粘性和热传导促进磁重联
Boosting Magnetic Reconnection by Viscosity and Thermal Conduction
摘要：
利用磁流体动力学模拟方法研究了磁重联的非线性演化，包括均匀电阻率、均匀粘性和各向异性热传导。当粘性超过电阻率（磁普朗特数Prm > 1）时，粘性耗散主导流出动力学，并导致电流片内等离子体密度的降低。低密度电流片支持涡旋的激发。当Prm > 1时，涡旋的厚度比海流的厚度宽.更宽的涡流更有效地将上游的磁通量携带到重联区域，从而促进重联。假设热传导足够快以带走由粘性耗散增加的热能（流体普朗特数Pr < 1），则重连率随粘性增加。结果表明，需要控制的普朗特数的重联对传统的电阻模型。
英文摘要：
Nonlinear evolution of magnetic reconnection is investigated by means of magnetohydrodynamic simulations including uniform resistivity, uniform viscosity, and anisotropic thermal conduction. When viscosity exceeds resistivity (the magnetic Prandtl number Prm > 1), the viscous dissipation dominates outflow dynamics and leads to the decrease in the plasma density inside a current sheet. The low-density current sheet supports the excitation of the vortex. The thickness of the vortex is broader than that of the current for Prm > 1. The broader vortex flow more efficiently carries the upstream magnetic flux toward the reconnection region, and consequently boosts the reconnection. The reconnection rate increases with viscosity provided that thermal conduction is fast enough to take away the thermal energy increased by the viscous dissipation (the fluid Prandtl number Pr < 1). The result suggests the need to control the Prandtl numbers for the reconnection against the conventional resistive model.
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