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arXiv physics/0701197physics.plasm-phastro-phphysics.space-ph
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三维磁零点处的电流片:可压缩性的影响

Current sheets at three-dimensional magnetic nulls: Effect of compressibility

D. I. Pontin, A. Bhattacharjee, K. Galsgaard

摘要:

研究了三维磁零点附近电流片形成的性质。特别关注的是对电流片的定性和定量性质的等离子体的可压缩性的效果。如在先前的论文[Pontin等人,等离子体,出版中(2007)]。结果发现,随着不可压缩极限的接近,零点的崩溃被抑制,而近似平面的电流片对准的扇平面。无论空值的脊或扇是否被剪切,情况都是如此。峰值电流和峰值重连率都降低了。的结果有关系在不可压缩等离子体中的稳态重联以前的解析解,这意味着风扇电流片的解决方案是动态访问,而脊柱电流片的解决方案是没有。

英文摘要:

The nature of current sheet formation in the vicinity of three-dimensional (3D) magnetic null points is investigated. The particular focus is upon the effect of the compressibility of the plasma on the qualitative and quantitative properties of the current sheet. An initially potential 3D null is subjected to shearing perturbations, as in a previous paper [Pontin et al., Phys. Plasmas, in press (2007)]. It is found that as the incompressible limit is approached, the collapse of the null point is suppressed, and an approximately planar current sheet aligned to the fan plane is present instead. This is the case regardless of whether the spine or fan of the null is sheared. Both the peak current and peak reconnection rate are reduced. The results have a bearing on previous analytical solutions for steady-state reconnection in incompressible plasmas, implying that fan current sheet solutions are dynamically accessible, while spine current sheet solutions are not.

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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