Dynamic Processes of Cross-Tail Current in the Near-Earth Magnetotail

doi:10.1088/0256-307X/26/5/059401

Chin. Phys. Lett.

2009, Vol. 26

Issue (5): 059401 DOI: 10.1088/0256-307X/26/5/059401

GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS

Dynamic Processes of Cross-Tail Current in the Near-Earth Magnetotail

LU Xing-Qiang¹, MA Zhi-Wei^1,2

¹Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031²Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027

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LU Xing-Qiang, MA Zhi-Wei 2009 Chin. Phys. Lett. 26 059401

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Abstract Current dynamic processes in realistic magnetotail geometry are studied by Hall magnetohydrodynamic (MHD) simulations under various driven conditions and Hall effects. Associated with the external driving force, a thin current sheet with a broad extent is built up in the near-Earth magnetotail. The time evolution for the formation of the current sheet comprises two phases: slow growth and a fast impulsive phase before the near-Earth disruption of the current sheet resulting from the fast magnetic reconnection. The simulation results indicate that as the external driving force increases, the site and the tailward speed of the near-Earth current disruption region are closer to the Earth and faster, respectively. Whether the near-Earth disruption of the current sheet takes place or not is mainly controlled by Hall effects. It is found that there is no sudden disruption of the current sheet in the near-Earth region if the ion inertial length is below d_i=0.04.

Keywords: 94.30.Lr 94.30.C- 94.30.Cp

Received: 30 October 2008 Published: 23 April 2009

PACS:	94.30.Lr	(Magnetic storms, substorms)
	94.30.C-	(Magnetospheric configuration and dynamics)
	94.30.cp	(Magnetic reconnection)

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https://cpl.iphy.ac.cn/10.1088/0256-307X/26/5/059401 OR https://cpl.iphy.ac.cn/Y2009/V26/I5/059401

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