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arXiv 0908.4507astro-ph.SR
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三维零点处的磁重联:磁场不对称性的影响

Magnetic reconnection at 3D null points: effect of magnetic field asymmetry

A. K. Al-Hachami, D. I. Pontin

摘要:

本文的目的是研究三维零点处的磁重联的性质,以及它们对零点周围磁场对称性的依赖性。特别是,我们研究的速率通量运输的零点与对称/非对称扩散区域,以及如何形成的电流片的时间,及其属性。数学建模和有限差分电阻MHD模拟。研究发现,改变磁场对称性不影响磁重联模式的基本结构,即等离子体流穿过零点的脊和扇。然而,电流片的峰值强度和尺寸取决于场线的对称性/不对称性。其结果是,重联率也被发现是强烈依赖于场的不对称性。

英文摘要:

The aim of this paper is to investigate the properties of magnetic reconnection at a 3D null point, with respect to their dependence on the symmetry of the magnetic field around the null. In particular we examine the rate of flux transport across the null point with symmetric/asymmetric diffusion regions, as well as how the current sheet forms in time, and its properties. Mathematical modelling and finite difference resistive MHD simulations are used. It is found that the basic structure of the mode of magnetic reconnection considered is unaffected by varying the magnetic field symmetry, that is, the plasma flow is found cross both the spine and fan of the null. However, the peak intensity and dimensions of the current sheet are dependent on the symmetry/ asymmetry of the field lines. As a result, the reconnection rate is also found to be strongly dependent on the field asymmetry.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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