日本地球惑星科学連合2022年大会

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[E] 口頭発表

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-EM11] Dynamics of the Inner Magnetospheric System

2022年5月25日(水) 09:00 〜 10:30 303 (幕張メッセ国際会議場)

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)、コンビーナ:三好 由純(名古屋大学宇宙地球環境研究所)、Blum Lauren W(University of Colorado Boulder)、コンビーナ:Shprits Yuri(Helmholtz Centre Potsdam GFZ German Research Centre for Geosciences)、座長:松田 昇也(金沢大学)、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)


10:00 〜 10:15

[PEM11-04] Variations of the relativistic electrons of the outer belt and plasmasphere during the solar declining and minimum phase: Arase observations

*三好 由純1栗田 怜2片岡 龍峰3今城 峻2堀 智昭1中村 紗都子1寺本 万里子4三谷 烈史5篠原 育5浅村 和史5高島 健5、東尾 奈々5土屋 史紀6熊本 篤志6松田 昇也7笠原 禎也7松岡 彩子2 (1.名古屋大学宇宙地球環境研究所、2.京都大学、3.国立極地研究所、4.九州工業大学、5.宇宙航空研究開発機構、6.東北大学、7.金沢大学)

キーワード:あらせ衛星、放射線帯、プラズマ圏

The Arase satellite has observed the inner magnetosphere from 2017 to present, which covers the declining phase and the minimum of the cycle 24 and the early rising phase of the cycle 25. Since past inner magnetosphere satellites near the equator did not cover the transition phase of two cycles, the Arase satellite has provided the unique data set of the outer belt as well as the plasmasphere. During the declining phase, the Arase satellite observed the outer belt variations associated with many coronal hole streams and several CME-driven storms. The semi-annual variations of the outer belt due to the Russel-McPherron effects are observed. The growing peak of the phase space density are observed in the heart of the outer belt and outside the plasmapause in average, which suggests that the internal acceleration process mainly works for the flux enhancements. In the early cycle 25, the Arase satellite observed the ground-minimum of the outer belt in which the flux of the MeV electrons is almost empty for a few months, and then the satellite observed significant enhancements of the outer belt associated with the storm activities of the cycle 25.