Ng J, Chen L-J, Bessho N, Shuster J, Burkholder B, Yoo J
Department of Astronomy University of Maryland College Park MD USA.
NASA Goddard Space Flight Center Greenbelt MD USA.
Geophys Res Lett. 2022 Aug 16;49(15):e2022GL099544. doi: 10.1029/2022GL099544. Epub 2022 Aug 15.
Magnetic reconnection has been observed in the transition region of quasi-parallel shocks. In this work, the particle-in-cell method is used to simulate three-dimensional reconnection in a quasi-parallel shock. The shock transition region is turbulent, leading to the formation of reconnecting current sheets with various orientations. Two reconnection sites with weak and strong guide fields are studied, and it is shown that reconnection is fast and transient. Reconnection sites are characterized using diagnostics including electron flows and magnetic flux transport. In contrast to two-dimensional simulations, weak guide field reconnection is realized. Furthermore, the current sheets in these events form in a direction almost perpendicular to those found in two-dimensional simulations, where the reconnection geometry is constrained.
在准平行激波的过渡区域已观测到磁重联现象。在这项工作中，采用粒子模拟方法对准平行激波中的三维重联进行了模拟。激波过渡区域是湍流的，导致形成具有各种取向的重联电流片。研究了具有弱引导场和强引导场的两个重联位点，结果表明重联是快速且瞬态的。利用包括电子流和磁通量输运在内的诊断方法对重联位点进行了表征。与二维模拟不同，实现了弱引导场重联。此外，这些事件中的电流片形成方向几乎垂直于二维模拟中发现的方向，在二维模拟中重联几何结构受到限制。
