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 alternatin...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.展开更多
基金the National Natural Science Foundation of China(41174144,40974098)。
文摘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.
