DELTA-SUNSPOTS AND X CLASS FLARES IN SOLAR CYCLE 22
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摘要: 用22太阳活动周的221个δ黑子群(从1986年至1991年),研究δ黑子群的特性,δ黑子群与X级X射线耀斑(XXF)之间的关系。1.证实了Tang,Zirin和Liggett的发现:所有δ黑子群源于二个偶极黑子区。由其中之一的前导黑子与另一群的后随黑子相互渗透而构成;在δ黑子的极性分界线上,磁场是强烈地剪切的。同时还找到了许多δ黑子解体的事例。这点与Zirin(198)的结论相悖。δ黑子的解体是由于黑子自行所造成的。2.δ黑子的相反极性的磁通量,存在着不平衡:对曾产生过104个XXP的35个δ黑子群,磁通量多的一极与少的一极磁通量之比平均为5.3.对所有耀斑高产的活动区,诸如AR5395,5629,6555,6659及6891,它的磁通量比值均大于等于5.3.δ黑子群的寿命,与XXF的产率之间,存在很好的相关关系.Abstract: Asample of 221 active region with magnetic configurations from 1986 to 1991 in solar cycle 22 is used to investigate the characteristics of δ-sunspots and the relationship between the δ-sunspots and Xclass X-ray flares.(1) The previous findings from Tang (1983), Zirin and Liggett (1987) are confirmed that all δ-sunspots form from penetration of leading and following sunspots from two dipolar regions, and have strong sheared transverse field on the polarity inversion line. However, unlike that concluded by Zirin (1987), examples of separation of δ-sunspots have been identified in this study. The separation is caused by individual proper motions of each dipole.(2) The δ-sunspots tend to have an imbalanced flux in opposite polarities. For 35 δ-sunspots with available sunspot data and Huairou magnetograms at hand, which produce 104 Xclase X-ray flares, the average ratio of flux in majority polarity to minority polarity is about 5.3; and in all highly flare productive regions, such as AR5395, 5629, 6555, 6659 and 6891, the a ratio is≥5.(3) There are relationship intimately between lifetime of δ-sunspots and productivety of Xclass X-ray flares.
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Key words:
- Magnetic fields of Solar Active Region /
- δ-sunspots /
- Flares
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