Magnetic field-line reconnexion by localized enhancement of resistivity. Part 2. Quasi-steady process
Magnetic field-line reconnexion by localized enhancement of resistivity. Part 2. Quasi-steady process
复制标题
通过局部增强电阻率来重新连接磁场线。
DOI：
10.1017/s0022377800023503
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发表时间：
1977
影响因子：
2.5
通讯作者：
M. Ugai
中科院分区：
文献类型：
--
作者：
T. Tsuda;M. Ugai
我们在前面已经描述了通过电阻率局部增强进行磁力线反演的演化过程。在本文中，它是由数值实验表明，最终检查的演变，与系统达到一个准稳态。在从初始反平行磁场建立的准稳态组态的基础上，我们现在可以分别阐明扩散、场反转和外部区域的MHD特性，以及它们之间的相互依赖性。特别是，在扩散区的物理过程是值得注意的，因为目前的侦察过程的最终原因是弯曲的磁力线向磁中性点，这是由于局部增强电阻率假设在扩散区。本文的数值计算结果与稳态侦察的解析结果基本一致，但由于两者假设的基本情况不同，存在一些差异。它指出，在整个场反转区的边界上的流动特性的变化同意以及与所需的慢模式压缩波和外部区域中的主导过程对应于一个快速的模式扩展。
We have described previously the evolutionary process of magnetic field-line reconnexion by a localized enhancement of resistivity. In this paper, it is demonstrated by numerical experiment that the evolution is eventually checked, with the system attaining a quasi-steady state. On the basis of the quasi-steady configuration, established from an initially antiparallel magnetic field, we can now clarify the MHD properties that are characteristic of the diffusion, field reversal and external regions, respectively, and then the mutual dependence among them. Especially, the physical processes in the diffusion region are noteworthy, since the ultimate cause for the present reconnexion process is the bending of the field lines towards the magnetic neutral point, which results from the locally enhanced resistivity assumed in the diffusion region. The present numerical results generally agree with the analytical results for the steady reconnexion, although some discrepancies exist owing to the differences of the postulated basic situations between them. It is pointed out that changes in flow properties across the boundary of the field reversal region agree well with those required for a slow mode compression wave and that the dominant process in the external region corresponds to a fast mode expansion.