Observational and numerical studies about frequency chirping of chorus waves

Xin Tao; Shanchun Teng

講演情報

[EE] 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-EM16] [EE] Physics of Inner Magnetosphere Coupling

2017年5月24日(水) 09:00 〜 10:30 A02 (東京ベイ幕張ホール)

コンビーナ:Danny Summers(Memorial University of Newfoundland)、Jichun Zhang(University of New Hampshire Main Campus)、海老原祐輔(京都大学生存圏研究所)、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)、Aleksandr Y Ukhorskiy(Johns Hopkins University Applied Physics Laboratory)、Dae-Young Lee(Chungbuk Natl Univ)、Yiqun Yu(Beihang University)、三好由純(名古屋大学宇宙地球環境研究所)、座長:Zhang Jichun(University of New Hampshire Main Campus)

09:15 〜 09:30

[PEM16-20] Observational and numerical studies about frequency chirping of chorus waves

★招待講演

*Xin Tao¹、Shanchun Teng¹ (1.University of Science and Technology of China)

キーワード：chorus waves, frequency sweep rate

The underlying physical mechanism of the nonlinear frequency chirping of whistler mode chorus waves has been investigated for more than fifty years; nevertheless, a consensus has yet to be reached. In this talk, we will present some of our recent observational studies about the dependence of the chorus wave frequency chirping rate on both background plasma parameters and wave amplitude. Comparison with different previously published theoretical models will be given. We will also present numerical simulation demonstrating the amplitude modulation of chorus waves that has also been found in observation. With phase space diagnostics, we suggest that the amplitude modulation is caused by phase space trapping of resonant particles.