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

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 V2/m2/Hz)with frequency of 0.1 fce-0.5 fce occu...

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Published inEarth and planetary physics Vol. 7; no. 6; pp. 607 - 614
Main Authors Li, Tong, Liu, Si, Yang, Chang, Xiao, FuLiang, Yang, HongMing, Zhang, Sai, Gao, ZhongLei, He, Qian, Zhou, QingHua, Yang, QiWu, He, YiHua
Format Journal Article
LanguageEnglish
Published School of Physics and Electronic Sciences,Changsha University of Science and Technology,Changsha 410114,China 01.11.2023
Hunan Provincial Key Laboratory of Flexible Electronic Materials Genome Engineering,Changsha University of Science and Technology,Changsha 410114,China%School of Physics and Electronic Sciences,Changsha University of Science and Technology,Changsha 410114,China%School of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410114,China
Science Press
Subjects
diffusion coefficients
electron scattering
martian magnetosphere
whistler mode waves
whistler mode waves
Martian magnetosphere
diffusion coefficients
electron scattering
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Summary: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 V2/m2/Hz)with frequency of 0.1 fce-0.5 fce 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.
ISSN:2096-3955
2096-3955
DOI:10.26464/epp2023086