摘要
本文对第22周以来产生M级以上(包括M级)的X射线耀斑的太阳黑子活动区进行了统计分析,得到如下结果:(1)黑子活动区在南北半球上分布是不均匀的。具体表现是:南半球出现的黑子活动区多于北半球出现的。南半球活动较强的黑子群主要集中在80°,160°,200°和340°经度附近;北半球活动较强的黑子群主要集中在240°-280°和340°-360°经度带。(2)黑子群的面积(S_p)越大越易产生X级的X射线耀斑。对黑子群面积S_p在大于1000,500-1000和小于500单位时,它们产生X级的X射线耀斑的比率分别约为41％,33％和9％。
In the paper, we have statistically analysed the data of sunspot groups of x-ray flares with class≥M during the period Sep. 1986-Oct. 1990 of the 22nd cycle. We have obtained the following conclusions: (1) The distributions of sunspot active regions in the southern and northern hemispheres are asymmetric. The numbers of sunspot active regions of the southern hemisphere is more than that of the northern hemisphere; The sunspot groups of stronger activity cluster in certain zones of heliographic longitude, ie. 80°-160°, 200°, 340° for the scuthern hemisphere and 240°-280°, 340°-360° for the northern hemisphere. (2) The occuring rate for X-ray flare (class X) is about 41%, 33% and 9% for the area of sunspot group>1000, 500-1000 and <500 respectively.
