The dependence of large flare occurrence on the magnetic structure of sunspots
The dependence of large flare occurrence on the magnetic structure of sunspots
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DOI：
10.1086/309303
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发表时间：
2000-09-01
影响因子：
4.9
通讯作者：
Zirin, H
中科院分区：
文献类型：
--
作者：
Sammis, I;Tang, F;Zirin, H
我们研究了由NOAA世界数据中心提供的美国空军/威尔逊山资料集的8年活动区观测资料，以确认三角洲黑子与大耀斑之间的关系。我们发现，在纠正一些错误后，我们能够描述活动区域的大小，峰值耀斑软X射线（SXR）通量（测量GOES 1-8埃通量）和磁性分类之间的关系。我们发现太阳光学观测网络的磁分类是相当准确的，但其面积的措施是不准确的许多地区。这部分是由于抄写错误，部分是由于错误的肢体缩短校正。然而，错误可以通过相互比较多个观测值来修复。我们证实了Kunzel的原始想法，分类β-伽马-δ的区域比其他类似大小的区域产生更多的大耀斑。几乎所有的重大耀斑都发生在空军基地划分为β-γ-δ的区域。每一个大于1000亩小时和分类β-伽马-三角洲地区有近40%的概率产生耀斑分类X1或更大。然而，其中只有六个显示出“岛屿三角洲”结构的区域产生了巨大的活动。大区域产生大耀斑的总趋势是存在的，但与对磁类的依赖相比，这种趋势不那么显著。
We have studied 8 yr of active region observations from the United States Air Force/Mount Wilson data set, supplied by the NOAA World Data Center, to confirm the relation between delta spots and large flares. We found that after correcting some errors we were able to describe relationships among active region size, peak flare soft X-ray (SXR) flux (measured by GOES 1-8 Angstrom flux), and magnetic classification. We found the Solar Optical Observing Network magnetic classification to be reasonably accurate but its area measures to be inaccurate for many of the regions. This is due partly to transcription errors and partly to wrong correction for limb foreshortening. Errors could however, be repaired by intercomparison of multiple observations. We confirm Kunzel's original idea that regions classified beta gamma delta produce many more large flares than other regions of comparable size. Almost all substantial flares occurred in regions classified beta gamma delta by the Air Force sites. Each region larger than 1000 mu h and classified beta gamma delta had nearly 40% probability of producing flares classified X1 or greater. Yet only a half-dozen of those, showing the "island delta" configuration, produced great activity. There is a general trend for large regions to produce large flares, but it is less significant than the dependence on magnetic class.