日本地球惑星科学連合2023年大会

講演情報

[E] オンラインポスター発表

セッション記号 P (宇宙惑星科学) » P-EM 太陽地球系科学・宇宙電磁気学・宇宙環境

[P-EM13] Dynamics of the Inner Magnetospheric System

2023年5月23日(火) 09:00 〜 10:30 オンラインポスターZoom会場 (1) (オンラインポスター)

コンビーナ:桂華 邦裕(東京大学大学院理学系研究科地球惑星科学専攻)、三好 由純(名古屋大学宇宙地球環境研究所)、Theodore E Sarris(Democritus University of Thrace)、Evan G Thomas(Dartmouth College)

現地ポスター発表開催日時 (2023/5/23 17:15-18:45)

09:00 〜 10:30

[PEM13-P13] Electron Dynamic Modeling during Dipolarization Substorm Events by Test Particle Simulations

*Kirolosse Mina Girgis1Tohru Hada2,1Kaiti Wang3Fumiko Otsuka2Akimasa Yoshikawa1,4 (1.International Research Center for Space and Planetary Environmental Science, Kyushu University, Japan、2.Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Japan、3.Tamkang University, Taiwan、4.Department of Earth and Planetary Sciences, Kyushu University, Japan)

キーワード:Dipolarization, Substorm, Electron Dynamics, Test Particle Simulations

We developed a test particle simulation code to examine the electron dynamics during multiple dipolarization substorm events detected by the THEMIS mission. Through the Tao-Chan-Brizard guiding center model, we evaluated the trajectories of 0.1, 1, and 10 keV electrons with different initial pitch angles and L-shells. We applied the Tsyganenko model TS05 and the IGRF-12 to generate the time-varying magnetic field model with the corresponding inductive and polarized electric fields.
Our preliminary simulation showed that the particle flux and energy increase were enhanced in the nighttime magnetosphere during dipolarization events. Our simulation results suggest that the increase in the magnetic field in the dipolarization event and the corresponding induced/polarized electric field energizes and transports the particles earthward, which may explain the mechanism of the particle flux enhancement in the inner magnetosphere.