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

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.