Topological structure of the magnetotail as a function of interplanetary magnetic field direction
Topological structure of the magnetotail as a function of interplanetary magnetic field direction
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DOI：
10.1029/94ja02577
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发表时间：
1995-03
影响因子：
--
通讯作者：
J. Fedder;J. Lyon;S. Slinker;C. Mobarry
中科院分区：
文献类型：
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作者：
J. Fedder;J. Lyon;S. Slinker;C. Mobarry
行星际磁场（IMF）和地磁场之间的磁重联被认为在太阳风动量和能量向磁层的转移中起着重要作用。当磁场磁场与地磁场的夹角在磁层弓部发生变化时，磁层弓部重联区的拓扑记录应该记录在磁鞘和磁层顶沿着侧部，因为超高速流将弓部重联区形成的强磁场梯度冻结到下游等离子体中。在这份报告中，我们提出的结果从一个三维的，磁流体动力学（MHD），全球数值模拟代码之间的分界线的位置不相连的IMF磁鞘场线和重新连接的场线，穿透磁层顶和连接到极地电离层。IMF方向和分界线穿过磁层顶的线之间的角度被证明是IMF钟角的敏感函数。我们还解释了如何可以使用这种行为来推导出一个近似的跨极电压的IMF时钟角的依赖关系。最后，我们注意到磁等离子体模拟的物理边界条件的重要性，谨慎。
Magnetic reconnection between the interplanetary magnetic field (IMF) and the geomagnetic field is thought to play a major role in the transfer of solar wind momentum and energy to the magnetosphere. As the angle between the IMF and the geomagnetic field is changed at the bow of the magnetosphere, the topological record of the location of the reconnection region should be recorded in the magnetosheath and on the magnetopause along the flanks of the tail, because the super fast flow freezes strong magnetic gradients formed in the bow reconnection regions into the plasma downstream. In this report, we present results from a three-dimensional, magnetohydrodynamic (MHD), global numerical simulation code for the location of the separatrix between unconnected IMF magnetosheath field lines and reconnected field lines which penetrate the magnetopause and connect to the polar ionosphere. The angle between the IMF direction and the line where the separatrix crosses the magnetopause is shown to be a sensitive function of the IMF clock angle. We also explain how this behavior can be used to derive an approximate relation for the dependence of the cross-polar voltage on the IMF clock angle. We conclude with a note of caution concerning the importance of physical boundary conditions in magnetoplasma simulations.