Numerical simulation on the multiple dipolarization fronts in the magnetotail
Numerical simulation on the multiple dipolarization fronts in the magnetotail
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DOI：
10.1063/1.4996039
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发表时间：
2017-10
影响因子：
2.2
通讯作者：
Haoyu Lu;Yun Li;Jinbin Cao;Y. Ge;Tielong Zhang;Yiqun Yu
中科院分区：
文献类型：
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作者：
Haoyu Lu;Yun Li;Jinbin Cao;Y. Ge;Tielong Zhang;Yiqun Yu
使用包括大厅效应和有限的LARMOR半径效应的扩展MHD模型，我们重现了与互换不稳定性相关的多个偶极前线（DFS），该互换不稳定性在爆发板的制动区域中，我们的模拟表明，我们的模拟均显示了多个DF。互换不稳定是“增长”类型的DF，因为最大的血浆流速在前后。近地区域的互换电场是浸入式电场的主要电场组件，而对流层和电压梯度电场成分较小。与对相对的电流相对应的DF层主要与电子电流相关。浸入区域的下降电流，这可以产生前方的倾角...
Using an extended MHD model including the Hall effect and finite Larmor radius effect, we reproduce multiple dipolarization fronts (DFs) associated with the interchange instability in the braking region of bursty bulk flow in the plasma sheet. Our simulations reveal that the multiple DFs produced by the interchange instability are “growing” type DFs because the maximum plasma flow speeds are behind the fronts. Both the earthward and tailward moving DFs can be produced by interchange instability in the near-Earth region. The Hall electric field is the dominant electric field component in the dip region and the DF layer. The convective and the electron pressure gradient electric field components are smaller. The sharp Bz changes in both the dip region and DF layer correspond to the oppositely directed currents that are primarily associated with electrons. The ion diamagnetic current due to the strong ion pressure gradient causes an intense downward current in the dip region, which can produce the dip ahead ...