IRAP, UPS -OMP, Université de Toulouse, CNRS, Toulouse, France
Space Sciences Laboratory, University of California, Berkeley, California, USA
Abstract. In this paper, we analyzed the y-component of magnetic field line curvature in the plasma sheet and found that there are two kinds of shear structures of the flapping current sheet, i.e. symmetric and antisymmetric. The alternating bending orientations of 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 dawnward 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.
How to cite. Wei, X., Cai, C., Rème, H., Dandouras, I., and Parks, G.: The current sheet flapping motions induced by non-adiabatic ions: case study, Ann. Geophys. Discuss. [preprint], https://doi.org/10.5194/angeo-2018-124, 2018.
Received: 05 Nov 2018 – Discussion started: 06 Dec 2018
Observations of ﬂapping current sheet in the magnetotail are presented to reveal their intrinsic excitation mechanism induced by alternating north-south asymmetric ion populations in the sheet center. The results suggest that nonadiabatic ions play a substantial role to determine current sheet dynamics, both its bulk mechanical instability and current profiles.
Observations of ﬂapping current sheet in the magnetotail are presented to reveal their...