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首页> 外文期刊>Chinese Journal of Astronomy and Astrophysics >The Relationship between Magnetic Gradient and Magnetic Shear in Five Super Active Regions Producing Great Flares
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The Relationship between Magnetic Gradient and Magnetic Shear in Five Super Active Regions Producing Great Flares

机译:五个产生超大耀斑的超级活跃区域的磁梯度与磁剪切的关系

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摘要

We study the magnetic structure of five well-known active regions that produced great flares (X5 or larger). The six flares under investigation are the X12 flare on 1991 June 9 in AR 6659, the X5.7 flare on 2000 July 14 in AR 9077, the X5.6 flare on 2001 April 6 in AR 9415, the X5.3 flare on 2001 August 25 in AR 9591, the X17 flare on 2003 October 28 and the X10 flare on 2003 October 29, both in AR 10486. The last five events had corresponding LASCO observations and were all associated with Halo CMEs. We analyzed vector magne-tograms from Big Bear Solar Observatory, Huairou Solar Observing Station, Marshall Space Flight Center and Mees Solar Observatory. In particular, we studied the magnetic gradient derived from line-of-sight magnetograms and magnetic shear derived from vector magne-tograms, and found an apparent correlation between these two parameters at a level of about 90%. We found that the magnetic gradient could be a better proxy than the shear for predicting where a major flare might occur: all six flares occurred in neutral lines with maximum gradient. The mean gradient of the flaring neutral lines ranges from 0.14 to 0.50 G km~(-1), 2.3 to 8 times the average value for all the neutral lines in the active regions. If we use magnetic shear as the proxy, the flaring neutral line in at least one, possibly two, of the six events would be mis-identified.
机译:我们研究了五个著名的活动区域的磁结构,这些活动区域产生了耀斑(X5或更大)。所研究的六个耀斑是1991年6月9日在AR 6659中的X12耀斑,2000年7月14日在AR 9077中的X5.7耀斑,2001年4月6日在AR 9415中的X5.6耀斑,2001年在X5.3耀斑8月25日在AR 9591中,2003年10月28日的X17耀斑和2003年10月29日的X10耀斑,都在AR 10486中。最后五个事件具有相应的LASCO观测值,并且都与Halo CME有关。我们分析了大熊太阳观测站,怀柔太阳观测站,马歇尔太空飞行中心和梅斯太阳观测站的矢量磁线图。特别是,我们研究了从视线磁图得出的磁梯度和从矢量磁图得出的磁切变,发现这两个参数之间的表观相关性约为90%。我们发现,在预测可能发生大耀斑的地方,磁性梯度可能比剪切力更好:所有六个耀斑都发生在具有最大梯度的中性线中。向外张开的中性线的平均梯度为0.14至0.50 G km〜(-1),是活动区域中所有中性线平均值的2.3至8倍。如果我们使用电磁剪切作为代理,那么六个事件中至少一个(可能是两个)中的向外张开的中线会被错误地识别。

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