由于局部脉冲重联后的收缩引起的耀斑后环的气体动力冲击加热
Gas-dynamic shock heating of post-flare loops due to retraction following localized, impulsive reconnection
摘要：
我们提出了一个新的模型，其中缩短的磁通量管本地化，三维重联产生强大的气体动力学冲击周围的顶点。缩短过程以阿尔芬速度离开重联点释放磁能。这会沿着磁力线向内发射气流，它们的碰撞会产生一对气体动力学冲击。冲击使新缩短的通量管内的质量密度和温度都升高。重新连接初始方向相差超过100度的场线可以产生一个集中的等离子体结，其温度超过20 MK，与观测结果一致。尽管温度很高，但冲击波将不到10%的释放的磁能转化为热量，其余的则作为整体运动的动能保留下来。这些气体动力学冲击只出现在重联是脉冲和本地化的所有三个维度，他们是不同的慢磁声冲击的Petschek稳态重联模型。
英文摘要：
We present a novel model in which shortening of a magnetic flux tube following localized, three-dimensional reconnection generates strong gas-dynamic shocks around its apex. The shortening releases magnetic energy by progressing away from the reconnection site at the Alfven speed. This launches inward flows along the field lines whose collision creates a pair of gas-dynamic shocks. The shocks raise both the mass density and temperature inside the newly shortened flux tube. Reconnecting field lines whose initial directions differ by more that 100 degrees can produce a concentrated knot of plasma hotter that 20 MK, consistent with observations. In spite of these high temperatures, the shocks convert less than 10% of the liberated magnetic energy into heat - the rest remains as kinetic energy of bulk motion. These gas-dynamic shocks arise only when the reconnection is impulsive and localized in all three dimensions; they are distinct from the slow magnetosonic shocks of the Petschek steady-state reconnection model.
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