Computer simulations on three‐dimensional plasmoid dynamics by the spontaneous fast reconnection model
Computer simulations on three‐dimensional plasmoid dynamics by the spontaneous fast reconnection model
复制标题
自发快速重联模型对三维等离子体动力学的计算机模拟
DOI：
10.1029/97ja01646
复制
发表时间：
1998
影响因子：
--
通讯作者：
W. B. Wang
中科院分区：
文献类型：
--
作者：
M. Ugai;W. B. Wang
本文通过将 (x, y) 平面 [Ugai, 1995b] 中的二维等离子体团研究扩展到 z（黎明-黄昏）方向，将自发快速重联模型应用于三维 (3-D) 等离子体团动力学。随着快速重联的自发发展，大规模等离子体团通过长电流片系统演化和传播。等离子体团周围存在大规模的涡旋等离子体流，因此由于等离子体团后方的中心z = 0（即（x，y））平面的会聚流，所产生的等离子体团被显着限制在有限的内部区域（在z方向）。沿着由此产生的等离子体边界层，慢激波和有限振幅中间波同时存在。 （纯）有限振幅中间波位于慢激波之前，因此剪切场与流动分量 Bz 和 uz 之间存在良好的相关性。初始（一维）片状电流在内部快速重联和等离子体团区域中被剧烈破坏，并且流入内部区域的电流很大程度上分叉并集中到慢激波和等离子体团边界层中。 3-D 等离子体团结构非常复杂，以至于 Bz（黎明-黄昏）场分量可能会发生单极或双极变化，具体取决于在 x 方向观察等离子体团的路径。提出自发快速重连模型可以合理地应用于亚暴。
The present paper applies the spontaneous fast reconnection model to the three-dimensional (3-D) plasmoid dynamics by extending our 2-D plasmoid study in the (x, y) plane [Ugai, 1995b] to the z (dawn-dusk) direction. As the fast reconnection spontaneously develops, a large-scale plasmoid evolves and propagates through a long current sheet system. There is a large-scale vortex plasma flow around the plasmoid, so that the resulting plasmoid is significantly confined in a limited inner region (in the z direction) because of the converging flow toward the central z = 0 (i.e., (x, y)) plane in the backward of the plasmoid. Along the resulting plasmoid boundary layer, slow shocks and finite amplitude intermdediate waves simultaneously stand. A (pure) finite amplitude intermediate wave stands just ahead of the slow shock, so that there is a good correlation between the sheared field and flow components Bz and uz. The initial (one-dimensional) sheet current is drastically disrupted in the inner fast reconnection and plasmoid regions, and the current flowing into the inner region is largely bifurcated and concentrated into the slow shock and plasmoid boundary layers. The 3-D plasmoid structure is so complicated that the Bz (dawn-dusk) field component may have a monopolar-like or bipolar-like change depending on the path through which the plasmoid is observed in the x direction. It is proposed that the sponaneous fast reconnection model can reasonably be applied to substorms.
DOI：
--
发表时间：
2005
期刊：
Phys. Plasmas Vol.12
影响因子：
--
作者：
Y.Fujiyoshi;K.Yoshida;R.Enomoto et al.;Hisao Komatsu (小松久男);M.Ugai.他
通讯作者：
M.Ugai.他