Magnetic Reconnection in Strongly Magnetized Regions of the Low Solar Chromosphere
Magnetic Reconnection in Strongly Magnetized Regions of the Low Solar Chromosphere
复制标题
低太阳色球层强磁化区域的磁重联
DOI：
10.3847/1538-4357/aa9edb
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发表时间：
2017-12
期刊：
影响因子：
--
通讯作者：
Lin Jun
中科院分区：
文献类型：
--
作者：
Ni Lei;Lukin Vyacheslav S.;Murphy Nicholas A.;Lin Jun
通过在反应性 2.5D 多流体模型中采用基于 MHD 的部分电离等离子体模拟，研究了低太阳大气温度最低区域周围强磁化区域的磁重联。结果表明，在低 β 等离子体中不存在磁零点的情况下，电离流体流和中性流体流在整个重联区域中耦合良好。然而，非平衡电离复合动力学在确定重联区域的结构中起着至关重要的作用，与假设等离子体处于电离复合平衡的模拟相比，它会导致更低的温度升高和更快的磁重联速率。即使初始等离子体β高达{β}0=1.46，等离子体中性成分的电离速率也始终快于当前片区域内的复合速率。当重联磁场超过千高斯且等离子体β低于0.0145时，最初弱电离的等离子体可以在重联区域内完全电离，并且电流片可以被强烈加热到2.5×{10}4K以上，即使大部分碰撞耗散的磁能被辐射掉。霍尔效应稍微增加了重联率，但在没有磁零点的情况下，它不会导致显着的不对称性或将重联电流片的特性改变到米级。
Magnetic reconnection in strongly magnetized regions around the temperature minimum region of the low solar atmosphere is studied by employing MHD-based simulations of a partially ionized plasma within a reactive 2.5D multi-fluid model. It is shown that in the absence of magnetic nulls in a low β plasma, the ionized and neutral fluid flows are well-coupled throughout the reconnection region. However, non-equilibrium ionization-recombination dynamics play a critical role in determining the structure of the reconnection region, leading to much lower temperature increases and a faster magnetic reconnection rate as compared to simulations that assume plasma to be in ionization-recombination equilibrium. The rate of ionization of the neutral component of the plasma is always faster than recombination within the current sheet region even when the initial plasma β is as high as {β }0=1.46. When the reconnecting magnetic field is in excess of a kilogauss and the plasma β is lower than 0.0145, the initially weakly ionized plasmas can become fully ionized within the reconnection region and the current sheet can be strongly heated to above 2.5× {10}4 K, even as most of the collisionally dissipated magnetic energy is radiated away. The Hall effect increases the reconnection rate slightly, but in the absence of magnetic nulls it does not result in significant asymmetries or change the characteristics of the reconnection current sheet down to meter scales.
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DOI：
10.1086/168989
发表时间：
1990-07
期刊：
The Astrophysical Journal
影响因子：
--
作者：
W. Gan;C. Fang
通讯作者：
W. Gan;C. Fang
DOI：
--
发表时间：
2016-08
期刊：
arXiv: Plasma Physics
影响因子：
--
作者：
V. Lukin;A. Glasser;W. Lowrie;E. Meier
通讯作者：
V. Lukin;A. Glasser;W. Lowrie;E. Meier
观察太阳灯丝喷发中磁重联释放扭曲
影响因子：
16.6
作者：
Xue Z;Yan X;Cheng X;Yang L;Su Y;Kliem B;Zhang J;Liu Z;Bi Y;Xiang Y;Yang K;Zhao L
通讯作者：
Zhao L
影响因子：
2.2
作者：
J. Leake;V. Lukin;M. Linton
通讯作者：
J. Leake;V. Lukin;M. Linton
DOI：
10.3847/1538-4357/aa6844
发表时间：
2017-04
期刊：
The Astrophysical Journal
影响因子：
--
作者：
V. Hansteen;V. Archontis;T. Pereira;M. Carlsson;L. R. van der Voort;J. Leenaarts
通讯作者：
V. Hansteen;V. Archontis;T. Pereira;M. Carlsson;L. R. van der Voort;J. Leenaarts