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ORIGINAL RESEARCH article
Front. Astron. Space Sci.
Sec. Space Physics
Volume 12 - 2025 | doi: 10.3389/fspas.2025.1383946
This article is part of the Research Topic Variability in the Solar Wind and its Impact on the Coupled Magnetosphere-Ionosphere-Thermosphere System View all 11 articles
The SDEMMA Model for Galactic Cosmic Ray and Its Dosimetric Application
Provisionally accepted- Shandong Institute of Advanced Technology, Chinese Academy of Sciences, Jinan, Shandong Province, China
The future manned mission to Mars will face significantly higher levels of radiation than missions in low Earth orbit. Here, we introduce a model of galactic cosmic rays (GCRs): the Space-Dependent Energetic cosmic ray Modulation using MAgnetic spectrometer (SDEMMA) model, that covers various locations within the inner heliosphere from 2006 to 2019 currently. It consistently provides time-dependent GCR spectra for all Z = 1 -28 elements above a rigidity of 0.2 GV. We employ the stochastic differential equation calculation method, and local interstellar spectrum from some recently developed models as its outer boundary conditions. The time-dependent diffusion and drift parameters are fitted by the Markov Chain Monte Carlo method to data obtained from spaceborne magnetic spectrometers of AMS-02 and PAMELA. In this model, we explicitly extend the calculation of GCR spectra to radial positions beyond 1.0 AU, and focus on the radial gradient in various conditions. To demonstrate its application, we have calculated the space-time dependent dose equivalent rates induced by such modulated GCR model, which are 14 -17 cSv/yr behind a 30 g/cm 2 polyethylene shielding at a flux minimum, depending the quality factor definition.
Keywords: galactic cosmic ray, Solar modulation, stochastic differential equation, spatial dependence, Fluence-to-dose conversion coefficient, Dose equivalent rate
Received: 08 Feb 2024; Accepted: 11 Mar 2025.
Copyright: © 2025 Song, Huo, Xu, Chen and Luo. 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) or licensor 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:
Ran Huo, Shandong Institute of Advanced Technology, Chinese Academy of Sciences, Jinan, Shandong Province, China
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