Faster form of electron magnetic reconnection with a finite length X-line
Faster form of electron magnetic reconnection with a finite length X-line
复制标题
有限长度 X 线的更快形式的电子磁重联
DOI：
10.1103/physrevlett.127.155101
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发表时间：
2021
影响因子：
8.6
通讯作者：
Verniero, J. L.
中科院分区：
文献类型：
--
作者：
Pyakurel, P. S.;Shay, M. A.;Drake, J. F.;Phan, T. D.;Cassak, P. A.;Verniero, J. L.
在准平行弓形激波下游的地球湍流磁鞘中观察到，在离子不耦合到重连磁场的情况下，普遍存在有利于电子重连的电子尺度电流片。在小规模湍流中，与强电流片相关的磁结构在所有维度上都是有限的。由于离子的耦合受到最小长度尺度的限制，电子重联的动力学可能是三维的。在这里，二维和三维动力学粒子在电池中模拟用于研究电子重联，重点关注重联率和相关的电子流。当磁x线定位在面外方向时，自发地产生了一种新的三维电子重联形式。结果是，与二维相比，重联速率提高了，这是由于沿扩散区流出的质量通量不同，使得流入速度更快，因此重联速率也更大。这种外流是由于磁性张力的作用，就像传统的排气张力一样，允许颗粒沿着二维结构有效地离开扩散区。
Observations in Earth’s turbulent magnetosheath downstream of a quasiparallel bow shock reveal a prevalence of electron-scale current sheets favorable for electron-only reconnection where ions are not coupled to the reconnecting magnetic fields. In small-scale turbulence, magnetic structures associated with intense current sheets are limited in all dimensions. And since the coupling of ions are constrained by a minimum length scale, the dynamics of electron reconnection is likely to be 3D. Here, both 2D and 3D kinetic particle-in-cell simulations are used to investigate electron-only reconnection, focusing on the reconnection rate and associated electron flows. A new form of 3D electron-only reconnection spontaneously develops where the magnetic X-line is localized in the out-of-plane () direction. The consequence is an enhancement of the reconnection rate compared with two dimensions, which results from differential mass flux out of the diffusion region along, enabling a faster inflow velocity and thus a larger reconnection rate. This outflow alongis due to the magnetic tension force injust as the conventional exhaust tension force, allowing particles to leave the diffusion region efficiently alongunlike the 2D configuration.