论文标题
在倾斜不稳定性的非线性进化期间，高量Quist-number策略中的Petschek型重新连接
Petschek-type reconnection in the high-Lundquist-number regime during nonlinear evolution on the tilt instability
论文作者
论文摘要
使用最近开发的自适应有限元磁性水力动力（MHD）代码研究了高隆奎斯特数（$ s $）制度中浆液链形成的快速磁重新连接的过程。我们采用二维不可压缩模型，并具有一组减少的粘性MHD方程。选择倾斜不稳定性设置是为了提供三步机制，其中两个弯曲的电流最初以alfvénic时间尺度形成，然后是$ s \ ge s_c $（Baty 2020）的血浆链超级αNIC生长的第二阶段。到达了第三阶段，随后的随机时间依赖时间重新连接制度与快速的时间平均率无关，而与$ s $无关。我们揭示了磁重新连接期间的多尺度电流结构，其中浆液的合并事件会导致怪物等离子体，并带有冲击流出区域的冲击。在足够高的$ s $值（通常对于$ s \ sim 100 s_c $）下，通过从一个包含几个浆液物的小型中央区域发出的一对慢模式冲击来实现动态的Petschek型重新连接。最后，我们简要讨论了结果的相关性，以解释太阳能电晕和Tokamaks内部破坏的爆发活动。
The process of fast magnetic reconnection supported by the formation of plasmoid chains in the high Lundquist number ($S$) regime is investigated using a recently developed adaptive finite-element magnetohydrodynamic (MHD) code. We employ a two-dimensional incompressible model with a set of reduced visco-resistive MHD equations. The tilt instability setup is chosen to provide a three-step mechanism, where two curved current sheets initially form on an Alfvénic time scale followed by a second phase of super-Alfvénic growth of plasmoid chains for $S \ge S_c$ (Baty 2020). A third phase is reached where an ensuing stochastic time-dependent reconnection regime with a fast time-averaged rate independent of $S$ is obtained. We reveal the multi-scale current structures during magnetic reconnection, where merging events of plasmoids give rise to monster plasmoids with shocks bounding the outflow regions. At high enough $S$ values (typically for $S \sim 100 S_c$), a dynamical Petschek-type reconnection is achieved with pairs of slow-mode shocks emanating from a small central region containing a few plasmoids. Finally, we briefly discuss the relevance of our results to explain the flaring activity in solar corona and internal disruptions in tokamaks.
