[P-EM13] Dynamics of the Inner Magnetospheric System

[PEM13-14] Average Profiles of Outer Radiation Belt Electron Flux and Related Plasma Parameters During Magnetic Storms: Insights from Arase Observations and Simulations

*三好 由純¹、Kumar Sandeep²、栗田 怜³、齊藤 慎司⁴、松田 昇也⁵、加藤 雄人⁶、片岡 龍峰⁷、Chen Rui⁸、Radhakrishna Shreedevi ¹、篠原 育⁹、浅村 和史⁹、風間 洋一¹⁰、Wang Shiang-Yu¹⁰、Jun Chae-Woo¹、堀 智昭¹、笠原 慧¹¹、横田 勝一郎¹²、桂華 邦裕¹¹、三谷 烈史⁹、高島 健⁹、東尾 奈々⁹、笠原 禎也⁵、土屋 史紀¹³、熊本 篤志¹³、新堀 淳樹¹、北村 成寿¹、松岡 彩子³、山本 和弘¹、寺本 万里子¹³ (1.名古屋大学宇宙地球環境研究所、2.NASA/GSFC、3.京都大学、4.情報通信研究機構、5.金沢大学、6.東北大学、7.国立極地研究所、8.Auburn大学、9.宇宙航空研究開発機構、10.ASIAA、11.東京大学、12.大阪大学、13.九州工業大学)

キーワード：あらせ衛星、内部磁気圏、放射線帯、波動粒子相互作用

The Arase satellite has successfully observed the inner magnetosphere for over eight years, providing continuous data on a wide range of electron energy and various plasma waves. We conducted a superposed epoch analysis of electrons at different energies, including source and seed populations, as well as plasma density and plasma waves. The result was sorted as a function of L-shell, magnetic local time (MLT), and storm phase to identify the average variations in these key parameters that contribute to the acceleration of relativistic electrons in the outer radiation belt. The results are consistent with the concept of cross-energy coupling, in which wave-particle interactions play a crucial role. In particular, prolonged substorm activities that drive continuous chorus waves through hot electron flux enhancements are essential for the buildup of relativistic electrons via wave-particle interactions. We also compare these findings with data-driven simulations of the evolution of the electron energy spectrum to discuss potential acceleration mechanisms.