太阳物理研究组知识库

The X-ray flare events of class larger than M ocurring between April, 1, 1987 and December 30, 1992 and listed in SGD (Solar Geophysical Data) have been statiscally analysed. During this period of maximum activity of the 22nd solar cycle, the annual number of flare events is larger in the southern hemisphere than in the northern hemisphere. The N-S asymmetry with the dominance of the southern hemisphere, already studied for the number of spots, really exist for the flare events. The solar cycle 22 seems to have the same behaviour than the cycle 21 in respect to the N-S asymmetry.