一个S形电流带上的太阳耀斑爆发
摘要
2017年9月6日08:57UT位于日面西南方向的活动区NOAA AR12673上爆发了一个X2.2级的耀斑.应用SDO(Solar Dynamics Observatory,SDO)/HMI(Helioseismic and Magnetic Imager,HMI)观测到的矢量磁图,我们计算出了活动区在耀斑爆发前一时刻的视向电流分布图.结果显示,在该活动区的磁中性线上存在一条高密度的S形长电流带.SDO/AIA(Atmospheric Imaging Assembly,AIA)在EUV和可见光波段观测的图像显示耀斑首先在电流带上形成一个亮点,此后几乎严格沿着电流带向两端迅速发展,最终形成一个与电流带形态极为相似的耀斑带,这种相似关系暗示着耀斑爆发可能与活动区内电流分布特征存在某种紧密关系。
引文
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[2]Sun,X.,Hoeksema,J.T.,Liu,Y.,et al.Evolution of Magnetic Field and Energy in a Major Eruptive Active Region Based on SDO/HMI Observation 2012,ApJ,748,77
[3]Song,Q.,Zhang,J.,Yang,S.-H.,Liu,Y.Flares and nonpotentiality of AR 11158 2013IAUS..294..573S
[4]Yang S,Zhang J,Zhu X,et al.Block-induced complex structures building the flare-productive solar active region12673[J].Astrophysical Journal,2017,833(2):L18.