近三个太阳活动周大黑子群的日面经度分布

Longitude Distributions of the Large Sunspot Groups on the Solar Disk in the Past Three Cycles

本文对19、20、21太阳活动周的E、F型别黑子群进行了统计分析,得到:1.大黑子群日面经度随时间(用太阳自转周表示)的分布呈现“V”和“∧”形状;2.三个活动周大黑子群数按经度分布都有两个峰值。

The sunspot groups of Types E and F which appeared in the 19th, 20th and 21st cycles are statisticlly analysed in this paper, with the results showing that (1) the distributions of the solar longitudes of the large sunspot groups with time (expressed by the solar rotation period) are 'V' and 'A' in shape and (2) there are two peaks in the numbers of the large sunspot groups for cach of the three cycles according to the longitude distribution.