NUMERICAL SIMULATION OF THREE-DIMENSIONAL ASYMMETRIC RECONNECTION AND APPLICATION TO A PHYSICAL MECHANISM OF PENUMBRAL MICROJETS
NUMERICAL SIMULATION OF THREE-DIMENSIONAL ASYMMETRIC RECONNECTION AND APPLICATION TO A PHYSICAL MECHANISM OF PENUMBRAL MICROJETS
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DOI：
10.1088/0004-637x/761/2/87
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发表时间：
2012-11
期刊：
影响因子：
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通讯作者：
N. Nakamura;K. Shibata;H. Isobe
中科院分区：
文献类型：
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作者：
N. Nakamura;K. Shibata;H. Isobe
利用三维磁流体动力学模拟方法研究了磁场重联场线不完全反平行的三维分量重联。特别地，我们考虑了重连场线的场强的不对称性。随着不对称性的增加，产生的重联射流往往是平行于更强的场线。这是因为较弱的场线在初始平衡中具有较高的气体压力，并且因此沿着重新连接的场线产生气体压力梯度，这加速了场对准的等离子体流。这一机制可以解释半影微射流和其他类型的平行于磁场线的射流。
Three-dimensional (3D) component reconnection, where reconnecting field lines are not perfectly anti-parallel, is studied with a 3D magnetohydrodynamic simulation. In particular, we consider the asymmetry of the field strength of the reconnecting field lines. As the asymmetry increases, the generated reconnection jet tends to be parallel to stronger field lines. This is because weaker field lines have higher gas pressure in the initial equilibrium, and hence the gas pressure gradient along the reconnected field lines is generated, which accelerates the field-aligned plasma flow. This mechanism may explain penumbral microjets and other types of jets that are parallel to magnetic field lines.