【摘要】 我们利用紫台1981年5月16日获得的发生在MW.No.22278复合群(N12°、E14°)的一个双带质子大耀斑的高分辨黑子白光和H_α色球资料,讨论了这个大耀斑发生前8小时和大耀斑初相时光球和色球的变化,分析了浮现磁流、冲浪、暗条爆发与耀斑开始的关系,发现中性线旁异极性磁流的生长产生的冲浪造成了中性线处暗条的扰动和爆发,并导致了大耀斑。从而验证并扩充了浮现磁流的耀斑模型。更多还原

【Abstract】 On the basis of a series of high-resolution white light heliograms and of Ha filterg-rams observed simultaneously at Purple Mountain Observatory, the changes in the photosphere and the chromosphere for a great two-ribbon proton flare of May 16, 1981 which occurred in a complex sunspot group with Mt. wilson number 22278(N 12°, E 14°), are analysed in detail. A comparison of the preflare with the initial-flare is made. The correlative analyses are made for the onset of the flare with the emerging flux, the surge, and the eruption of filament. The observations show the followings:(A) A characteristic of the sunspots is the emergence and the growth of the tiny pores, the dividing and the breakup of the penumbra of the great spots in the period of the preflare about 8 hours preceeding the onset of the flare. However, some obvious changes of Ha chromospheric feature were not observed in the corresponding region.(B) Before the flare, the motions of the sunspots and the morphology of the chromospheric fibre may show the opposite shearing motion along the neutral line on each side of the filament. After the flare, the gradual twisting process of the loop system between the two ribbons seems to be also associated with the shearing motion.(C) From the white-light photographs compared with the magnetograms it may be shown that the emergence of the spot pore in the location " J" was correlated with the emergent field of an opposite polarity near the neutral line on May 16, 1981. The peturbation and the eruption of the filament along the neutral line could be caused by the triggering of the surge in the location "J", which was referred to the increase of the emerging opposite polar magnetic flux, and led to the flare.(D) The perturbation and the eruption of filament occurred simultaneously with the plage brightenings near the neutral line. In the process the filament could undergo the breakup, darkening, broadening and upward exploding motions.(E) The velocity field of the surge may disturb the magnetic field above the neutral line and lead to the eruption of the filament. For different flares the height of the site of the reconnection region in the filament over the neutral line may be different. Hence sometimes the filament remains, sometimes a part of the filament remains and sometimes the filament disappears completely.From these observations we may confirm and expand the emerging flux model for the solar flare phenomenon.更多还原