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首页> 外文期刊>The Astrophysical journal >BRAIDING-INDUCED INTERCHANGE RECONNECTION OF THE MAGNETIC FIELD AND THE WIDTH OF SOLAR CORONAL LOOPS
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BRAIDING-INDUCED INTERCHANGE RECONNECTION OF THE MAGNETIC FIELD AND THE WIDTH OF SOLAR CORONAL LOOPS

机译：磁场引起的辫状交换互换和日冕环的宽度

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摘要

The random walk of the footpoints of coronal loops in the rapidly evolving solar granulation is expected to cause braiding of the field, which in turn should lead to a multitude of coronal reconnection events. Consequently, plasma volumes in coronal loops should repeatedly be spliced onto parts of other such loop structures within their lifetime in the corona. Both heat and plasma can thereby in effect be dispersed perpendicular to the field's guide direction, leading to an increase of loop width with time. I show that observed loop cross sections are consistent with this process for a reconnection-induced dispersal coefficient of 93 ± 9 km~2 s~(-1), which equals the dispersal coefficient that characterizes the granular random walk up to several hours. Loop width observations thus offer support for the hypothesis that granular braiding is countered statistically by frequent coronal recon-nections, which in turn explains the general absence of entangled coronal field structures in high-resolution observations of the quiescent solar corona. This finding suggests that reconnection-enabled cross-field plasma dispersal needs to be included in models of coronal loop atmospheres.
机译：在迅速发展的太阳造粒过程中，冠状环的脚点的随机游走预计会导致磁场编织，这反过来又会导致许多冠状体再连接事件。因此，冠状环中的血浆体积应在其在电晕中的寿命内重复地拼接到其他此类环结构的部分上。因此，热量和等离子体实际上都可以垂直于磁场的引导方向分散，从而导致回路宽度随时间增加。我发现观察到的环路横截面与该过程一致，因为重新连接引起的分散系数为93±9 km〜2 s〜（-1），该分散系数等于表征长达数小时的随机随机游走的分散系数。因此，圈宽观测结果为以下事实提供了支持：粒状编织在统计学上被频繁的日冕重合所抵消，这反过来解释了在静态太阳日冕的高分辨率观测中普遍不存在日冕场结构纠缠的情况。这一发现表明，在冠状环大气模型中需要包括能够重新连接的跨场等离子体扩散。

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