Impacts of Ionospheric Conductance on Magnetosphere‐Ionosphere Coupling

作者：Jing Liu, Wenbin Wang, Liying Qian, Kevin Pham, Libo Liu, Qiaoling Li, Shuhan Li, Xuanqing Liu · 发表于：Journal of Geophysical Research Space Physics · 年份：2023 · DOI：10.1029/2022ja030864 · 被引用次数：11 · 研究领域：Ionosphere and magnetosphere dynamics、Solar and Space Plasma Dynamics、Earthquake Detection and Analysis

Abstract Understanding the consequence of the complex interplay between solar flare and geomagnetic storm on the magnetosphere‐ionosphere (M‐I) coupling is a critical aspect to space weather research. This is the first attempt to simulate the concurrent solar flare and geomagnetic storm effects on M‐I coupling using the state‐of‐art geospace model which integrates Lyon‐Fedder‐Mobarry ‐Thermosphere‐Ionosphere‐Electrodynamics General Circulation Model —the Rice Convection ring current Model (LTR) in a self‐consistent way. Our results indicate that dayside E‐region electron density enhancements peak nearly at the same time as the flare and these electron density enhancements at middle latitudes are not very sensitive to storm forcing. F‐region electron densities also have an immediate response to solar flares but take longer to recover compared to E‐region ionosphere, and dayside F‐region electron density enhancements are more prominent for more stormy conditions. These dayside middle‐latitude F‐region enhancements intensify tongue of ionization in the polar cap region. Both E‐ and F‐region electron density increases contribute to polar ionosphere conductance enhancements that have both local and global consequences. Flare‐induced conductance enhancements tend to reduce the amount of Joule dissipation into upper atmosphere and cross polar cap potential around solar flare peak (12:00 UT), and increase dayside field aligned currents and Joule dissipation afterward (12:20–13:30 UT)...