Two-Fluid MHD Simulations of Relativistic Magnetic Reconnection
Two-Fluid MHD Simulations of Relativistic Magnetic Reconnection
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相对论磁重联的二流体 MHD 模拟
DOI：
10.1088/0004-637x/722/1/968
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
A. Klimas
中科院分区：
文献类型：
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作者：
S. Zenitani;M. Hesse;A. Klimas
利用相对论双流体磁流体动力学（MHD）程序研究了正负电子对等离子体中相对论磁场重联的大尺度演化。我们引入一个物种间的摩擦力作为一个有效的电阻率耗散磁场。我们证明了磁重联在我们的双流体系统中成功地发生，并在后期涉及Petschek型分叉电流层。我们进一步观察到一个准稳态的演化由于一个开放的边界条件，并发现Petschek型结构是稳定的，在很长的时间内。模拟结果和理论分析表明，Petschek流出通道变窄时，重联流入包含更多的磁能，如前所述。与此同时，我们发现在极端情况下重连率上升到100%，这比以前认为的要快。的电阻率的作用，影响重联模型中的磁主导的限制，和相关的动力学重联工作进行了讨论。主题词：磁场-相对论-磁流体力学：MHD -等离子体
We investigate the large scale evolution of a relativistic magnetic reconnection in an electron-positron pair plasma by a relativistic two-fluid magnetohydrodynamic (MHD) code. We introduce an inter-species friction force as an effective resistivity to dissipate magnetic fields. We demonstrate that magnetic reconnection successfully occurs in our two-fluid system, and that it involves Petschek-type bifurcated current layers in later stage. We further observe a quasi-steady evolution thanks to an open boundary condition, and find that the Petschek-type structure is stable over the long time period. Simulation results and theoretical analyses exhibit that the Petschek outflow channel becomes narrower when the reconnection inflow contains more magnetic energy, as previously claimed. Meanwhile, we find that the reconnection rate goes up to ∼ 1 in extreme cases, which is faster than previously thought. The role of the resistivity, implications for reconnection models in the magnetically dominated limit, and relevance to kinetic reconnection works are discussed. Subject headings: magnetic fields — relativity — Magnetohydrodynamics: MHD — plasmas