Effects of Hall electric fields on the saturation of forced antiparallel magnetic field merging
Effects of Hall electric fields on the saturation of forced antiparallel magnetic field merging
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DOI：
10.1063/1.1589007
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发表时间：
2003-07
影响因子：
2.2
通讯作者：
J. Dorelli
中科院分区：
文献类型：
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作者：
J. Dorelli
研究了霍尔电场在磁通堆积反平行磁场合并中的作用。给出了描述薄电流片中驻点流动的电阻性霍尔磁流体动力学（Hall-MHD）方程的解析解。驻点流动的解决方案解释了一些有趣的影响，观察到在二维电阻霍尔-MHD模拟强迫磁场重联。特别地，当霍尔电场在电流片内是重要的时，在电流片的上游需要较少的磁能堆积以支持给定的重联电场。快速电子流将磁通量传输到扩散层中，而不需要电流片上游的等离子体压力的补偿下降。由外部等离子体压力允许的最大通量堆积合并率变得独立的Lundquist数，缩放像离子惯性长度的比例的平方根的空间尺度的停滞点。
The role of Hall electric fields in flux pile-up antiparallel magnetic field merging is addressed. Analytical solutions of the resistive Hall magnetohydrodynamics (Hall-MHD) equations are obtained, describing stagnation point flows in a thin current sheet. The stagnation point flow solutions explain a number of interesting effects observed in two-dimensional resistive Hall-MHD simulations of forced magnetic reconnection. In particular, when Hall electric fields are important within the current sheet, less pile-up of magnetic energy is required upstream of the current sheet to support a given reconnection electric field. Fast electron flows transport magnetic flux into the diffusion layer without requiring a compensating drop in plasma pressure upstream of the current sheet. The maximum flux pile-up merging rate allowed by the external plasma pressure becomes independent of the Lundquist number, scaling like the square root of the ratio of the ion inertial length to the spatial scale of the stagnation poin...