Elongation of Flare Ribbons
Elongation of Flare Ribbons
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DOI：
10.3847/1538-4357/aa6341
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发表时间：
2017-03
期刊：
影响因子：
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通讯作者：
J. Qiu;D. Longcope;P. Cassak;E. Priest
中科院分区：
文献类型：
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作者：
J. Qiu;D. Longcope;P. Cassak;E. Priest
本文分析了耀斑带沿着极性反转线（PIL）的视伸长运动，以及几个双带耀斑环的剪切。耀斑带和环以几公里/秒到一百公里/秒的速度沿着PIL传播。从共轭足点测量的剪切与从耀斑环测量的剪切是一致的，并且两者都显示了随着耀斑的发展以及带状物和环沿着PIL传播，剪切朝向势场的减小。耀斑表现出快速的双向伸长似乎有很强的剪切，这可能表明一个大的磁引导场相对于在日冕电流片的重联领域。我们将讨论如何带运动的分析，可以帮助推断在日冕中发生重连的属性。
We present an analysis of the apparent elongation motion of flare ribbons along the polarity inversion line (PIL), as well as the shear of flare loops in several two-ribbon flares. Flare ribbons and loops spread along the PIL at a speed ranging from a few to a hundred km s−1. The shear measured from conjugate footpoints is consistent with the measurement from flare loops, and both show the decrease of shear toward a potential field as a flare evolves and ribbons and loops spread along the PIL. Flares exhibiting fast bidirectional elongation appear to have a strong shear, which may indicate a large magnetic guide field relative to the reconnection field in the coronal current sheet. We discuss how the analysis of ribbon motion could help infer properties in the corona where reconnection takes place.