CRITICAL DIFFERENCES OF ASYMMETRIC MAGNETIC RECONNECTION FROM STANDARD MODELS

CRITICAL DIFFERENCES OF ASYMMETRIC MAGNETIC RECONNECTION FROM STANDARD MODELS
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不对称磁重联与标准模型的关键区别

DOI:
10.3847/0004-637x/828/1/63
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发表时间:
2016
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
K. Kondoh
K. Kondoh
中科院分区:
--
文献类型:
--
作者:
S. Nitta;T. Wada;T. Fuchida;K. Kondoh

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我们详细地阐明了非对称磁重联的结构是自发演化过程的结果。非对称性被施加为在等温平衡中的初始电流片(CS)两侧的磁场强度的比率k。用HLLD程序对磁流体动力学进行了模拟,得到了具有很高空间分辨率的长期时间演化。所得到的结构与对称的情况(例如,Petschek模型),甚至对于轻微不对称k = 2。(1)重联喷流中的速度分布清楚地显示出两层结构,即,其中流动几乎是场对准的高速子层和加速子层。(2)高β侧(HBS)等离子体被捕获在低β侧等离子体团中。这表明在重联事件中有一个新的等离子体混合过程。(3)在等离子体团前形成一个新的大的强快激波。这可能是重联系统中一个新的粒子加速场。这些关键属性,没有在以前的工作中报告,表明我们有助于更好地和更详细的知识的对称磁重联系统的标准模型的重联。
We have clarified the structure of asymmetric magnetic reconnection in detail as the result of the spontaneous evolutionary process. The asymmetry is imposed as ratio k of the magnetic field strength in both sides of the initial current sheet (CS) in the isothermal equilibrium. The MHD simulation is carried out by the HLLD code for the long-term temporal evolution with very high spatial resolution. The resultant structure is drastically different from the symmetric case (e.g., the Petschek model) even for slight asymmetry k = 2. (1) The velocity distribution in the reconnection jet clearly shows a two-layered structure, i.e., the high-speed sub-layer in which the flow is almost field aligned and the acceleration sub-layer. (2) Higher beta side (HBS) plasma is caught in a lower beta side plasmoid. This suggests a new plasma mixing process in the reconnection events. (3) A new large strong fast shock in front of the plasmoid forms in the HBS. This can be a new particle acceleration site in the reconnection system. These critical properties that have not been reported in previous works suggest that we contribute to a better and more detailed knowledge of the reconnection of the standard model for the symmetric magnetic reconnection system.
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影响因子: 2.2
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