[P-EM13] Dynamics of the Inner Magnetospheric System

[PEM13-17] Electron Precipitation driven by Chorus Wave in the Earth’s inner magnetosphere

*Xueyi Wang¹、Huayue Chen¹、Lunjin Chen、Yoshiharu Omura、Yikai Hsieh (1.Auburn University)

キーワード：chorus wave, particle simulation, electron precipitation

Particle precipitation is a significant energy input into the Earth’s ionosphere and plays an important role in magnetosphere-ionosphere coupling. Previous studies employed test particle simulations to investigate wave-particle interaction and associated precipitation, in which the wave evolution is presumed and the particle feedback to waves is neglected. In this study, we employ a self-consistent simulation model, GCPIC (the general curvilinear plasma simulation code), to investigate particle precipitation in a dipole magnetic field. It is found that the quasi-periodic, energy-dispersive electron precipitation is driven by chorus waves, with the electron precipitation period aligning with that of chorus waves. Moreover, the fine structures within the precipitation spectrogram are identified, and are consistent with the high-frequency modulation of precipitation in observation. The chorus wave modulated by ULF wave and background plasma density and associated electron “on” and “off” precipitation has been investigated.