TWO-FLUID SIMULATIONS OF COALESCING PENUMBRA FILAMENTS DRIVEN BY NEUTRAL-HYDROGEN FLOWS
TWO-FLUID SIMULATIONS OF COALESCING PENUMBRA FILAMENTS DRIVEN BY NEUTRAL-HYDROGEN FLOWS
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DOI：
10.1088/0004-637x/691/1/l45
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发表时间：
2009-01
期刊：
影响因子：
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通讯作者：
J. Sakai;P. Smith
中科院分区：
文献类型：
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作者：
J. Sakai;P. Smith
我们研究了中性氢流驱动的两个半影丝的合并。我们研究了改变初始碰撞速度和轴向电流强度对磁重联率的影响。我们使用一个双流体（离子中性）的数值代码来模拟质子和中性氢粒子，通过质子/中性氢碰撞耦合的三维动力学。结果表明，初始碰撞速度对磁重联率有很大的影响。初始碰撞速度相当于声速的10%，与自发聚结相比，磁重联率增加了50倍。我们的结论是，弱的光球中性氢流可以大大增强合并半影暗条的磁重联率。
We study the coalescence of two penumbra filaments driven by neutral-hydrogen flows. We investigate the effects of changing the initial collision velocity and axial current intensity on the magnetic reconnection rates. We use a two-fluid (ion–neutral) numerical code to model the three-dimensional dynamics of protons and neutral-hydrogen particles, which couple through proton/neutral-hydrogen collisions. It is found that the magnetic reconnection rate of the coalescing penumbral filaments is strongly enhanced by an initial collision velocity. An initial collision velocity corresponding to 10% of the sound speed increases the magnetic reconnection rate by a factor of 50 when compared to spontaneous coalescence. We conclude that the magnetic reconnection rate of coalescing penumbra filaments can be strongly enhanced by weak photospheric neutral-hydrogen flows.