Field‐aligned currents generated in magnetotail reconnection: 3D Hall‐MHD simulations
Field‐aligned currents generated in magnetotail reconnection: 3D Hall‐MHD simulations
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DOI：
10.1029/1999gl003688
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发表时间：
2000-04
影响因子：
5.2
通讯作者：
Y. Yamade;M. Fujimoto;N. Yokokawa;M. Nakamura
中科院分区：
文献类型：
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作者：
Y. Yamade;M. Fujimoto;N. Yokokawa;M. Nakamura
了解亚暴中的场向电流（FAC）系统是磁层物理学的中心主题之一。磁尾重联的三维（3D）磁流体动力学（MHD）模拟表明，无论是否在电流片的地球端存在偶极区，都可以再现类似于楔流系统的FAC结构。然而，在这项研究中，通过注意到与磁尾中的电流片宽度相比，离子惯性长度不是微不足道的小，我们研究了Hall - MHD系统中FAC的产生机制。对于没有偶极区的理想电流片几何，我们发现得到的结果与MHD的结果完全不同。
Understanding the field aligned current (FAC) system in substorms is one of the central themes of magnetospheric physics. Three‐dimensional (3D) magnetohydrodynamic (MHD) simulations of magnetotail reconnection has shown that FAC structures similar to the wedge‐current system are indeed reproduced either with or without a dipolar region situated at the earthward end of a current sheet. In this study, however, by noting that the ion inertia length is not negligibly small compared to the current sheet width in the magnetotail, we investigate the FAC generation mechanism in the Hall‐MHD system. For an idealized current sheet geometry without the dipolar region, we find that the results obtained to be totally different from the MHD results.