中国物理B ›› 2021, Vol. 30 ›› Issue (10): 109401-109401.doi: 10.1088/1674-1056/abf556

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

Zhen-Xia Zhang(张振霞)1,†, Ruo-Xian Zhou(周若贤)2, Man Hua(花漫)2, Xin-Qiao Li(李新乔)3, Bin-Bin Ni(倪彬彬)2, and Ju-Tao Yang(杨巨涛)4   

  1. 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
  • 收稿日期:2021-01-05 修回日期:2021-03-28 接受日期:2021-04-07 发布日期:2021-09-17
  • 通讯作者: Zhen-Xia Zhang E-mail:zxzhang2018@163.com
  • 基金资助:
    Project 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), and the National Institute of Natural Hazards, Ministry of Emergency Management of China (Grant No. 2021-JBKY-11).

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

Zhen-Xia Zhang(张振霞)1,†, Ruo-Xian Zhou(周若贤)2, Man Hua(花漫)2, Xin-Qiao Li(李新乔)3, Bin-Bin Ni(倪彬彬)2, and Ju-Tao Yang(杨巨涛)4   

  1. 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
  • Received:2021-01-05 Revised:2021-03-28 Accepted:2021-04-07 Published:2021-09-17
  • Contact: Zhen-Xia Zhang E-mail:zxzhang2018@163.com
  • Supported by:
    Project 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), and the National Institute of Natural Hazards, Ministry of Emergency Management of China (Grant No. 2021-JBKY-11).

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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

Abstract: 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.

Key words: chorus acceleration, extremely low L-shell, numerical simulation, ZH-1 satellite, Van Allen probes

中图分类号:  (Wave/particle interactions)

  • 94.20.wj
94.30.Xy (Radiation belts)