Hemispheric Distribution of Lower-band Chorus Waves Observed by Van Allen Probes  

作　　者：CHENG Xiaowei GU Xudong NI Binbin ZHANG Yang 

机构地区：[1]Department of Space Physics,School of Electronic Information,Wuhan University,Wuhan 430072

出　　处：《空间科学学报》2020年第2期186-196,共11页Chinese Journal of Space Science

基　　金：Supported by the National Natural Science Foundation of China(41674163,41574160);the Hubei Province Natural Science Excellent Youth Foundation(2016CFA044)。

摘　　要：Whistler mode chorus waves are important electromagnetic emissions due to their dual roles in acceleration and loss processes of Earth's radiation belt electrons.A detailed global survey of lower-band chorus is performed using EMFISIS data from Van Allen Probes in near-equatorial orbits.In addition to the confirmation of the positive correlation of chorus wave intensities to geomagnetic activity and dayside-nightside distribution asymmetry of wave amplitude and occurrence probability,the analysis results find that in statistics lower-band chorus emissions exhibit higher wave occurrence rates and larger normalized peak wave frequencies in the magnetically northern hemisphere but somehow stronger peak wave intensities in the magnetically southern hemisphere.While overall the differences between the two magnetically hemispheric distributions tend to be not significant,it is important to establish the magnetically hemispheric distribution profiles of lowerband chorus with respect to L-shell,magnetic local time,and geomagnetic latitude for improved understanding of chorus-induced dynamics of radiation belt electrons.

关 键 词：Lower-band CHORUS HEMISPHERIC DISTRIBUTION WAVE intensities Occurrence rates Normalized peak WAVE frequency 

分 类 号：P353[天文地球—空间物理学]