Magnetohydrodynamic structure of a plasmoid in fast reconnection in low-beta plasmas: Shock-shock interactions
Magnetohydrodynamic structure of a plasmoid in fast reconnection in low-beta plasmas: Shock-shock interactions
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DOI：
10.1063/1.4916104
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发表时间：
2011-01
影响因子：
2.2
通讯作者：
S. Zenitani;T. Miyoshi
中科院分区：
文献类型：
--
作者：
S. Zenitani;T. Miyoshi
用二维磁流体力学方法研究了低β等离子体中磁重联过程中等离子体团的激波结构。使用具有前所未有的分辨率的高精度代码，冲击，不连续性及其交叉点得到解决和澄清。接触不连续性源自三重激波的交叉点，将不同来源的流体分开。等离子体团内部的冲击钻石似乎使超音速流减速。新的冲击钻石和一个缓慢的膨胀风扇内发现Petschek流出。新的冲击钻石的充分条件和天体物理喷流的相关性进行了讨论。
The shock structure of a plasmoid in magnetic reconnection in low-beta plasmas is investigated by two-dimensional magnetohydrodynamic simulations. Using a high-accuracy code with unprecedented resolution, shocks, discontinuities, and their intersections are resolved and clarified. Contact discontinuities emanate from triple-shock intersection points, separating fluids of different origins. Shock-diamonds inside the plasmoid appear to decelerate a supersonic flow. New shock-diamonds and a slow expansion fan are found inside the Petschek outflow. A sufficient condition for the new shock-diamonds and the relevance to astrophysical jets are discussed.