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

作　　者：路兴强 马志为 

机构地区：[1]Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031 [2]Institute for Fusion Theory and Simulation, Zhejiang University, Hangzhou 310027

出　　处：《Chinese Physics Letters》2009年第5期266-269,共4页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant No 40536030, and the National Basic Research Programme of China under Grant No 2008CB717806

摘　　要：Current dynamic processes in realistic magnetotail geometry simulations under various driven conditions and Hall effects. are studied by Hall magnetohydrodynamic （MHD） 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.Current dynamic processes in realistic magnetotail geometry simulations under various driven conditions and Hall effects. are studied by Hall magnetohydrodynamic （MHD） 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.

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TG385.2[自动化与计算机技术—控制科学与工程]