Fast magnetic reconnection in a kinked current sheet
Fast magnetic reconnection in a kinked current sheet
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DOI：
10.1063/1.3106685
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发表时间：
2009-04
影响因子：
2.2
通讯作者：
K. Fujimoto
中科院分区：
文献类型：
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作者：
K. Fujimoto
在一个大系统中，使用三维电磁粒子在细胞模拟的撕裂和扭结模式都能够被捕获的扭结电流片的磁重联过程进行了研究。采用自适应网格加密和粒子分裂-合并方法有效地提高了空间分辨率。由电流片宽度缩放的扭结模式（例如kyL λ 1）由由于离子尺度扩散区域中的重连电场而加速的离子驱动。虽然扭折模使电流片结构发生了剧烈的变形，但总的重联速率与没有扭折模的情况几乎相同，并且实现了快速的磁重联。磁耗散机制，然而，发现有和没有扭结模式的情况下有很大的不同。扭折模加宽了电流片宽度，降低了电子流速，从而降低了电子惯性电阻率。然而，异常dissi…
Magnetic reconnection processes in a kinked current sheet are investigated using three-dimensional electromagnetic particle-in-cell simulations in a large system where both the tearing and kink modes are able to be captured. The spatial resolution is efficiently enhanced using the adaptive mesh refinement and particle splitting-coalescence method. The kink mode scaled by the current sheet width such as kyL∼1 is driven by the ions that are accelerated due to the reconnection electric field in the ion-scale diffusion region. Although the kink mode deforms the current sheet structure drastically, the gross rate of reconnection is almost identical to the case without the kink mode and fast magnetic reconnection is achieved. The magnetic dissipation mechanism is, however, found very different between the cases with and without the kink mode. The kink mode broadens the current sheet width and reduces the electron flow velocity, so that the electron inertia resistivity is decreased. Nevertheless, anomalous dissi...