论文标题
在高隆德奎斯特数字上的湍流中快速磁重新连接
Fast Magnetic Reconnection with Turbulence in High Lundquist Number Limit
论文作者
论文摘要
我们使用广泛的3D电阻MHD模拟来研究当系统在系统受到不同外部驱动的湍流水平以及由3D Requnection Dynamics产生的自我生成的湍流时，当前电流将在高Lundquist数字$ s $ limit（高于$ \ sim 10^4 $）中进行快速重新连接。我们发现，归一化的全球重新连接率$ \ sim 0.01-0.13 $，弱依赖于$ s $。观察到与经典的流入/流出配置的全局重新连接，并从重新连接区域形成3D通量绳。重新连接的磁场线的统计分离遵循了超扩散的行为，从中测量的速率与从示踪剂种群的混合中获得的速率非常相似。我们发现重新连接峰值在重新连接的峰值期间的湍流水平大致线性缩放。这种缩放与外部驱动和自生过程产生的湍流特性一致。这些结果表明，大规模的薄电流板往往会经历严格的重新连接。
We use extensive 3D resistive MHD simulations to study how large-scale current sheets will undergo fast reconnection in the high Lundquist number $S$ limit (above $\sim 10^4$), when the system is subject to different externally driven turbulence levels and the self-generated turbulence produced by 3D reconnection dynamics. We find that the normalized global reconnection rate $\sim 0.01 - 0.13$, weakly dependent on $S$. Global reconnection with the classic inflow/outflow configurations is observed, and 3D flux ropes are hierarchically formed and ejected from reconnection regions. A statistical separation of the reconnected magnetic field lines follows a super-diffusive behavior, from which the rate is measured to be very similar to that obtained from the mixing of tracer populations. We find that the reconnection rate scales roughly linearly with the turbulence level during the peak of reconnection. This scaling is consistent with the turbulence properties produced by both the externally driven and self-generation processes. These results imply that large-scale thin current sheets tend to undergo rigorous reconnection.
