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arXiv 1504.03300physics.space-phastro-ph.EPastro-ph.SRphysics.plasm-ph
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非对称磁重联中x线的取向与质量比的关系

Orientation of x-lines in asymmetric magnetic reconnection - mass ratio dependency

Yi-Hsin Liu, Michael Hesse, Masha Kuznetsova

摘要:

利用全动力学模拟,我们研究了非对称位形中磁重联的x线取向。一个空间局部扰动诱导一个单一的x线,有足够的自由度来选择其在三维系统中的方向。离子与电子的质量比的影响进行了研究,和x线出现平分的磁剪切角在大的质量比限制的电流片。通常可以通过扫描相应的2D模拟来推导取向,以找到使峰值重联电场最大化的重联平面。在质量比下限时偏离对分角的现象可以用撕裂不稳定性的物理机制来解释。

英文摘要:

Using fully kinetic simulations, we study the x-line orientation of magnetic reconnection in an asymmetric configuration. A spatially localized perturbation is employed to induce a single x-line, that has sufficient freedom to choose its orientation in three-dimensional systems. The effect of ion to electron mass ratio is investigated, and the x-line appears to bisect the magnetic shear angle across the current sheet in the large mass ratio limit. The orientation can generally be deduced by scanning through corresponding 2D simulations to find the reconnection plane that maximizes the peak reconnection electric field. The deviation from the bisection angle in the lower mass ratio limit can be explained by the physics of tearing instability.

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