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

doi:10.1088/1674-1056/abf556

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.

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

Received: 05 January 2021
Revised: 28 March 2021
Accepted manuscript online: 07 April 2021

PACS:	94.20.wj	(Wave/particle interactions)
	94.30.Xy	(Radiation belts)

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

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