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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 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 |
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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.
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Received: 05 January 2021
Revised: 28 March 2021
Accepted manuscript online: 07 April 2021
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PACS:
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94.20.wj
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(Wave/particle interactions)
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94.30.Xy
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(Radiation belts)
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Fund: 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). |
Corresponding Authors:
Zhen-Xia Zhang
E-mail: zxzhang2018@163.com
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Cite this article:
Zhen-Xia Zhang(张振霞), Ruo-Xian Zhou(周若贤), Man Hua(花漫), Xin-Qiao Li(李新乔), Bin-Bin Ni(倪彬彬), and Ju-Tao Yang(杨巨涛) Numerical simulation of chorus-driving acceleration of relativistic electrons at extremely low L-shell during geomagnetic storms 2021 Chin. Phys. B 30 109401
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