Multi-case Study of Current Sheet Flapping Motions Induced by Non-adiabatic Ions  

作　　者：WEI Xinhua CAI Chunlin 

机构地区：[1]State Key Laboratory of Space Weather,National Space Science Center,Chinese Academy of Sciences,Beijing 100190

出　　处：《空间科学学报》2021年第6期858-868,共11页Chinese Journal of Space Science

基　　金：the National Natural Science Foundation of China(41174144,40974098)。

摘　　要：In this paper,the y-component of magnetic field line curvature in the plasma sheet was analyzed,and two kinds of shear structures of the flapping current sheet were found,i.e.symmetric and antisymmetric.The alternating bending orientations of the guiding field are exactly corresponding to alternating north-south asymmetries of the bouncing ion population in the sheet center.Those alternating asymmetric plasma sources consequently induce the current sheet flapping motion as a driver.In addition,a substantial particle population with downward motion was observed in the center of a bifurcated current sheet.This population is identified as the quasi-adiabatic particles,and provides a net current opposite to the conventional cross-tail current.

关 键 词：FLAPPING current sheet Quasi-adiabatic particles MAGNETOTAIL 

分 类 号：P353[天文地球—空间物理学]