A SUMMARY OF THE ACTIVITIES ON THE SUN AROUND 260° LONGITUDES AND THEIR RADIO CHARACTERISTICS IN THE YEAR OF 1991
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摘要: 本文介绍了太阳L260°活动概况,并计算了黑子群的位置漂移及对应的射电缓变源.北京天文台2.84GHz射电望远镜在该活动区观测到8次特大的射电爆发(流量超过1000s.f.u.),其中4次(1991年5月16日,6月9日,6月11日,8月25日)射电爆发时变曲线十分相似而且这些微波爆发都与Ⅱ型Ⅲ型Ⅳ型米波爆发有良好的对应.可能说明该活动区所对应的日冕在长时间内存在一种磁场位形结构,这种磁场位形结构容易产生日冕物质抛射.Abstract: In the paper, a summary of activities on the Sun around 260° longitudes is presented and the drifts of sunspot groups and parameters of their corresponding slowly varying sources are calculated. Eight great radio bursts were observed with the 2.84GHz radio telescope at Beijing Observatory, among them, four events (1991-05-16,1991-06-09, 1991-06-11, 1991-08-25)are very similar in temporal variations. All of these bursts are well correlated with type Ⅱ, type Ⅲ, type Ⅳ radio meter band bursts.It indicates that in these active regions there are certain magnetic configurations which might be easy to produce mass coronal mass ejection.
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Key words:
- Solar active region /
- Solar flare /
- Radio burst
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