion cyclotron frequency Ωci. The ion fluid velocity E×B/B2+Ωci1(B2E/t+(E×B)E)/B3 is taken to be perpendicular to the magnetic field. Nonlinearities enter through the ion polarization drifts, being the second bracketed term in the ion flow velocity. Finite ion Larmor radius effects (Knorr et al., 1988; Hansen et al., 1989; Chen, 2016) are usually not accounted for. Allowing for a slight deviation from strictly B-normal wave propagation, the electrons can flow along the magnetic field lines to obtain an isothermal Boltzmann equilibrium, ne=n0(r)exp(eϕ/Te) where Te is the electron temperature and n0(r) is a reference density allowed to vary across magnetic flux tubes (Chen, 2016) i.e., rB. In the quasi-neutral limit, nenin, keeping only the terms up to second order, the Hasegawa-Mima (HM) equation (Hasegawa and Mima, 1978; Gruzinov and Pogutse, 1986; Albert et al., 1990) is readily derived. It has been widely applied to study weakly nonlinear electrostatic drift waves in low-β plasmas. Also this equation can be expressed (Albert et al., 1990) in the form of Eq. 1. The HM-equation has linearly stable solutions, but it accounts for the interaction of many modes excited by a source. Linearly unstable resistive electrostatic drift waves are described by the Hasegawa-Wakatani (HW) set of equations (Hasegawa and Wakatani, 1983), which extend the HM-equation. Numerical solutions of the HW-equation have been found to evolve into a strongly turbulent state with a continuous power spectrum as summarized elsewhere (Pécseli, 2015). When the magnetic field is weaker, βme/mi, the electron motion can couple to Alfvén waves and the equations have to be modified, but the possibility for a strongly turbulent state remains.

The space-time variations of low frequency, large spatial scale electromagnetic fluctuations in high-β plasmas is well described by the MHD equations, and strongly turbulent states can develop (Goedbloed and Poedts, 2004; Bruno and Carbone, 2005; Galtier, 2009). Relevant space observations relates, for instance, to clouds in the interstellar medium composed of ionized hydrogen atoms (H II regions), regions with neutral atomic hydrogen (H I) and to diffuse nebula or emission nebula (Cox, 2005). On astronomical scales, we find H I and H II regions to be clearly separated. This can be seen as a paradox since on such large scales relevant for interstellar media we could expect correspondingly large Reynolds numbers. Such a turbulent state should result in a strong mixing smearing out boundaries between the H I and H II regions in contradiction with observations. A possible explanation for the lack of turbulent mixing could be that there is not sufficient free energy available to drive a substantial high-β MHD-turbulence on those scales.

Anomalous transport can be particularly important for the plasma at the boundaries between the solar wind and the magnetosphere i.e., the polar cusps and the magnetopause. The cusps offer a particularly easy access between the two regions (D’Angelo, 1977; Fritz et al., 2000). Solar wind plasma particles can thus get direct access to the Earth’s ionosphere through the northern and southern cusp points. The shear flow at the interface between open and closed magnetic field lines can give fluid-like Kelvin-Helmholtz (KH) instabilities that can mediate anomalous transport between the two regions. The nonlinear saturated stage of the KH instability plays a critical role for the solar wind interaction with the Earth’s magnetosphere (Johnson et al., 2014; Ma et al., 2017).

The solar wind, supersonic and superalfvenic at 1AU, is an important source of free energy driving turbulence on large spatial scales in the Earth’s magnetosphere. The coupling between the solar wind and the plasma of the Earth magnetosphere can involve magnetic field reconnection, and the efficiency of these processes depends critically on the polarity of the interplanetary magnetic field (IMF) with respect to the Earth’s magnetic field. The process will depend on the solar activity as evidenced by its correlation with the distribution and intensity of ionospheric plasma irregularities (Jin et al., 2020). The coupling process itself can be accounted by resistive MHD, but resistivity due to classical collisions is found to be insufficient for the relevant plasma parameters. Anomalous resistivity has been suggested as a remedy for explaining enhanced reconnection rates. Lower hybrid wave turbulence can be one source of such anomalous resistivity (Huba et al., 1977), and this wavetype is indeed observed near the Earth’s magnetopause (Graham et al., 2017). There is, however, seemingly no consensus on the detailed nature of the relevant anomalous resistivity, nor agreement concerning the origin of the free energy driving the necessary plasma instabilities (Biskamp, 1997).

The discussion of turbulent transport, so far, dealt with ‘absolute turbulent diffusion’, a phenomenon that is adequately accounted by considering a single representative particle moving with respect to its origin of release. Alternatively a problem of ‘relative diffusion’ can be formulated, which can be described by the relative motion of two particles (Misguich et al., 1987). The two problems are substantially different: the first case refers to motion in a fixed frame, the later to the center of mass frame moving randomly itself. Relative motion is important for discussing the expansion of a cloud of contaminants instantly released. This could be a barium cloud released in a controlled experiment described by e.g., Haerendel (2019), or micro meteorites evaporating in the ionosphere. In a magnetized plasma the problems of anomalous transport are strongly anisotropic regarding the directions along and across magnetic field lines.

4 Anomalous Resistivity

Since plasma in space is a highly conductive medium, its dynamics is particularly sensitive to changes in current distributions, and the electric and magnetic fields being induced. In a magnetized plasma under normal conditions, the ions dominate the B-transverse current, while the electrons usually carry the current along the magnetic field lines. Obstacles to the free electron flow can be caused by fluid or by kinetic effects (Dupree, 1970; Papadopoulos, 1977; Büchner and Elkina, 2006). These obstacles can be generated by nonlinear wave phenomena (Davidson and Gladd, 1975; Guio and Forme, 2006). While classical resistivity is caused by particle collisions with known collision frequency, we can find an equivalent nonlinear source induced by kinetic wave-particle interactions giving rise to an anomalous collision frequency affecting the electron as well as the ion dynamics.

Together with other sources, the interaction between the solar wind flow and the Earth’s magnetosphere can impose large scale steady state electric fields perpendicular to the magnetic field (Kelley, 1989). This electric field drives the equatorial and the auroral electrojets, predominantly in the ionospheric E-region. The classical resistivity is too small to give any significant energy deposition by this electric field. Low frequency plasma sound waves can, however, be excited in the collisional ionospheric E-region due to a modified two-stream instability, the Farley-Buneman (FB) instability found by Farley (1963) and Buneman (1963) independently. It can also develop into a turbulent spectrum (Mikkelsen and Pécseli, 1980; Krane et al., 2000; Pécseli, 2015; Young et al., 2020). An enhanced anomalous collision frequency induced by these fluctuations can give rise to a bulk heating of the plasma while saturating the instability (Schlegel and St.-Maurice, 1981; Primdahl, 1986; Oppenheim et al., 1996). It was anticipated (Pécseli, 2015) that the turbulence generated by the FB instability have similarities with the current driven ion sound instability (Kadomtsev, 1965; Machalek and Nielsen, 1973; Horton, 1985). The stability conditions in the ionospheric E- and F-regions are complicated by the possibility for two instabilities being present at the same time (Sudan, 1983), a gradient instability and the two-stream FB-instability mentioned before.

The nature of the obstacles inhibiting the free electron flow can be kinetic, while others can adequately be described by a simpler fluid model. Their excitation requires free energy and they can form as a result of a plasma instability, such as current driven instabilities (Büchner and Elkina, 2006), where the nonlinear saturated stage is often found to form phase space vortices, an ubiquitous nonlinear kinetic plasma phenomenon (Bernstein et al., 1957; Morse and Nielson, 1969; Lynov et al., 1979; Saeki et al., 1979; Pécseli et al., 1984; Schamel, 1986; Drake et al., 2003). These vortices are found also as three dimensional forms in magnetized plasmas (Børve et al., 2001; Daldorff et al., 2001), while they appear to be unstable for unmagnetized conditions in two or three spatial dimensions as observed in numerical simulations by Morse and Nielson (1969). Phase space structures are observed in space plasmas (Ergun et al., 1998; Tong et al., 2018; Wang et al., 2020), albeit often with relatively small spatial scales. Laboratory experiments and particle simulations (Morse and Nielson, 1969; Saeki et al., 1979; Pécseli et al., 1984; Guio et al., 2003) demonstrate the existence of structures also at large spatial scales in units of the Debye length. Current driven instabilities can indirectly cause localized potential variations by, in a first step, exciting plasma waves, Langmuir waves for instance. By their nonlinear evolution these structures form localized coherent electrostatic structures. Vortices in ion as well as electron phase space can also be formed by particle beams, or particle bursts (Morse and Nielson, 1969; Sakanaka, 1972; Børve et al., 2001; Guio et al., 2003; Wang et al., 2020). Such beams can have their origin in electrostatic double layers (Sato et al., 1981; Jovanović et al., 1982; Schamel, 1986) separating high and low potential regions connected by magnetic field lines. Such regions are observed as ‘inverted V-events’ by instrumented space craft (Partamies et al., 2008). Significant plasma wave amplitudes can also be excited during ionospheric heating experiments (Hanssen et al., 1992; Dubois et al., 1993). Here we give a brief discussion of some wave types that can play a role in the nonlinear plasma dynamics.

4.1 Electron Plasma Waves

For unmagnetized plasmas the only high frequency electrostatic waves are the Langmuir waves. In magnetized plasmas, the wave dispersion relation includes upper-hybrid waves propagating at large angles to the magnetic field. The nonlinear features of these electron waves have been studied intensively (Thornhill and ter Haar, 1978; Briand, 2015) with particular attention to the wave-collapse phenomenon, where an initial spatial wave distribution collapses to a singularity in a finite time (Zakharov, 1972; Rasmussen and Rypdal, 1986; Robinson, 1997; Kono and Škorić, 2010). It has been amply demonstrated that Langmuir waves collapse as a physical phenomenon is realizable, but so far there seems to be no evidence that it plays any significant role in nature. In its classical form, the collapse phenomenon refers to an initial value problem where a localized large amplitude wave-field is excited. One element in the phenomenon, cavitation of Langmuir waves, is believed to be important under ‘driven’ conditions where a continuous external energy source is present. This can be in the form of naturally occurring particle beams (Forme, 1999; Guio and Forme, 2006; Isham et al., 2012; Akbari et al., 2016) or perturbations induced from the ground through ionospheric heating experiments (Hanssen et al., 1992; Dubois et al., 1993). Wave cavities can be described by a random distribution of slowly evolving and weakly interacting structures resembling wave-filled plasma density depletions.

4.2 Lower-Hybrid Waves

In magnetized plasmas, the lower-hybrid waves play a particular role by having an approximately equal distribution of the wave energy between the electron and the ion components. The nonlinear space-time evolution has been studied analytically (Musher and Sturman, 1975; Sotnikov et al., 1978; Shapiro et al., 1993) for these wave types. Such waves have indeed been observed in nature with solid indications of a nonlinear evolution (Kjus et al., 1998; Høymork et al., 2000; Schuck et al., 2003; Schuck et al., 2004), but it remains questionable whether this evolution can be attributed to wave-collapse phenomena (Pécseli et al., 1996; Pécseli and Trulsen, 2006). The scales of the local wave packets in the B-transverse direction are well known from satellite observations, but the magnetic field aligned length scales have not been studied in space. All we know is that these scale lengths are very large, probably limited by collisional mean free paths (Pécseli et al., 1996), and this makes also numerical simulations challenging. Lower-hybrid drift waves excited at steep plasma density gradients can also contribute to anomalous transport and plasma heating as suggested by Davidson and Gladd (1975). Lower-hybrid drift waves have been observed in space (Huba et al., 1978; Bale et al., 2002; Walker et al., 2008; Graham et al., 2017) but the associated transport properties have not been fully documented.

The soliton turbulence model described in Section 2.1 can seem unrealistic, but observations (Pécseli et al., 1997) of an ensemble of saturated lower-hybrid wave structures show examples that can be interpreted by such a model. The properties of such individual structures have been studied as well, with results summarized by Schuck et al. (2003).

4.3 Whistlers

Electromagnetic waves, whistlers, with frequencies below the electron cyclotron resonance frequency can propagate in magnetized plasmas (Stenzel, 2016). In a limited frequency range, Ωciωωce, whistler waves can be seen as electron equivalents to MHD waves (Kingsep et al., 1990; Biskamp et al., 1999; Stenzel, 1999; Galtier, 2009; Lyutikov, 2013). Such waves are frequently observed in the ionosphere (Yeh and Liu, 1972). Often whistlers appear in form of wide band electromagnetic modes, Chorus (Shawhan, 1985; Li et al., 2019; Aryan et al., 2020), or as Hiss in plasmaspheric plumes (Zhang et al., 2019). Seemingly, whistlers are often observed at modest amplitudes, but evidence for weakly nonlinear effects in form of self-ducting (Karpman et al., 1974, 1990) have been reported by Bell (1985). The basic features of whistlers are well explained by fluid models (Yeh and Liu, 1972) but details in the wave energy distributions need kinetic models to account for nonlinear wave-particle couplings (Dysthe, 1971; Nakamura et al., 2018). The evolution of wide band whistler wave spectra have been studied by fluid models (Biskamp et al., 1999; Cho and Lazarian, 2009) indicating that universal energy power spectral subranges with a k7/3 wavenumber scaling can develop.

5 Discussion

Weakly nonlinear wave phenomena include parametric decay and modulational instabilities, usually described in terms of three and four wave phenomena. Most studies refer to the stability of processes involving modulated plane waves. In nature this condition is unlikely to be found, broad band wave spectra are much more often observed. Simple physical arguments (Alber, 1978; Pécseli, 2014) give that a wave-decay or a modulational instability involving wavelengths longer than the correlation length (i.e., the inverse wavenumber spectral width) associated with the spectrum are stable (Alber, 1978; Pécseli, 2014), although details will differ for decay and modulational instabilities. For ocean waves this argument seems to hold promise (Alber, 1978; Dysthe et al., 2003). Heuristic arguments then implie that, due to nonlinear effects, the wavenumber spectra should broaden until some quasi stationary conditions are established. Analytical studies of electron plasma waves in magnetized as well as unmagnetized plasmas (Bhakta and Majumder, 1983; Pécseli, 2014; Kono and Pécseli, 2016; Kono and Pécseli, 2017a; Kono and Pécseli, 2017b) demonstrated that with the given assumptions a wide band spectrum was indeed less unstable than a narrow band. The results did not, however, predict complete modulation- or parametric decay-stabilizations for wide band wavenumber spectra: this could be due to a simplifying quasi-normal (sometimes termed quasi-Gaussian) assumption (Leslie, 1973; Alber, 1978) made in the analysis. The scenario outlined here has not been systematically analyzed experimentally nor numerically for plasma media. For numerical tests it is possible that one dimensional simulations can suffice. The low frequency decay products of modulational as well as oscillating two-stream instabilities do not obey any dispersion relation (Thornhill and ter Haar, 1978; Kono and Škorić, 2010; Pécseli, 2014). This feature is common to BGK-type phase space structures (Bernstein et al., 1957), such as phase space vortices, making it difficult to distinguish the phenomena by remote sensing, e.g., radio wave scattering (Vierinen et al., 2017).

6 Conclusion

Turbulence in fluids and plasmas have been studied for over a century but is still considered to represent one of the major unresolved problems in nonlinear physics. Elements in the theory of classical fluid turbulence, intermittency in particular, are not fully understood, but the available understanding suffices to allow adequate predictions for central problems such as turbulent transport also under inhomogeneous conditions. The understanding of plasma turbulence, for magnetized plasmas in particular, has not reached the same level, although convincing agreement between analytical results and observations have been achieved for a number of specific questions. Theories for weak turbulence in plasmas are well established and tested, in particular for the special case of ‘quasi linear theory’ (Kadomtsev, 1965) which accounts for the spreading in velocity space of an electron beam exciting electron plasma waves (Kontar, 2001; Ratcliffe et al., 2014). Generalizations and extensions of the analysis have been suggested (Orszag and Kraichnan, 1967; Horton, 1985; Similon and Sudan, 1990), but it is not known how well these models perform in comparison with observations, or realistic numerical simulation results of plasma turbulence.

Author Contributions

Both authors have made a substantial, and direct, contribution to the work and approved it for publication.

Conflict of Interest

The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Acknowledgments

The authors thank Professor Lennart Stenflo and Professor Jan Trulsen for valuable discussions.

References

Akbari, H., Guio, P., Hirsch, M. A., and Semeter, J. L. (2016). Zakharov simulations of beam-induced turbulence in the auroral ionosphere. J. Geophys. Res. Space Phys. 121, 4811–4825. doi:10.1002/2016JA022605

CrossRef Full Text | Google Scholar

Alber, I. E. (1978). Effects of randomness on stability of two-dimensional surface wavetrains. Proc. Roy. Soc. Lond. 363, 525–546. doi:10.1098/rspa.1978.0181

CrossRef Full Text | Google Scholar

Albert, J. M., Similon, P. L., and Sudan, R. N. (1990). Almost two–dimensional treatment of drift wave turbulence. Phys. Fluid. Plasma Phys. 2, 3032–3039. doi:10.1063/1.859370

CrossRef Full Text | Google Scholar

Aryan, H., Agapitov, O. V., Artemyev, A., Mourenas, D., Balikhin, M. A., Boynton, R., et al. (2020). Outer radiation belt electron lifetime model based on combined van Allen probes and Cluster VLF measurements. J. Geophys. Res. Space Physics. 125, e2020JA028018. doi:10.1029/2020JA028018

CrossRef Full Text | Google Scholar

Bale, S. D., Mozer, F. S., and Phan, T. (2002). Observation of lower hybrid drift instability in the diffusion region at a reconnecting magnetopause. Geophys. Res. Lett. 29, 33–1–33–4. doi:10.1029/2002GL016113

CrossRef Full Text | Google Scholar

Basu, S., Basu, S., MacKenzie, E., Fougere, P. F., Coley, W. R., Maynard, N. C., et al. (1988). Simultaneous density and electric field fluctuation spectra associated with velocity shears in the auroral oval. J. Geophys. Res. 93, 115–136. doi:10.1029/JA093iA01p00115

CrossRef Full Text | Google Scholar

Beall, J. M., Kim, Y. C., and Powers, E. J. (1982). Estimation of wavenumber and frequency spectra using fixed probe pairs. J. Appl. Phys. 53, 3933–3940. doi:10.1063/1.331279

CrossRef Full Text | Google Scholar

Bell, T. F. (1985). High-amplitude VLF transmitter signals and associated sidebands observed near the magnetic equatorial plane on the ISEE 1 satellite. J. Geophys. Res. 90, 2792–2806. doi:10.1029/JA090iA03p02792

CrossRef Full Text | Google Scholar

Bendat, J. S. (1958). Principles and applications of random noise theory. New York: John Wiley & Sons. doi:10.1002/qj.49708536318

CrossRef Full Text | Google Scholar

Beran, M. J. (1968). Statistical continuum theories, vol. 9 of monographs in statistical physics and thermodynamics. New York: Interscience.

CrossRef Full Text | Google Scholar

Bernstein, I. B., Greene, J. M., and Kruskal, M. D. (1957). Exact nonlinear plasma oscillations. Phys. Rev. 108, 546–550. doi:10.1103/PhysRev.108.546

CrossRef Full Text | Google Scholar

Bhakta, J. C., and Majumder, D. (1983). Effect of finite spectral width on the modulational instability of Langmuir waves. J. Plasma Phys. 30, 203–209. doi:10.1017/S0022377800001124

CrossRef Full Text | Google Scholar

Biskamp, D. (1997). Magnetic reconnection in plasmas. Astrophys. Space Sci. 242, 165207. doi:10.1007/BF00645113

CrossRef Full Text | Google Scholar

Biskamp, D., Schwarz, E., Zeiler, A., Celani, A., and Drake, J. F. (1999). Electron magnetohydrodynamic turbulence. Phys. Plasmas. 6, 751–758. doi:10.1063/1.873312

CrossRef Full Text | Google Scholar

Børve, S., Pécseli, H. L., and Trulsen, J. (2001). Ion phase-space vortices in 2.5-dimensional simulations. J. Plasma Phys. 65, 107–129. doi:10.1017/s0022377801008947

CrossRef Full Text | Google Scholar

Briand, C. (2015). Langmuir waves across the heliosphere. J. Plasma Phys. 81, 325810204. doi:10.1017/S0022377815000112

CrossRef Full Text | Google Scholar

Bruno, R., and Carbone, V. (2005). The solar wind as a turbulence laboratory. Living Rev. Sol. Phys. 10, 1–162. doi:10.12942/lrsp-2013-2

CrossRef Full Text | Google Scholar

Büchner, J., and Elkina, N. (2006). Anomalous resistivity of current-driven isothermal plasmas due to phase space structuring. Phys. Plasmas. 13, 082304. doi:10.1063/1.2209611

CrossRef Full Text | Google Scholar

Buneman, O. (1963). Excitation of field aligned sound waves by electron streams. Phys. Rev. Lett. 10, 285–287. doi:10.1103/PhysRevLett.10.285

CrossRef Full Text | Google Scholar

Chen, F. F. (2016). Introduction to plasma physics and controlled fusion. 3rd Edn. Heidelberg: Springer.

CrossRef Full Text | Google Scholar

Cho, J., and Lazarian, A. (2009). Simulations of electron magnetohydrodynamic turbulence. Astrophys. J. 701, 236–252. doi:10.1088/0004-637x/701/1/236

CrossRef Full Text | Google Scholar

Constantin, P. (1991). “New perspectives in turbulence,” in Remarks on the Navier-Stokes equations. (Berlin: Springer-Verlag), Chap. 8, 229–261.

CrossRef Full Text | Google Scholar

Cox, D. P. (2005). The three-phase interstellar medium revisited. Annu. Rev. Astron. Astrophys. 43, 337–385. doi:10.1146/annurev.astro.43.072103.150615

CrossRef Full Text | Google Scholar

Daldorff, L. K. S., Guio, P., Børve, S., Pécseli, H. L., and Trulsen, J. (2001). Ion phase space vortices in 3 spatial dimensions. Europhys. Lett. 54, 161–167. doi:10.1209/epl/i2001-00290-6

CrossRef Full Text | Google Scholar

Davidson, P. A. (2004). Turbulence. An introduction for scientists and engineers. United Kingdom: Oxford University Press.

CrossRef Full Text | Google Scholar

Davidson, R. C., and Gladd, N. T. (1975). Anomalous transport properties associated with the lower-hybrid-drift instability. Phys. Fluids. 18, 1327–1335. doi:10.1063/1.861021

CrossRef Full Text | Google Scholar

Drake, J. F., Swisdak, M., Cattell, C., Shay, M. A., Rogers, B. N., and Zeiler, A. (2003). Formation of electron holes and particle energization during magnetic reconnection. Science. 299, 873–877. doi:10.1126/science.1080333

PubMed Abstract | CrossRef Full Text | Google Scholar

Drazin, P. G., and Johnson, R. S. (1989). Solitons: an introduction. Cambridge, UK: Cambridge University Press.

CrossRef Full Text | Google Scholar

Dubois, D. F., Hanssen, A., Rose, H. A., and Russell, D. (1993). Space and time distribution of HF excited Langmuir turbulence in the ionosphere: comparison of theory and experiment. J. Geophys. Res. 98, 17543–17567. doi:10.1029/93JA01469

CrossRef Full Text | Google Scholar

Dupree, T. H. (1969). “Turbulence in fluids and plasmas,” in Microwave research institute symposia series. Introduction to basic phenomena of turbulence in plasmas. (Brooklyn, N.Y., Polytechnic Press), Chap. 2, Vol. XVIII, 3–12.

CrossRef Full Text | Google Scholar

Dupree, T. H. (1970). Theory of resistivity in collisionless plasma. Phys. Rev. Lett. 25, 789–792. doi:10.1103/PhysRevLett.25.789

CrossRef Full Text | Google Scholar

Dyrud, L., Krane, B., Oppenheim, M., Pécseli, H. L., Schlegel, K., Trulsen, J., et al. (2006). Low-frequency electrostatic waves in the ionospheric E-region: a comparison of rocket observations and numerical simulations. Ann. Geophys. 24, 2959–2979. doi:10.5194/angeo-24-2959-2006

CrossRef Full Text | Google Scholar

Dyrud, L., Krane, B., Oppenheim, M., Pécseli, H. L., Trulsen, J., and Wernik, A. W. (2008). Structure functions and intermittency in ionospheric plasma turbulence. Nonlinear Process Geophys. 15, 847–862. doi:10.5194/npg-15-847-2008

CrossRef Full Text | Google Scholar

Dysthe, K. B. (1971). Some studies of triggered whistler emissions. J. Geophys. Res. 76, 6915–6931. doi:10.1029/JA076i028p06915

CrossRef Full Text | Google Scholar

Dysthe, K. B., Pécseli, H. L., and Trulsen, J. (1986). A statistical model for soliton particle interaction in plasmas. Phys. Scr. 33, 523. doi:10.1088/0031-8949/33/6/007

CrossRef Full Text | Google Scholar

Dysthe, K. B., Trulsen, K., Krogstad, H. E., and Socquet-Juglard, H. (2003). Evolution of a narrow-band spectrum of random surface gravity waves. J. Fluid Mech. 478, 110. doi:10.1017/S0022112002002616

CrossRef Full Text | Google Scholar

D’Angelo, N. (1977). Plasma waves and instabilities in the polar cusp: a review. Rev. Geophys. 15, 299–307. doi:10.1029/RG015i003p00299

CrossRef Full Text | Google Scholar

Ergun, R. E., Carlson, C. W., McFadden, J. P., Mozer, F. S., Muschietti, L., Roth, I., et al. (1998). Debye-scale plasma structures associated with magnetic-field-aligned electric fields. Phys. Rev. Lett. 81, 826–829. doi:10.1103/PhysRevLett.81.826

CrossRef Full Text | Google Scholar

Farley, D. T. (1963). Two-stream plasma instability as a source of irregularities in the ionosphere. Phys. Rev. Lett. 10, 279–282. doi:10.1103/PhysRevLett.10.279

CrossRef Full Text | Google Scholar

Forme, F. R. E. (1999). Parametric decay of beam-driven Langmuir wave and enhanced ion-acoustic fluctuations in the ionosphere: a weak turbulence approach. Ann. Geophys. 17, 1172–1181. doi:10.1007/s00585005084210.1007/s00585-999-1172-4

CrossRef Full Text | Google Scholar

Fredriksen, Å., Pécseli, H. L., and Trulsen, J. (2008). Crash and recovery of the potential in a toroidal plasma column, as observed by generalized conditional sampling. New J. Phys. 10, 033030. doi:10.1088/1367-2630/10/3/033030

CrossRef Full Text | Google Scholar

Fritz, T. A., Chen, J., and Sheldon, R. B. (2000). The role of the cusp as a source for magnetospheric particles: a new paradigm?. Adv. Space Res. 25, 1445–1457. doi:10.1016/S0273-1177(99)00656-0

CrossRef Full Text | Google Scholar

Fritz, T. A., Chen, J., and Siscoe, G. L. (2003). Energetic ions, large diamagnetic cavities, and Chapman-Ferraro cusp. J. Geophys. Res. Space Phys. 108, 1028. doi:10.1029/2002JA009476

CrossRef Full Text | Google Scholar

Galtier, S. (2009). Wave turbulence in magnetized plasmas. Nonlinear Process Geophys. 16, 83–98. doi:10.5194/npg-16-83-2009

CrossRef Full Text | Google Scholar

Goedbloed, H., and Poedts, S. (2004). Principles of magnetohydrodynamics with applications to laboratory and astrophysical plasmas. Cambridge, UK: Cambridge.

CrossRef Full Text | Google Scholar

Graham, D. B., Khotyaintsev, Y. V., Norgren, C., Vaivads, A., André, M., Toledo-Redondo, S., et al. (2017). Lower hybrid waves in the ion diffusion and magnetospheric inflow regions. J. Geophys. Res. Space Phys. 122, 517–533. doi:10.1002/2016JA023572

CrossRef Full Text | Google Scholar

Gruzinov, A., and Pogutse, O. (1986). Description of plasma turbulence in a strong magnetic field. Proc. USSR Acad. Sci. 290, 322–325.

CrossRef Full Text | Google Scholar

Guio, P., and Forme, F. (2006). Zakharov simulations of Langmuir turbulence: effects on the ion-acoustic waves in incoherent scattering. Phys. Plasmas. 13, 122902. doi:10.1063/1.2402145

CrossRef Full Text | Google Scholar

Guio, P., Børve, S., Daldorff, L. K. S., Lynov, J. P., Michelsen, P., Pécseli, H. L., et al. (2003). Phase space vortices in collisionless plasmas. Nonlinear Process Geophys. 10, 75–86. doi:10.5194/npg-10-75-2003

CrossRef Full Text | Google Scholar

Haerendel, G. (2019). Experiments with plasmas artificially injected into near-earth space. Front. Astron. Space Sci. 6, 29. doi:10.3389/fspas.2019.00029

CrossRef Full Text | Google Scholar

Hansen, F. R., Knorr, G., Lynov, J. P., Pécseli, H. L., and Rasmussen, J. J. (1989). A numerical plasma simulation including finite Larmor radius effects to arbitrary order. Plasma Phys. Contr. Fusion. 31, 173–183. doi:10.1088/0741-3335/31/2/003

CrossRef Full Text | Google Scholar

Hanssen, A., Mjølhus, E., DuBois, D. F., and Rose, H. A. (1992). Numerical test of the weak turbulence approximation to ionospheric Langmuir turbulence. J. Geophys. Res. 97, 12073–12091. doi:10.1029/92JA00874

CrossRef Full Text | Google Scholar

Hasegawa, A., and Mima, K. (1978). Pseudo-three-dimensional turbulence in magnetized nonuniform plasma. Phys. Fluids. 21, 87–92. doi:10.1063/1.862083

CrossRef Full Text | Google Scholar

Hasegawa, A., and Wakatani, M. (1983). Plasma edge turbulence. Phys. Rev. Lett. 50, 682–686. doi:10.1103/PhysRevLett.50.682

CrossRef Full Text | Google Scholar

Hassam, A. B., Hall, W., Huba, J. D., and Keskinen, M. J. (1986). Spectral characteristics of interchange turbulence. J. Geophys. Res. 91, 13513–13522. doi:10.1029/JA091iA12p13513

CrossRef Full Text | Google Scholar

Heisenberg, W. (1948). Zur statistischen Theorie der Turbulenz. Z. Phys. 124, 628–657. doi:10.1007/BF01668899

CrossRef Full Text | Google Scholar

Heisenberg, W., and Taylor, G. I. (1948). On the theory of statistical and isotropic turbulence. Proc. Math. Phys. Eng. Sci. 195, 402–406. doi:10.1098/rspa.1948.0127

CrossRef Full Text | Google Scholar

Horton, W. (1985). Ion acoustic turbulence and anomalous transport. J. Stat. Phys. 39, 739–754. doi:10.1007/BF01008363

CrossRef Full Text | Google Scholar

Horton, W. (1990). Nonlinear drift waves and transport in magnetized plasma. Phys. Rep. 192, 1–177. doi:10.1016/0370-1573(90)90148-U

CrossRef Full Text | Google Scholar

Høymork, S. H., Pécseli, H. L., Lybekk, B., Trulsen, J., and Eriksson, A. (2000). Cavitation of lower hybrid waves in the Earth’s ionosphere: a model analysis. J. Geophys. Res. 105, 18519–18536. doi:10.1029/2000JA900017

CrossRef Full Text | Google Scholar

Huba, J. D., Gladd, N. T., and Papadopoulos, K. (1978). Lower-hybrid-drift wave turbulence in the distant magnetotail. J. Geophys. Res. 83, 5217–5226. doi:10.1029/JA083iA11p05217

CrossRef Full Text | Google Scholar

Huba, J. D., Gladd, N. T., and Papadopoulos, K. (1977). The lower-hybrid-drift instability as a source of anomalous resistivity for magnetic field line reconnection. Geophys. Res. Lett. 4, 125–128. doi:10.1029/GL004i003p00125

CrossRef Full Text | Google Scholar

Hut, P. (2006). Virtual laboratories. Prog. Theor. Phys. Suppl. 164, 38–53. doi:10.1143/PTPS.164.38

CrossRef Full Text | Google Scholar

Iroshnikov, P. S. (1964). Turbulence of a conducting fluid in a strong magnetic field. Sov. Astron. Lett. 7, 566–571.

CrossRef Full Text | Google Scholar

Isham, B., Rietveld, M. T., Guio, P., Forme, F. R. E., Grydeland, T., and Mjølhus, E. (2012). Cavitating Langmuir turbulence in the terrestrial aurora. Phys. Rev. Lett. 108, 105003. doi:10.1103/PhysRevLett.108.105003

PubMed Abstract | CrossRef Full Text | Google Scholar

Iwama, N., Ohba, Y., and Tsukishima, T. (1979). Estimation of wave-number spectrum parameters from fixed probe-pair data. J. Appl. Phys. 50, 3197–3206. doi:10.1063/1.326356

CrossRef Full Text | Google Scholar

Jin, Y., Xiong, C., Clausen, L., Spicher, A., Kotova, D., Brask, S., et al. (2020). Ionospheric plasma irregularities based on in situ measurements from the Swarm satellites. J. Geophys. Res. Space Physics. 125, e2020JA028103. doi:10.1029/2020JA028103

CrossRef Full Text | Google Scholar

Johnsen, H., Pécseli, H. L., and Trulsen, J. (1987). Conditional eddies in plasma turbulence. Phys. Fluids. 30, 2239–2254. doi:10.1063/1.866158

CrossRef Full Text | Google Scholar

Johnson, J. R., Wing, S., and Delamere, P. A. (2014). Kelvin Helmholtz instability in planetary magnetospheres. Space Sci. Rev. 184, 1–31. doi:10.1007/s11214-014-0085-z

CrossRef Full Text | Google Scholar

Jovanović, D., Lynov, J. P., Michelsen, P., Pécseli, H. L., Rasmussen, J. J., and Thomsen, K. (1982). Three dimensional double layers in magnetized plasmas. Geophys. Res. Lett. 9, 1049–1052. doi:10.1029/GL009i009p01049

CrossRef Full Text | Google Scholar

Kadomtsev, B. B. (1965). Plasma turbulence. New York: Academic Press.

CrossRef Full Text | Google Scholar

Karpman, V., Hansen, F., Huld, T., Lynov, J., Pécseli, H., and Rasmussen, J. (1990). Nonlinear evolution of the modulational instability of whistler waves. Phys. Rev. Lett. 64, 890–893. doi:10.1103/PhysRevLett.64.890

PubMed Abstract | CrossRef Full Text | Google Scholar

Karpman, V. I., Istomin, J. N., and Shklyar, D. R. (1974). Nonlinear frequency shift and self-modulation of the quasi- monochromatic whistlers in the inhomogeneous plasma (magnetosphere). Planet. Space Sci. 22, 859–871. doi:10.1016/0032-0633(74)90155-X

CrossRef Full Text | Google Scholar

Kelley, M. C. (1989). The Earth’s ionosphere, plasma physics and electrodynamics. International geophysics series. San Diego, California: Academic Press, Vol. 43.

CrossRef Full Text | Google Scholar

Kim, Y. C., and Powers, E. J. (1978). Digital bispectral analysis of self-excited fluctuation spectra. Phys. Fluids. 21, 1452–1453. doi:10.1063/1.862365

CrossRef Full Text | Google Scholar

Kingsep, A. S., Chukbar, K. V., and Yan’kov, V. V. (1990). Electron magnetohydrodynamics. Review plasma physics. New York: Consultant Bureau, Chap. 3, Vol. 16, 243–291.

CrossRef Full Text | Google Scholar

Kingsep, A. S., Rudakov, L. I., and Sudan, R. N. (1973). Spectra of strong Langmuir turbulence. Phys. Rev. Lett. 31, 1482–1484. doi:10.1103/PhysRevLett.31.1482

CrossRef Full Text | Google Scholar

Kjus, S. H., Pécseli, H. L., Lybekk, B., Holtet, J., Trulsen, J., Lühr, H., et al. (1998). Statistics of the lower hybrid wave cavities detected by the FREJA satellite. J. Geophys. Res. 103, 26633–26647. doi:10.1029/98JA02245

CrossRef Full Text | Google Scholar

Knorr, G., Hansen, F. R., Lynov, J. P., Pécseli, H. L., and Rasmussen, J. J. (1988). Finite Larmor radius effects to arbitrary order. Phys. Scripta. 38, 829–834. doi:10.1088/0031-8949/38/6/014

CrossRef Full Text | Google Scholar

Kollmann, W. (2019). Navier-Stokes turbulence: theory and analysis. Switzerland: Springer.

CrossRef Full Text | Google Scholar

Kono, M., and Pécseli, H. L. (2016). Parametric decay of wide band Langmuir wave-spectra. J. Plasma Phys. 82, 905820606. doi:10.1017/S0022377816001070

CrossRef Full Text | Google Scholar

Kono, M., and Pécseli, H. L. (2017a). Stability of electron wave spectra in weakly magnetized plasmas. J. Plasma Phys. 83, 905830610. doi:10.1017/S0022377817000873

CrossRef Full Text | Google Scholar

Kono, M., and Pécseli, H. L. (2017b). Stability of electron wave spectra in weakly magnetized plasmas: local spectra and correlations. 1–12. doi:10.5281/zenodo.1035851

CrossRef Full Text | Google Scholar

Kono, M., and Škorić, M. M. (2010). “Nonlinear physics of plasmas. No. 62,” in Springer series on atomic, optical, and plasma physics. Heidelberg, Germany: Springer.

CrossRef Full Text | Google Scholar

Kontar, E. P. (2001). Dynamics of electron beams in the inhomogeneous solar corona plasma. Sol. Phys. 202, 131–149. doi:10.1023/A:1011894830942

CrossRef Full Text | Google Scholar

Kraichnan, R. H. (1965). Inertial-range spectrum of hydromagnetic turbulence. Phys. Fluids. 8, 1385–1387. doi:10.1063/1.1761412

CrossRef Full Text | Google Scholar

Kraichnan, R. H., and Montgomery, D. (1980). Two-dimensional turbulence. Rep. Prog. Phys. 43, 547–619. doi:10.1088/0034-4885/43/5/001

CrossRef Full Text | Google Scholar

Krane, B., Pécseli, H. L., Trulsen, J., and Primdahl, F. (2000). Spectral properties of low-frequency electrostatic waves in the ionospheric E region. J. Geophys. Res. 105, 10585–10601. doi:10.1029/1999JA900503

CrossRef Full Text | Google Scholar

Landahl, M. T., and Mollo-Christensen, E. (1992). Turbulence and random processes in fluid mechanics. 2nd Edn. Cambridge, UK: Cambridge University Press.

CrossRef Full Text | Google Scholar

Leslie, D. C. (1973). Developments in the theory of turbulence. Oxford: Oxford University Press.

CrossRef Full Text | Google Scholar

Li, J., Bortnik, J., An, X., Li, W., Angelopoulos, V., Thorne, R. M., et al. (2019). Origin of two-band chorus in the radiation belt of Earth. Nat. Commun. 10, 4672. doi:10.1038/s41467-019-12561-3

PubMed Abstract | CrossRef Full Text | Google Scholar

Lynov, J. P., Michelsen, P., Pécseli, H. L., Rasmussen, J. J., Saéki, K., and Turikov, V. A. (1979). Observations of solitary structures in a magnetized, plasma loaded waveguide. Phys. Scr. 20, 328–335. doi:10.1088/0031-8949/20/3-4/005

CrossRef Full Text | Google Scholar

Lyutikov, M. (2013). Electron magnetohydrodynamics: dynamics and turbulence. Phys. Rev. E. 88, 053103. doi:10.1103/PhysRevE.88.053103

CrossRef Full Text | Google Scholar

Ma, X., Delamere, P., Otto, A., and Burkholder, B. (2017). Plasma transport driven by the three-dimensional Kelvin-Helmholtz instability. J. Geophys. Res. Space Phys. 122 (10), 10382–10395. doi:10.1002/2017JA024394

CrossRef Full Text | Google Scholar

Machalek, M. D., and Nielsen, P. (1973). Light-scattering measurements of turbulence in a normal shock. Phys. Rev. Lett. 31, 439–442. doi:10.1103/PhysRevLett.31.439

CrossRef Full Text | Google Scholar

Mikkelsen, T., and Pécseli, H. L. (1980). Strong turbulence in partially ionized plasmas. Phys. Lett. 77, 159–162. doi:10.1016/0375-9601(80)90179-6

CrossRef Full Text | Google Scholar

Misguich, J. H., Balescu, R., Pécseli, H. L., Mikkelsen, T., Larsen, S. E., and Xiaoming, Q. (1987). Diffusion of charged particles in turbulent magnetoplasmas. Plasma Phys. Contr. Fusion. 29, 825–856. doi:10.1088/0741-3335/29/7/004

CrossRef Full Text | Google Scholar

Morley, S. K. (2020). Challenges and opportunities in magnetospheric space weather prediction. Space Weather. 18, e2018SW002108. doi:10.1029/2018SW002108

CrossRef Full Text | Google Scholar

Morse, R. L., and Nielson, C. W. (1969). One-, two-, and three-dimensional numerical simulation of two-beam plasmas. Phys. Rev. Lett. 23, 1087–1090. doi:10.1103/PhysRevLett.23.1087

CrossRef Full Text | Google Scholar

Musher, S. L., and Sturman, B. I. (1975). Collapse of plasma waves near the lower hybrid resonance. JETP Lett. 22, 265–267.

CrossRef Full Text | Google Scholar

Nakamura, S., Omura, Y., and Summers, D. (2018). Fine structure of whistler mode hiss in plasmaspheric plumes observed by the van Allen probes. J. Geophys. Res. Space Physics. 123, 9055–9064. doi:10.1029/2018JA025803

CrossRef Full Text | Google Scholar

Nicholson, D. R. (1983). Introduction to plasma theory. New York: John Wiley & Sons.

CrossRef Full Text | Google Scholar

Novikov, E. A. (1990). The effects of intermittency on statistical characteristics of turbulence and scale similarity of breakdown coefficients. Phys. Fluid. Fluid Dynam. 2, 814–820. doi:10.1063/1.857629

CrossRef Full Text | Google Scholar

Oppenheim, M., Otani, N., and Ronchi, C. (1996). Saturation of the Farley-Buneman instability via nonlinear electron E×B drifts. J. Geophys. Res. 101, 17273–17286. doi:10.1029/96JA01403

CrossRef Full Text | Google Scholar

Orszag, S. A., and Kraichnan, R. H. (1967). Model equations for strong turbulence in a Vlasov plasma. Phys. Fluids. 10, 1720–1736. doi:10.1063/1.1762351

CrossRef Full Text | Google Scholar

Ott, E., and Farley, D. T. (1974). The spectrum of ionospheric irregularities. J. Geophys. Res. 79, 2469–2472. doi:10.1029/JA079i016p02469

CrossRef Full Text | Google Scholar

Papadopoulos, K. (1977). A review of anomalous resistivity for the ionosphere. Rev. Geophys. 15, 113–127. doi:10.1029/RG015i001p00113

CrossRef Full Text | Google Scholar

Partamies, N., Donovan, E., and Knudsen, D. (2008). Statistical study of inverted-V structures in FAST data. Ann. Geophys. 26, 1439–1449. doi:10.5194/angeo-26-1439-2008

CrossRef Full Text | Google Scholar

Pécseli, H. L. (2016). Low frequency waves and turbulence in magnetized laboratory plasmas and in the ionosphere. United Kingdom: IOP Publishing.

CrossRef Full Text | Google Scholar

Pécseli, H. L. (2014). Modulational stability of electron plasma wave spectra. J. Plasma Phys. 80, 745–769. doi:10.1017/S002237781400035X

CrossRef Full Text | Google Scholar

Pécseli, H. L. (2015). Spectral properties of electrostatic drift wave turbulence in the laboratory and the ionosphere. Ann. Geophys. 33, 875–900. doi:10.5194/angeo-33-875-2015

CrossRef Full Text | Google Scholar

Pécseli, H. L., and Trulsen, J. (2006). “Tests of time evolutions in deterministic models by random sampling of space plasma phenomena,” in Geospace electromagnetic waves and radiation. Lecture notes in physics. Berlin: Springer, Chap. 11, Vol. 687, 273–296.

CrossRef Full Text | Google Scholar

Pécseli, H. L., Iranpour, K., Holter, Ø., Lybekk, B., Holtet, J., Trulsen, J., et al. (1996). Lower hybrid wave cavities detected by the FREJA satellite. J. Geophys. Res. 101, 5299–5316. doi:10.1029/95JA03127

CrossRef Full Text | Google Scholar

Pécseli, H. L., Lybekk, B., Trulsen, J., and Eriksson, A. (1997). Lower-hybrid wave cavities detected by instrumented spacecrafts. Plasma Phys. Contr. Fusion. 39, A227. doi:10.1088/0741-3335/39/5A/021

CrossRef Full Text | Google Scholar

Pécseli, H. L., Trulsen, J., and Armstrong, R. J. (1984). Formation of ion phase-space vortexes. Phys. Scr. 29, 241–253. doi:10.1088/0031-8949/29/3/010

CrossRef Full Text | Google Scholar

Post, D. E., and Votta, L. G. (2005). Computational science demands a new paradigm. Phys. Today. 58, 35–41. doi:10.1063/1.1881898

CrossRef Full Text | Google Scholar

Primdahl, F. (1986). Polar ionospheric E-region plasma wave stabilization and electron heating by wave-induced enhancement of the electron collision frequency. Phys. Scripta. 33, 187–191. doi:10.1088/0031-8949/33/2/017

CrossRef Full Text | Google Scholar

Rasmussen, J. J., and Rypdal, K. (1986). Blow-up in nonlinear Schroedinger equations-I A general review. Phys. Scr. 33, 481–497. doi:10.1088/0031-8949/33/6/001

CrossRef Full Text | Google Scholar

Ratcliffe, H., Brady, C. S., Che Rozenan, M. B., and Nakariakov, V. M. (2014). A comparison of weak-turbulence and particle-in-cell simulations of weak electron-beam plasma interaction. Phys. Plasmas. 21, 122104. doi:10.1063/1.4904065

CrossRef Full Text | Google Scholar

Robinson, P. A. (1997). Nonlinear wave collapse and strong turbulence. Rev. Mod. Phys. 69, 507–574. doi:10.1103/RevModPhys.69.507

CrossRef Full Text | Google Scholar

Saeki, K., Michelsen, P., Pécseli, H. L., and Rasmussen, J. J. (1979). Formation and coalescence of electron solitary holes. Phys. Rev. Lett. 42, 501–504. doi:10.1103/PhysRevLett.42.501

CrossRef Full Text | Google Scholar

Sakanaka, P. H. (1972). Beam-generated collisionless ion-acoustic shocks. Phys. Fluids. 15, 1323–1327. doi:10.1063/1.1694084

CrossRef Full Text | Google Scholar

Sato, H., Jakowski, N., Berdermann, J., Jiricka, K., Heßelbarth, A., Banyś, D., et al. (2019). Solar radio burst events on 6 September 2017 and its impact on GNSS signal frequencies. Space Weather. 17, 816–826. doi:10.1029/2019SW002198

CrossRef Full Text | Google Scholar

Sato, N., Hatakeyama, R., Iizuka, S., Mieno, T., Saeki, K., Rasmussen, J. J., et al. (1981). Ultrastrong stationary double layers in a nondischarge magnetoplasma. Phys. Rev. Lett. 46, 1330–1333. doi:10.1103/PhysRevLett.46.1330

CrossRef Full Text | Google Scholar

Schamel, H. (1986). Electron holes, ion holes and double layers. Phys. Rep. 140, 161–191. doi:10.1016/0370-1573(86)90043-8

CrossRef Full Text | Google Scholar

Schlegel, K., and St.-Maurice, J. P. (1981). Anomalous heating of the polar E region by unstable plasma waves 1. Observations. J. Geophys. Res. 86, 1447–1452. doi:10.1029/JA086iA03p01447

CrossRef Full Text | Google Scholar

Schuck, P. W., Bonnell, J. W., and Kintner, P. M. (2003). A review of lower hybrid solitary structures. IEEE Trans. Plasma Sci. 31, 1125–1177. doi:10.1109/TPS.2003.822043

CrossRef Full Text | Google Scholar

Schuck, P. W., Bonnell, J. W., and Pinçon, J.-L. (2004). Properties of lower hybrid solitary structures: a comparison between space observations, a laboratory experiment, and the cold homogeneous plasma dispersion relation. J. Geophys. Res. Space Phys. 109, A01310. doi:10.1029/2002JA009673

CrossRef Full Text | Google Scholar

Shapiro, V. D., Shevchenko, V. I., Solov’ev, G. I., Kalinin, V. P., Bingham, R., Sagdeev, R. Z., et al. (1993). Wave collapse at the lower‐hybrid resonance. Phys. Fluids, Plasma Phys. 5, 3148–3162. doi:10.1063/1.860652

CrossRef Full Text | Google Scholar

Shawhan, S. D. (1979). “Magnetospheric plasma waves,” in Solar system plasma physics. Amsterdam: North-Holland Publishing Company, Chap. III.1.6, Vol. 54, 213–270.

CrossRef Full Text | Google Scholar

Shawhan, S. D. (1985). The menagerie of geospace plasma waves. Space Sci. Rev. 42, 257–274. doi:10.1007/BF00218235

CrossRef Full Text | Google Scholar

Shkarofsky, I. P. (1969). “Analytic forms for decaying turbulence functions,” in Turbulence in fluids and plasmas. Microwave research institute symposia series. Brooklyn, N. Y., USA: Polytechnic Press, Chap. 21, Vol. XVIII, 289–301.

CrossRef Full Text | Google Scholar

Similon, P. L., and Sudan, R. N. (1990). Plasma turbulence. Annu. Rev. Fluid Mech. 22, 317–347. doi:10.1146/annurev.fl.22.010190.001533

CrossRef Full Text | Google Scholar

Sotnikov, V. I., Shapiro, V. D., and Shevchenko, V. I. (1978). Macroscopic consequences of collapse at the lower hybrid resonance. Sov. J. Plasma Phys. 4, 252–257.

CrossRef Full Text | Google Scholar

Sreenivasan, K. R. (1995). On the universality of the Kolmogorov constant. Phys. Fluids. 7, 2778–2784. doi:10.1063/1.868656

CrossRef Full Text | Google Scholar

Stenzel, R. L. (1999). Whistler waves in space and laboratory plasmas. J. Geophys. Res. 104, 14379–14395. doi:10.1029/1998JA900120

CrossRef Full Text | Google Scholar

Stenzel, R. L. (2016). Whistler waves with angular momentum in space and laboratory plasmas and their counterparts in free space. Adv. Phys. X. 1, 687–710. doi:10.1080/23746149.2016.1240017

CrossRef Full Text | Google Scholar

Sudan, R. N. (1983). Unified theory of Type I and Type II irregularities in the equatorial electrojet. J. Geophys. Res. 88, 4853–4860. doi:10.1029/JA088iA06p04853

CrossRef Full Text | Google Scholar

Sudan, R. N., and Keskinen, M. (1977). Theory of strongly turbulent two-dimensional convection of low-pressure plasma. Phys. Rev. Lett. 38, 966–970. doi:10.1103/PhysRevLett.38.966

CrossRef Full Text | Google Scholar

Sulem, C., Sulem, P.-L., and Frisch, H. (1983). Tracing complex singularities with spectral methods. J. Comput. Phys. 50, 138–161. doi:10.1016/0021-9991(83)90045-1

CrossRef Full Text | Google Scholar

Taylor, G. I. (1938). The spectrum of turbulence. Proc. R. Soc. A. 164, 476–490. doi:10.1098/rspa.1938.0032

CrossRef Full Text | Google Scholar

Tchen, C. M., Pécseli, H. L., and Larsen, S. E. (1980). Strong turbulence in low-β plasmas. Plasma Phys. 22, 817–829. doi:10.1088/0032-1028/22/8/005

CrossRef Full Text | Google Scholar

Teliban, I., Block, D., Piel, A., and Greiner, F. (2007). Improved conditional averaging technique for plasma fluctuation diagnostics. Plasma Phys. Contr. Fusion. 49, 485–497. doi:10.1088/0741-3335/49/4/011

CrossRef Full Text | Google Scholar

Tennekes, H., and Lumley, J. L. (1972). A first course in turbulence. Cambridge, Massachusetts: MIT Press.

CrossRef Full Text | Google Scholar

Thornhill, S. G., and ter Haar, D. (1978). Langmuir turbulence and modulational instability. Phys. Rep. 43, 43–99. doi:10.1016/0370-1573(78)90142-4

CrossRef Full Text | Google Scholar

Tong, Y., Vasko, I., Mozer, F. S., Bale, S. D., Roth, I., Artemyev, A., et al. (2018). Simultaneous multispacecraft probing of electron phase space holes. Geophys. Res. Lett. 45, 11513–11519. doi:10.1029/2018GL079044

CrossRef Full Text | Google Scholar

Vierinen, J., Gustavsson, B., Hysell, D. L., Sulzer, M. P., Perillat, P., and Kudeki, E. (2017). Radar observations of thermal plasma oscillations in the ionosphere. Geophys. Res. Lett. 44, 5301–5307. doi:10.1002/2017GL073141

CrossRef Full Text | Google Scholar

Vladimirov, S. V., and Stenflo, L. (1997). Three-wave processes in a turbulent nonstationary plasma. Phys. Plasmas. 4, 1249–1256. doi:10.1063/1.872297

CrossRef Full Text | Google Scholar

von Alfthan, S., Pokhotelov, D., Kempf, Y., Hoilijoki, S., Honkonen, I., Sandroos, A., et al. (2014). Vlasiator: first global hybrid-Vlasov simulations of Earth's foreshock and magnetosheath. J. Atmos. Sol. Terr. Phys. 120, 24–35. doi:10.1016/j.jastp.2014.08.012

CrossRef Full Text | Google Scholar

Walker, S. N., Balikhin, M. A., Alleyne, H. S. C. K., Hobara, Y., André, M., and Dunlop, M. W. (2008). Lower hybrid waves at the shock front: a reassessment. Ann. Geophys. 26, 699–707. doi:10.5194/angeo-26-699-2008

CrossRef Full Text | Google Scholar

Wang, R., Vasko, I. Y., Mozer, F. S., Bale, S. D., Artemyev, A. V., Bonnell, J. W., et al. (2020). Electrostatic turbulence and Debye-scale structures in collisionless shocks. Acta Pathol. Jpn. 889, L9. doi:10.3847/2041-8213/ab6582

CrossRef Full Text | Google Scholar

Wyngaard, J. C., and Clifford, S. F. (1977). Taylor’s hypothesis and high-frequency turbulence spectra. J. Atmos. Sci. 34, 922–929. doi:10.1175/1520-0469(1977)034<0922:THAHTS>2.0.CO;2

CrossRef Full Text | Google Scholar

Yeh, K. C., and Liu, C. H. (1972). Theory of ionospheric waves. International geophysics series. New York, London: Academic Press, Vol. 17.

CrossRef Full Text | Google Scholar

Young, M. A., Oppenheim, M. M., and Dimant, Y. S. (2020). The Farley-Buneman spectrum in 2-D and 3-D particle-in-cell simulations. J. Geophys. Res. Space Phys. 125, e2019JA027326. doi:10.1029/2019JA027326

CrossRef Full Text | Google Scholar

Zakharov, V. E. (1972). Collapse of Langmuir waves. Sov. Phys.-JETP., 35, 908–914.

CrossRef Full Text | Google Scholar

Zhang, W., Ni, B., Huang, H., Summers, D., Fu, S., Xiang, Z., et al. (2019). Statistical properties of hiss in plasmaspheric plumes and associated scattering losses of radiation belt electrons. Geophys. Res. Lett. 46, 5670–5680. doi:10.1029/2018GL081863

CrossRef Full Text | Google Scholar

Keywords: plasma, turbulence, ionosphere, anomalous resistivity, nonlinear waves, diffusion

Citation: Guio P and Pécseli HL (2021) The Impact of Turbulence on the Ionosphere and Magnetosphere. Front. Astron. Space Sci. 7:573746. doi: 10.3389/fspas.2020.573746

Received: 17 June 2020; Accepted: 30 November 2020;
Published: 25 January 2021.

Edited by:

Vadim Uritsky, The Catholic University of America, United States

Reviewed by:

Giuseppe Consolini, Institute for Space Astrophysics and Planetology (INAF), Italy
Nickolay Ivchenko, Royal Institute of Technology, Sweden
Arnaud Masson, European Space Astronomy Centre (ESAC), Spain

Copyright © 2021 Guio and Pécseli. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

*Correspondence: Hans L. Pécseli, hans.pecseli@fys.uio.no

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