AR4811的精细结构演化特征及有关耀斑活动

Evolution Characteristics of the Fine-Structure of AR4811 and the Associated Flare Activity

用我国第一台高分辨光球——色球望远镜所取得的AR4811的高空间分辨(≤1″)的黑子和Hα色球照相资料分析了该活动区的精细结构的演化特征及有关耀斑活动。指出:(1)和当地原有磁场极性相同的新磁流的浮现在黑子群演化过程中起着阶段性的重要作用,但对活动区耀斑活动贡献不大。(2)有关暗条的各种频繁活动是当地耀斑的一种先兆。(3)活动区中相反极性磁场的相互挤压、剪切和旋转同时存在,是一个2B/M1.3级等一系列耀斑可能的储能机制。而与当地原有磁场极性相反的磁流环的浮现,是2B/M1.3级耀斑的可能触发因素。

The evolution characteristics of the fine-structure of AR4811 and the associated flare activity are analysed in this paper by using the high-space-resolu-tion photographic observations of the sunspot group and Hα chromosphere obtained with the first high-resolution photospheric and chromospheric telescope in. China. It is pointed that ( 1 ) the newly emerging magnetic flux with the same polartties as those of the original magnetic fields plays an important role in the course of the evolution of the spot group but has no greater contributions to the flare activity, ( 2 ) the frequent activity of the related filaments is an indication of flares and ( 3 ) the simultaneous co-existence of the mutual extrusion, shearing and rotation of the magnetic fields with opposite polarities is a possible mechanism of the storage of energy for a scries flares like the 2B/M1.3 one, while the emergence of the magnetic flux loop with the polarities opposite to those of the original magnetic fields is a possible trigger factor of the 2B/M1.3 flare.