磁层中哨声波与电子的相互作用

哨声波与磁层中电子的非线性相互作用,导致电子投掷角降低,沉降到低电离层,引起局部电离增强,而诱发Trimpi效应。本文讨论波-粒子相互作用的过程,并利用超粒子法进行了计算机模拟。计算结果指出共振不仅与电子的速度有关,而且与电子初始拉莫尔相位角有关;计算得到了相互作用时共振电子相位聚焦效应、非共振电子相位聚束效应及电子速度-相位空间中的不均匀振荡等一些结果。同时,也给出了波-电子相互作用引起的沉降电子能量通量随时间的变化和沉降电子的能量分布。 

INTERACTION BETWEEN WHISTLER MODE WAVE AND THE ELECTRONS IN THE MAGNETOSPHERE

Nonlinear interaction between the whistle mode wave and the electrons in the magneto-sphere reduces the electron's pitch angle and makes some electrons precipitating into the ionosphere,which enhances the local ionization and induces Trimpi Effects.In this paper the equations governing the wave-particle interaction are given and the Super Particle Mode,Long-Time-Scale-Method are used to simulate this nonlinear process.The results of the simulation are as following: (1) When the electrons meet the whistler wave,there occur the phase focus of resonance electrons and phase bunching of unresonance electrons.The resonance electron oscillate asymmetrically in he space (-4)-μ during the interaction.(2) The inhomogeneity of the earth magnetic field causes the shift of center angle of trapped region and has influences on the whistler wave trapping electrons.(3) This paper also gives the curves of energy flux of the electron precipitation with time at the altitude of 1000 km above the earth and the curves of energy distribution of the precipitating electrons.