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arXiv 1606.08264astro-ph.SR
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2011年6月7日爆发暗条的通量抵消和演化

Flux cancellation and the evolution of the eruptive filament of 2011 June 7

S. L. Yardley, L. M. Green, D. R. Williams, L. van Driel-Gesztelyi, G. Valori, S. Dacie

摘要:

我们调查是否通量取消是负责形成一个非常大规模的灯丝,导致壮观的2011年6月7日爆发。我们使用日光层磁成像仪的视线磁图分析和量化了NOAA AR 11226及其两个相邻AR(11227和11233)中发生的通量抵消量。在暗条爆发前的3.6天时间里,1.7 x 10^21 Mx,即AR 11226最大磁通量的21%,沿着暗条形成的极性反转线(PIL)被抵消。如果通量抵消以相同的速率持续到爆发,那么包含丝状等离子体的磁位形中可能已经形成了高达2.8 x 10^21 Mx(AR通量的34%)的磁场。大的通量抵消率是由于一个不寻常的运动的正极性太阳黑子,分裂,与最大的部分迅速向PIL移动。这种运动压缩了负极性,并导致形成一个孤立的半影,其中一端的灯丝扎根。密集的等离子体线程以上的孤儿半影建立到灯丝,延长其长度,并推测注入到it.We得出结论,异常强大的流量抵消AR 11226中发挥了重要作用,在其异常巨大的灯丝的形成。此外,沿PIL的矢量磁场中秃斑的存在和相干演化表明,支持灯丝材料的磁场配置是通量绳。

英文摘要:

We investigate whether flux cancellation is responsible for the formation of a very massive filament resulting in the spectacular 2011 June 7 eruption. We analyse and quantify the amount of flux cancellation that occurs in NOAA AR 11226 and its two neighbouring ARs (11227 & 11233) using line-of-sight magnetograms from the Heliospheric Magnetic Imager. During a 3.6-day period building up to the filament eruption, 1.7 x 10^21 Mx, 21% of AR 11226's maximum magnetic flux, was cancelled along the polarity inversion line (PIL) where the filament formed. If the flux cancellation continued at the same rate up until the eruption then up to 2.8 x 10^21 Mx (34% of the AR flux) may have been built into the magnetic configuration that contains the filament plasma. The large flux cancellation rate is due to an unusual motion of the positive polarity sunspot, which splits, with the largest section moving rapidly towards the PIL. This motion compresses the negative polarity and leads to the formation of an orphan penumbra where one end of the filament is rooted. Dense plasma threads above the orphan penumbra build into the filament, extending its length, and presumably injecting material into it. We conclude that the exceptionally strong flux cancellation in AR 11226 played a significant role in the formation of its unusually massive filament. In addition, the presence and coherent evolution of bald patches in the vector magnetic field along the PIL suggests that the magnetic field configuration supporting the filament material is that of a flux rope.

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