Storm-Time Evolution of Energetic Electron Pitch Angle Distributions by Wave-Particle Interaction

• 作 者: 肖伏良 贺慧勇 周庆华 伍冠洪 史向华
• 机 构: School of Physics and Electronic Sciences, Changsha University of Science and Technology, Changsha 4
• 出 处: Plasma Science and Technology
• 发表日期: 2008年01期
• 关键词: Pitch interpretation storm energetic pitch Electron Angle Release perhaps spacec

The quasi-pure pitch-angle scattering of energetic electrons driven by field-alignedpropagating whistler mode waves during the 9～15 October 1990 magnetic storm at L≈3～4is studied,and numerical calculations for energetic electrons in gyroresonance with a band offrequency of whistler mode waves distributed over a standard Gaussian spectrum is performed.Itis found that the whistler mode waves can efficiently drive energetic electrons from the larger pitch-angles into the loss cone,and lead to a flat-top distribution during the main phase of geomagneticstorms.This result perhaps presents a feasible interpretation for observation of time evolution ofthe quasi-isotropic pitch-angle distribution by Combined Release and Radiation Effects Satellite(CRRES) spacecraft at L≈3～4.

The quasi-pure scattering of energetic electrons driven by field-alignedpropagating whistler mode waves during the 9 ~ 15 October 1990 magnetic storm at L≈3 ~ 4is studied, and numerical calculations for energetic electrons in gyroresonance with a band offrequency of whistler mode waves distributed over a standard Gaussian spectrum is performed. Ist found that the whistler mode waves can efficiently drive energetic electrons from the larger pitch-angles into the loss cone, and lead to a flat-top distribution during the main phase of geomagnetic storms.This result perhaps presents a feasibility interpretation for observation of time evolution of the quasi-isotropic pitch-angle distribution by Combined Release and Radiation Effects Satellite (CRRES) spacecraft at L≈3 ~ 4.