Dynamic Processes of Cross-Tail Current in the Near-Earth Magnetotail
LU Xing-Qiang1, MA Zhi-Wei1,2
1Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 2300312Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027
Dynamic Processes of Cross-Tail Current in the Near-Earth Magnetotail
LU Xing-Qiang1, MA Zhi-Wei1,2
1Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 2300312Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027
摘要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 di=0.04.
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 di=0.04.
LU Xing-Qiang;MA Zhi-Wei;. Dynamic Processes of Cross-Tail Current in the Near-Earth Magnetotail[J]. 中国物理快报, 2009, 26(5): 59401-059401.
LU Xing-Qiang, MA Zhi-Wei,. Dynamic Processes of Cross-Tail Current in the Near-Earth Magnetotail. Chin. Phys. Lett., 2009, 26(5): 59401-059401.
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2009, Vol. 26 
