Numerical simulation of chorus-driving acceleration of relativistic electrons at extremely low L-shell during geomagnetic storms  

作　　者：Zhen-Xia Zhang Ruo-Xian Zhou Man Hua Xin-Qiao Li Bin-Bin Ni Ju-Tao Yang 张振霞;周若贤;花漫;李新乔;倪彬彬;杨巨涛(National Institute of Natural Hazards,MEMC,Beijing 100085,China;Department of Space Physics,School of Electronic Information,Wuhan University,Wuhan 430072,China;Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China;National Key Laboratory of Electromagnetic Environment,China Research Institute of Radiowave Propagation,Qingdao 266107,China)

机构地区：[1]National Institute of Natural Hazards,MEMC,Beijing 100085,China [2]Department of Space Physics,School of Electronic Information,Wuhan University,Wuhan 430072,China [3]Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100049,China [4]National Key Laboratory of Electromagnetic Environment,China Research Institute of Radiowave Propagation,Qingdao 266107,China

出　　处：《Chinese Physics B》2021年第10期711-718,共8页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41904149 and 12173038);Stable-Support Scientific Project of China Research Institute of Radiowave Propagation(Grant No.A132001W07);the National Institute of Natural Hazards,Ministry of Emergency Management of China(Grant No.2021-JBKY-11).

摘　　要：During 2018 major geomagnetic storm,relativistic electron enhancements in extremely low L-shell regions(reaching L∼3)have been reported based on observations of ZH-1 and Van Allen probes satellites,and the storm is highly likely to be accelerated by strong whistler-mode waves occurring near very low L-shell regions where the plasmapause was suppressed.It is very interesting to observe the intense chorus-accelerated electrons locating in such low L-shells and filling into the slot region.In this paper,we further perform numerical simulation by solving the two-dimensional Fokker-Planck equation based on the bounce-averaged diffusion rates.Numerical results demonstrate the evolution processes of the chorus-driven electron flux and confirm the flux enhancement in low pitch angle ranges(20◦-50◦)after the wave-particle interaction for tens of hours.The simulation result is consistent with the observation of potential butterfly pitch angle distributions of relativistic electrons from both ZH-1 and Van Allen probes.

关 键 词：chorus acceleration extremely low L-shell numerical simulation ZH-1 satellite Van Allen probes 

分 类 号：P353[天文地球—空间物理学]