日本地球惑星科学連合2019年大会

講演情報

[E] 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] 内部磁気圏

2019年5月29日(水) 17:15 〜 18:30 ポスター会場 (幕張メッセ国際展示場 8ホール)

コンビーナ:海老原 祐輔(京都大学生存圏研究所)、Danny Summers(Memorial University of Newfoundland)、三好 由純(名古屋大学宇宙地球環境研究所)、齊藤 慎司(名古屋大学 大学院理学研究科)

[PEM13-P08] Two-dimensional simulation of whistler mode wave packets interacting with energetic electrons

*野儀 武志1大村 善治1 (1.京都大学 生存圏研究所)

We perform two-dimensional electromagnetic particle simulations to study basic characteristics of whistler-mode wave particle interaction involved in the generation and propagation processes of chorus emissions with wave normal angles oblique to the static magnetic field. We assume a simple periodic (x, y) system with the magnetic field taken in the x-direction. We find the linear phase of the instability is much affected by electrostatic thermal fluctuations. It is necessary to put many super-particles in a grid cell to suppress the thermal fluctuation. We next put an array of antennas perpendicular to the background magnetic field, and oscillate the antenna current to generate obliquely propagating waves. In addition to the nonlinear trapping of energetic electrons through the cyclotron resonance, another nonlinear trapping of electrons takes place through the Landau resonance. Structures of the nonlinear trapping potentials change with the varying frequency, affecting efficiency of energy transfer between the wave and energetic electrons. We study nonlinear evolution of the wave packet, and competing processes of both resonances in accelerating energetic electrons to higher energies.