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arXiv 1502.05157astro-ph.SR
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太阳活动区2192的X级禁闭耀斑

The Confined X-class Flares of Solar Active Region 2192

J. K. Thalmann, Y. Su, M. Temmer, A. M. Veronig

摘要:

2014年10月观测到的异常大的NOAA活动区2192,在没有日冕物质抛射的情况下,其主要双带耀斑的生产力非常突出。在一个大的规模上,一个主要的南北向磁系统的拱廊场作为一个强大的,也是横向的,限制了一系列的大型双带耀斑起源于核心的活动区。耀斑带的大的初始分离,加上几乎没有增长的带分离,表明一个封闭的重联网站在日冕的高处。本文通过对10月22日发生的X1.6级局限性耀斑的详细分析,说明了该活动区的耀斑异常。我们提供了重复能量释放的证据,表明相同的磁场结构重复参与了磁重联。我们发现,大量的电子被加速到非热能,揭示了陡峭的幂律谱,但只有一小部分被加速到高能量。导出的电子中的总非热能(约为10^25 J)比X1类爆发耀斑中的能量高得多,相当于活动区日冕中过剩磁能的10%左右。

英文摘要:

The unusually large NOAA active region 2192, observed in October 2014, was outstanding in its productivity of major two-ribbon flares without coronal mass ejections. On a large scale, a predominantly north-south oriented magnetic system of arcade fields served as a strong, also lateral, confinement for a series of large two-ribbon flares originating from the core of the active region. The large initial separation of the flare ribbons, together with an almost absent growth in ribbon separation, suggests a confined reconnection site high up in the corona. Based on a detailed analysis of the confined X1.6 flare on October 22, we show how exceptional the flaring of this active region was. We provide evidence for repeated energy release, indicating that the same magnetic field structures were repeatedly involved in magnetic reconnection. We find that a large number of electrons was accelerated to non-thermal energies, revealing a steep power law spectrum, but that only a small fraction was accelerated to high energies. The total non-thermal energy in electrons derived (on the order of 10^25 J) is considerably higher than that in eruptive flares of class X1, and corresponds to about 10\% of the excess magnetic energy present in the active-region corona.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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