光学天文与技术应用研究室知识库

对3个超级活动区(大的δ型黑子群)NOAA5395、6659、6891中的电流分布作了系统计算;利用己发表的计算方法,首次用于实际活动区的水平电流分布;给出了电流与耀斑核的关系.将这种关系分为两类:密切相关和准相关,并同时给出了统计结果.结果显示:1)对于垂直电流和水平电流来说,密切相关率分别是29％和10％,准相关率分别是50％和30％;2)有些耀斑核与两种电流都相关,而大多数只与其中一种相关;3)与两种电流都不相关的耀斑核只占6％左右;4)两种电流起互补作用,因而对于预报耀斑具有一定的作用.通过分析还发现,磁场剪切强的地方相应于强的垂直电流,而磁中性线附近纵向磁场梯度大的地方相应于强的水平电流.

We present the results of intraday variability observations in compact extragalactic radio sources with the 25m radio telescope of Urumqi Astronomical Observatory at 5GHz. In total we have observed 116 flat-spectrum sources, of these, 17 show IDV. We present here a summary table of the results, as well as the light curves and structure functions of a few sources. Either interstellar scintillation or an intrinsic origin could be the cause of the variability in these IDV sources. Further observations over a longer time scale are needed to explain the IDV.