与耀斑双带重合的一对共轭电流带

A Pair of Conjugate Current Bands Coinciding with the Double Bands of Flare

利用SDO (Solar Dynamics Observatory)/HMI (Helioseismic and Magnetic Imager)观测到的矢量磁图,研究了与活动区AR12673上爆发的一个X9.3级耀斑(2017年9月6日)的相关电流分布和演化.结果显示,在该活动区的磁中性线两边存在一对方向相反的电流密度约为0.4 A/m^2的长电流带,可称其为一对共轭电流带.这对共轭电流带在耀斑发生之前、期间以及之后一直存在;并且观测到,该耀斑的两个亮带的位置几乎刚好与两个电流带重叠,它们的形状也极其相似. 9月6日电流总强度演化曲线表明,电流强度在X9.3级强耀斑爆发期间出现快速增加的现象,这种现象持续了几个小时.这一研究结果有力支持了磁准分界面(Quasi-Separatrix Layer, QSL) 3维重联模型.

Using the vector magnetograms observed by SDO(Solar Dynamics Observatory)/HMI(Helioseismic and Magnetic Imager),the current distribution and evolution of the vertical electric current associated with the X9.3 flare that occurred in the active region AR12673 on Sept.6,2017 are studied in detail.The results show that there is a pair of ribbons of electric current with opposite directions and the magnitude of 0.4 A/m^2,which can be called conjugate electric current ribbons.The electric current ribbons exist before,during,and after the flare;and they are co-spatial and share a similar morphology with flare ribbons very well.The total electric current integrated over the active region increased sharply during the flare,and the increment persisted for several hours after the flare.All results support the model of QSL(Quasi-Separatrix Layer)magnetic reconnection.