INVESTIGATION OF THE SOLAR ROTATION USING GROUP OF SUNSPOTS IN 1985 - 1999

摘要

Based on measurements of sunspots groups at King Abdul-Aziz Solar Observatory (KAAUSO) 1985-1999, we determined the solar differential rotation during solar activity cycle No. 22 and part of 23. We found that the rotation rate for the sunspots groups is W =14.02 ― 2.87 sin 2 f (deg/day), which is less than the rate of the individual sunspots that reduced from the same measurements by about 0.7 %.