AUTHOR=Zhang Qiang , Han De-Sheng , Teng Shang-Chun , Wang Zhi-Wei , Zhang Q.-H. , Xing Zan-Yang , Wang Yong , Ma Yu-Zhang 

TITLE=A statistical analysis and comparison of the fine structures of the ion upflow associated with the double-peak subauroral ion drift

JOURNAL=Frontiers in Astronomy and Space Sciences

VOLUME=Volume 10 - 2023

YEAR=2023

URL=https://www.frontiersin.org/journals/astronomy-and-space-sciences/articles/10.3389/fspas.2023.1254243

DOI=10.3389/fspas.2023.1254243

ISSN=2296-987X

ABSTRACT=The ion upflow associated with subauroral ion drift (SAID) is a crucial component in the exchange of particles between the ionosphere and the ring currents. The ion upflow associated with double-peak subauroral ion drift (DSAID), which is a subclass of SAID, is more complex compared to SAID. In this study, we conducted a statistical analysis of the ion upflow associated with DSAID using DMSP f16-f18 data for 11 years (2010-2020) in the Northern Hemisphere. Our findings revealed that DSAID can exhibit both double-peak and one peak upflow. The statistical characteristics of these two types of events displayed significant differences. In DSAID with double-peak upflow event, the velocity of DSAID around the high latitude peak was greater than that around the low latitude peak. However, in DSAID with one peak upflow event, the DSAID velocities around the two peaks were very similar. Based on the formation mechanism of DSAID and the process of frictional heating in the ionosphere, we proposed that the formation of DSAID with double-peak upflow and DSAID with one peak upflow are likely related to the formation process of DSAID.