Delta Sunspots In Solar Cycle 22-23

Guo Juan, guojuan@bao.ac.cn, Key Laboratory of Solar Activity, National Astronomical Observatories, Beijing, China


Abstract
We have studied the features of delta sunspots in solar cycles 22-23. It is found that the distributions of the delta sunspots in the two solar cycles are of great difference: the delta sunspots were concentrative before and near the maximum in the 22nd solar cycle, whereas, scattered in the whole 23rd cycle. The distribution features in the 23rd solar cycle is consistent with our previous work with quantitatively method(Guo J. et al, 2010, MNRAS).