斑片重连后的密度增强和空洞
Density Enhancements and Voids following Patchy Reconnection
摘要：
我们表明，通过一个简单的补丁重连模型，收回重连通量管可能会出现细长的区域相对缺乏等离子体，以及持久的，密集的中心热区域。假设重新连接发生在具有偏斜磁场的Syrovatskií（非均匀）电流片（CS）上的小块中。背景磁压在CS平面中心处最大，向边缘逐渐减小。重连贴片产生两个V形重连管，由于磁张力，它们在相反方向缩回时缩短。其中一个向上移动到CS的顶部边缘，另一个向下移动到底层拱廊的顶部。旋转不连续性（RD）沿管腿传播，并产生平行的超音速流，在管的中心碰撞。在那里，压缩和加热等离子体的气体动力学冲击向外发射。下降管移动通过CS的底部，在那里它响应于背景磁压力而横向膨胀。该效应可使等离子体密度降低背景水平的30%至50%。这条管子将到达拱廊的顶部，这将使它减速到一个停止。在这里，垂直动力学停止了，但平行动力学继续沿着它的腿; RD关闭，气体稀薄到更低的密度。热的震后区域继续发展，决定了拱廊顶部的一个长期持续的热区域。我们提供了一个观测方法的基础上，总排放量的措施和平均温度，这表明在CS管已重新连接。
英文摘要：
We show, through a simple patchy reconnection model, that retracting reconnected flux tubes may present elongated regions relatively devoid of plasma, as well as long lasting, dense central hot regions. Reconnection is assumed to happen in a small patch across a Syrovatskií (non-uniform) current sheet (CS) with skewed magnetic fields. The background magnetic pressure has its maximum at the center of the CS plane, and decreases toward the edges of the plane. The reconnection patch creates two V-shaped reconnected tubes that shorten as they retract in opposite directions, due to magnetic tension. One of them moves upward toward the top edge of the CS, and the other one moves downward toward the top of the underlying arcade. Rotational discontinuities (RDs) propagate along the legs of the tubes and generate parallel super-sonic flows that collide at the center of the tube. There, gas dynamics shocks that compress and heat the plasma are launched outwardly. The descending tube moves through the bottom part of the CS where it expands laterally in response to the background magnetic pressure. This effect may decrease plasma density by 30 % to 50 % of background levels. This tube will arrive at the top of the arcade that will slow it down to a stop. Here, the perpendicular dynamics is halted, but the parallel dynamics continues along its legs; the RDs are shut down, and the gas is rarified to even lower densities. The hot postshock regions continue evolving, determining a long lasting hot region on top of the arcade. We provide an observational method based on total emission measure and mean temperature, that indicates where in the CS the tube has been reconnected.
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