高能耀斑的热点及其与大尺度磁场的演化关系

THE HOT SPOTS OF ENERGETIC FLARES AND THEIR EVOLUTIONAL RELATION TO THE LARGE SCALE MAGNETIC FIELDS

本文采用一个表征高能耀斑强度的综合指数,分析了21周以来(1976年7月—1991年2月)级别≥M1.0的X射线耀斑和能量≥10 MeV的质子耀斑综合指数的时空分布,提出在研究时段内太阳上的13个高能耀斑"热点".这些热点活动区反复回转,爆发了占总指数58.1%的高能耀斑.本文还进一步讨论了高能耀斑热点的特征及其与大尺度磁场的演化关系.结果表明,高能耀斑热点与大尺度磁场的演化关系密切,前者受后者的调制.

A comprehensive energetic flare index which can be characteristic of the X-ray and proton radiation intensity of flares is proposed: I=Im+Ix+Ip=1/10ΣCm+ΣCx+Σ(logP)~2 The time and spatial distributions of the 'energetic flare indices', which have been observed since Cycle of 21, are analysed and 13 'hot spots' of energetic flares during this period are given in this article. These active zones of the 'hot spots' appear repeatedly where erupted the energetic flares accounting for 58.1 precent of the total indices. The characteristics of the hot spots of energetic flares and the relationship between the hot spots and the evolution of the large scale magnetic fields are also further discussed. It is shown that the evolution of the hot spots of flares has close relation to the evolution of the large scale magnetic fields, with the former being modulated by the latter. The duration of the 13 hot spots given here is not beyond the limit of the time interval of their existence, divied in this paper. On the whole and generlly, the hot spots can last for 2 or 3 years or slightly longer.