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Nonlinear explosive magnetic reconnection in a collisionless system
Physics of Plasmas ( IF 2.2 ) Pub Date : 2021-06-15 , DOI: 10.1063/5.0050389
Masahiro Hoshino 1
Affiliation  

The debate surrounding fast magnetic energy dissipation by magnetic reconnection has remained a fundamental topic in the plasma universe, not only in the Earth's magnetosphere but also in astrophysical objects such as pulsar magnetospheres and magnetars, for more than half a century. Recently, nonthermal particle acceleration and plasma heating during reconnection have been extensively studied, and it has been argued that rapid energy dissipation can occur for a collisionless “thin” current sheet, the thickness of which is of the order of the particle gyroradius. However, it is an intriguing enigma as to how the fast energy dissipation can occur for a “thick” current sheet with thickness larger than the particle gyroradius. Here we demonstrate, using a high-resolution particle-in-cell simulation for a pair plasma, that an explosive reconnection can emerge with the enhancement of the inertia resistivity due to the magnetization of the meandering particles by the reconnecting magnetic field and the shrinkage of the current sheet. In addition, regardless of the initial thickness of the current sheet, the timescale of the nonlinear explosive reconnection is tens of the Alfvén transit time.

中文翻译:

无碰撞系统中的非线性爆炸磁重联

半个多世纪以来,围绕磁重联导致的快速磁能耗散的争论一直是等离子体宇宙中的一个基本话题,不仅在地球磁层中,而且在脉冲星磁层和磁星等天体物理物体中也是如此。最近,重新连接过程中的非热粒子加速和等离子体加热已被广泛研究,并且有人认为无碰撞的“薄”电流片可能发生快速能量耗散,其厚度约为粒子回旋半径的数量级。然而,对于厚度大于粒子回旋半径的“厚”电流片如何发生快速能量耗散,这是一个有趣的谜。在这里,我们展示了,使用一对等离子体的高分辨率粒子胞内模拟,由于重新连接的磁场和电流片的收缩导致蜿蜒粒子的磁化,随着惯性电阻率的增强,可以出现爆炸性的重新连接。此外,无论电流片的初始厚度如何,非线性爆炸重联的时间尺度都是阿尔芬渡越时间的几十倍。
更新日期:2021-06-30
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