Impulsive Variations of the Magnetic Helicity Change Rate Associated with Eruptive Flares
Impulsive Variations of the Magnetic Helicity Change Rate Associated with Eruptive Flares
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DOI：
10.1086/343130
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发表时间：
2002-11
期刊：
影响因子：
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通讯作者：
Y. Moon;J. Chae;Haimin Wang;G. Choe;Y. Park
中科院分区：
文献类型：
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作者：
Y. Moon;J. Chae;Haimin Wang;G. Choe;Y. Park
本文研究了伴随晕日冕物质抛射的爆发性太阳耀斑（三个X级耀斑和一个M级耀斑）的磁螺旋度变化率的脉冲变化。通过分析太阳和日光层天文台上的迈克尔逊多普勒成像仪拍摄的四组1分钟节奏的全圆盘磁图，我们确定了由于水平光球运动引起的磁螺旋度输运率。我们发现，磁螺旋度的数量级为1041 Mx ~ 2的脉冲注入到日冕周围的耀斑的耀斑峰值时间。我们还发现，脉冲注入的磁螺旋度与伴随耀斑的X射线峰值通量之间存在正相关关系。脉冲螺旋度的变化归因于本地化的极性反转线附近的水平速度内核。最后，我们报告说，有一个密切的空间接近的水平速度内核和Hα亮点。
In this paper, we investigate impulsive variations of the magnetic helicity change rate associated with eruptive solar flares (three X class flares and one M class flare) accompanying halo coronal mass ejections. By analyzing four sets of 1 minute cadence full-disk magnetograms taken by the Michelson Doppler Imager on board the Solar and Heliospheric Observatory, we have determined the rates of magnetic helicity transport due to horizontal photospheric motions. We have found that magnetic helicity of the order of 1041 Mx2 was impulsively injected into the corona around the flaring peak time of all the flares. We also found that there is a positive correlation between the impulsively injected magnetic helicity and the X-ray peak flux of the associated flare. The impulsive helicity variations are attributed to horizontal velocity kernels localized near the polarity inversion lines. Finally, we report that there is a close spatial proximity between the horizontal velocity kernels and Hα bright points.