arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0912.4552physics.plasm-phphysics.space-ph
收藏

流出方向不对称的磁重联

Magnetic Reconnection with Asymmetry in the Outflow Direction

N. A. Murphy, C. R. Sovinec, P. A. Cassak

摘要:

流出方向不对称的磁重联发生在地球的磁尾、日冕物质抛射、通量抵消事件、天体物理盘、球马克合并实验以及自然界和实验室的其他地方。控制体积分析的情况下,进行稳定的反平行磁重联与不对称的下游压力,这是用来推导出的比例关系的流出速度从每一侧的电流片和重联率。对于不可压缩的情况和下游压力对称但下游密度不对称的情况,给出了流出速度的简单关系式。单独的不对称性并没有被发现对重连率有很大影响。在稳定状态下,流动停滞点和磁场零点不重合,除非在流动停滞点处的压力梯度可以忽略。

英文摘要:

Magnetic reconnection with asymmetry in the outflow direction occurs in the Earth's magnetotail, coronal mass ejections, flux cancellation events, astrophysical disks, spheromak merging experiments, and elsewhere in nature and the laboratory. A control volume analysis is performed for the case of steady antiparallel magnetic reconnection with asymmetric downstream pressure, which is used to derive scaling relations for the outflow velocity from each side of the current sheet and the reconnection rate. Simple relationships for outflow velocity are presented for the incompressible case and the case of symmetric downstream pressure but asymmetric downstream density. Asymmetry alone is not found to greatly affect the reconnection rate. The flow stagnation point and magnetic field null do not coincide in a steady state unless the pressure gradient is negligible at the flow stagnation point.

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。

↑