【摘要】 本文对1980年10月15日产生在小黑子区的3级大耀斑作了详细的形态分析,,结果表明:1)耀斑无闪相,耀斑的最大强度为周围来扰区的2.4倍。2)耀斑有M带结构,双带的分离速度为5公里/秒。3)和耀斑有关的暗条位于大尺度磁场的极性分界线上,它在耀斑前和耀斑期间有明显变化,最终全部消失。4)耀斑的微波爆发增量小,上升下降缓慢,米波段有Ⅱ、Ⅲ、Ⅳ型爆发。5)耀斑的x射线辐射引起电离层2级骚扰(SLD)。耀斑无地磁暴对应。6)产生耀斑的活动区在日面存在3周,耀斑产生在活动区的衰亡阶段。以上结果基本与文献相同。 在本文的最后一节,对无黑子或小黑子区的耀斑形成作了简短的讨论,指出由日珥物质下落形成大耀斑所遇到的能量亏缺;日珥物质下落形成的激波,由于磁场的存在而强度削弱,磁场不能通过激波转化为辐射能;无黑子(或小黑子)区的耀斑的形成,在机理上可能与黑子区形成的耀斑类同。更多还原

【Abstract】 A .3B flare which occurred in a spotless region on Oct. 15, 1980 is rrio-phologically analysed in some detail. The main results of the analysis are as follows: 1) The flare had no flash phase and the maximum intensity of the flare was about 2.4 times as much as that of the undisturbed region. 2) The flare had the double-ribbon structure with the separation velocity of about 5 km/sec. 3) The filament in connection with the flare was located at the boundary of a large scale magnetic field with opposite polarities. The filament obviously changed just before and after the flare, and finally disappeared. 4 ) The increment of the corresponding microwave burst was very small and the rise and fall of the burst were very slow. There were the meter-wave bursts of type-Ⅱ , type-Ⅲ and type-Ⅳ to go with the flare. 5) During the flare the x-ray emission of the flare caused a SID of Important 2 but there was no corresponding geomagnetic storm. 6) The flare region exsisted for three solar rotations and the flare occurred in the declining phase of the active region. Basically, all of the results mentioned above are very similar to Dodson’s results.There is a brief discussion on the formation of flares which occurred in spotless regions. It is pointed out that the explanation of the splash-down of prominence material encounters difficulties in energy deficit; the intensity of the shock formed by the splash-down of, prominence material will be weakened by the exsisting magnetic field and the magnetic field can not be transformed into radiation energy with the aid of shocks; the mechanism of the formation of flares which occurred in spotless regions may be similar to that of flares which occurred in ordinary spot active regions.更多还原