太阳γ-ray耀斑的统计特征  

THE STATISTICS CHARACTERISTICS OF GAMMA-RAY FLARES

作　　者：许敖敖[1] 印春霖[2] 张和祺 吴式灿[3] 

机构地区：[1]南京大学天文系 [2]中国科学院紫金山天文台 [3]美国阿拉巴马大学

出　　处：《天文学报》1991年第1期36-45,共10页Acta Astronomica Sinica

基　　金：87-64-01-301的中国科学院重点项目基金

摘　　要：本文研究了由SMM卫星上γ-ray Spectrometer(GRS)在1980年3月—1983年6月的三年多时间中所观测的120个太阳γ-ray事件,着重分析产生γ-ray耀斑的活动区的基本特征,并结合Ⅱ型、Ⅳ型米波射电爆的观测结果,进一步讨论了太阳耀斑过程的物理机制,所得结果表明: 1) γ-ray耀斑一般发生在形态结构和磁性质比较复杂的活动区中; 2) 具有γ-ray谱线(即核线)的耀斑与Ⅱ型、Ⅳ型米波爆关系密切; 3) 存在一批多次爆发γ-ray耀斑的活动区,它们的形态和结构特别复杂,磁性质无一例外均为δ型,并具有其它有趣特征.它们的典型性质为我们建立合理的耀斑模型提供了鲜明的观测基础; 4) 在耀斑的基本物理过程中,深入研究活动区电流以及与电流有关的等离子体不稳定性具有重要意义; 5) 不同的耀斑可能有不同的粒子加速机制在起作用.In this paper about 120 solar γ-ray bursts obtained from the SMM satellite during March 1980-June 1983 are studied. It is specially shown that what are the characteristics of active region producing γ-ray flare. On the basis of comparing γ-ray bursts with observational results of type Ⅱ and type Ⅳ radio bursts, the further discussions on the physical mechanism of solar flare are made. The analysis in the paper leads to the following conclusion: ① γ-ray flares generally occur in the active regions with complicated morphology and magnetic structure. ② Flares associated with y-ray emission lines are closely related to type Ⅱ and type Ⅳ meter wave radio bursts. ③ There are several active regions with rich productivity of γ-ray events, the morphology of which are specially complicated and all the magnetic structures belong to δ-type unex-cepdonally. Undoubtedly the typical statistical properties discussed here will provide us some good observational basis to establish a reasonable solar flare model. ④ In the fundamental physical process of solar flare, It is very important to research the current in active region and plasma instability related with it. ⑤ The charged particles acceleration in different solar flares may be different.

关 键 词：太阳 Γ射线爆 耀斑 

分 类 号：P182.52[天文地球—天文学]