[P-EM16] Dynamics of Earth's Inner Magnetosphere and Initial Results from Arase

[PEM16-01] Energetic electron acceleration and precipitations associated with chorus waves; Arase observations

*三好 由純¹、齊藤 慎司¹、栗田 怜¹、笠原 禎也²、松田 昇也¹、土屋 史紀³、熊本 篤志³、松岡 彩子⁴、東尾 奈々⁴、三谷 烈史⁴、高島 健⁴、笠原 慧⁵、横田 勝一郎⁶、浅村 和史⁴、篠原 育⁴、塩川 和夫¹、小川 泰信⁷、細川 敬祐⁸、大山 伸一郎¹、堀 智昭¹、小路 真史¹、寺本 万里子¹、Chang Tzu-Fang¹、Turunen Esa⁹ (1.名古屋大学宇宙地球環境研究所、2.金沢大学、3.東北大学、4.宇宙航空研究開発機構、5.東京大学、6.大阪大学、7.国立極地研究所、8.電気通信大学、9.サダンキラ地球物理学研究所)

キーワード：放射線帯、粒子消失、波動粒子相互作用

The whistler mode chorus waves work dual role for the acceleration and precipitation of energetic electrons. The Arase satellite that was launched in December, 2016 has obtained comprehensive data sets for plasma/particles and fields/waves. In March and April, 2017, the Arase satellite observed several magnetic disturbances driven by CIR and subsequent coronal hole streams. During the period, the Arase satellite observed continuous chorus activities for a few days associated with the high-speed solar wind. During this period, comprehensive observations from the Arase satellite and ground-based observations are realized. EISCAT at Tromso, Norway observed strong ionization at the low altitude, indicating sub-relativistic electrons of the radiation belts precipitate into the atmosphere. During the period, the Arase satellite successfully observed intense chorus waves outside the plasmapause, indicating the resonance with chorus waves causes the pitch angle scattering of energetic electrons. Simultaneously, large flux enhancement of the outer belt electrons was observed with enhancement of chorus waves. We discuss the dual role that chorus waves play in controlling the dynamics of the radiation belts.