Direct evidence for efficient scattering of suprathermal electrons by whistler mode waves in the Martian magnetosphere  

作　　者：Tong Li Si Liu Chang Yang FuLiang Xiao HongMing Yang Sai Zhang ZhongLei Gao Qian He QingHua Zhou QiWu Yang YiHua He 

机构地区：[1]School of Physics and Electronic Sciences,Changsha University of Science and Technology,Changsha 410114,China [2]Hunan Provincial Key Laboratory of Flexible Electronic Materials Genome Engineering,Changsha University of Science and Technology,Changsha 410114,China [3]School of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410114,China

出　　处：《Earth and Planetary Physics》2023年第6期607-614,共8页地球与行星物理（英文版）

基　　金：the National Natural Science Foundation of China grants 42230209, 42241136, 42374199, 42204171, 42274212;the Natural Science Foundation of Hunan province Grant 2021JJ20010, 2023JJ20038

摘　　要：Whistler mode waves are critical emissions in magnetized plasmas that usually influence the electron dynamics in a planetary magnetosphere.In this paper,we present a unique event in the Martian magnetosphere in which enhanced whistler mode waves(~10^(−11) V^(2)/m^(2)/Hz)with frequency of 0.1 f_(ce)-0.5 f_(ce) occurred,based on MAVEN data,exactly corresponding to a significant decrease of suprathermal electron fluxes.The diffusion coefficients are calculated by using the observed electric field wave spectra.The pitch angle diffusion coefficient can approach 10^(−2) s^(−1),which is much larger,by~100 times,than the momentum diffusion coefficient,indicating that pitch angle scattering dominates the whistler-electron resonance process.The current results can successfully explain the dropout of the suprathermal electrons in this event.This study provides direct evidence for whistler-driven electron losses in the Martian magnetosphere.

关 键 词：whistler mode waves diffusion coefficients electron scattering Martian magnetosphere 

分 类 号：P185.3[天文地球—天文学]