arXiv 1202.01612012-02-01astro-ph.SR

二维非无力电流层上自发重联的结果

Consequences of spontaneous reconnection at a two-dimensional non-force-free current layer

Jorge Fuentes-Fernández, Clare E. Parnell, Alan W. Hood, Eric R. Priest, Dana W. Longcope

DOI：: 10.1063/1.3683002

摘要：

磁中性点是太阳日冕中能量转换的潜在场所，磁场在中性点处消失。事实上，磁场是相同的零，在这些点表明，为研究电流片的形成和任何随后的电阻耗散阶段，应考虑一个有限的β等离子体，而不是忽略等离子体的压力，因为在过去的情况下往往是这样的。本文用数值方法研究了在非无力平衡状态下，突然出现异常电阻率后，有限电流层的快速耗散。本研究的目的是确定在初始扩散阶段能量是如何重新分配的，以及信息和能量向外传递的性质是什么。电阻率在零点处迅速扩散电流。等离子体压力的存在允许绝大多数自由能被转换成内能。大部分转换的能量被用于直接加热周围的等离子体，只有约3%被转换成动能，从而引起磁场和等离子体中的扰动，该扰动以局部快磁声速度传播远离零。由于初始状态的高度非均匀性，脉冲的传播呈现出复杂的结构。它示出，这种扰动进行没有净电流，因为它传播远离零。在本文的假设下，重联中释放的大部分磁能转化为等离子体的内能，这一事实对于色球和日冕加热问题可能是非常重要的。

英文摘要：

Magnetic neutral points, where the magnitude of the magnetic field vanishes locally, are potential locations for energy conversion in the solar corona. The fact that the magnetic field is identically zero at these points suggests that for the study of current sheet formation and of any subsequent resistive dissipation phase, a finite beta plasma should be considered, rather than neglecting the plasma pressure as has often been the case in the past. The rapid dissipation of a finite current layer in non-force-free equilibrium is investigated numerically, after the sudden onset of an anomalous resistivity. The aim of this study is to determine how the energy is redistributed during the initial diffusion phase, and what is the nature of the outward transmission of information and energy. The resistivity rapidly diffuses the current at the null point. The presence of a plasma pressure allows the vast majority of the free energy to be transferred into internal energy. Most of the converted energy is used in direct heating of the surrounding plasma, and only about 3% is converted into kinetic energy, causing a perturbation in the magnetic field and the plasma which propagates away from the null at the local fast magnetoacoustic speed. The propagating pulses show a complex structure due to the highly non-uniform initial state. It is shown that this perturbation carries no net current as it propagates away from the null. The fact that, under the assumptions taken in this paper, most of the magnetic energy released in the reconnection converts internal energy of the plasma, may be highly important for the chromospheric and coronal heating problem.

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