Space Climate 7 Meeting Abstract
Evolution of sunspot groups studied on a large statistical sample
Judit Muraközy (HAS RCAES Konkoly Obs., DHO)
The Solar Heliospheric Observatory/Michelson Doppler Imager - Debrecen Data (SDD) sunspot catalog provides an opportunity to study the sunspot group on a large statistical sample with high temporal resolution. Its temporal resolution is about 1.5 hours and contains location, area and magnetic polarity data for all sunspots. It makes possible detailed study of the behavior not only for the whole sunspot groups but its leading and following parts as well. The results of the detailed investigation of the developing phase will be presented, the leading part moves forward; this is more noticeable in larger active regions. The leading part has a higher growth rate than the trailing part in most cases in the developing phase. The growth rates of the sunspot groups depend linearly on their maximum total umbral area. One can find an asymmetry in compactness ie. the number of spots is smaller while their mean area is larger in the leading part at the maximum phase. The sunspot decay and its rate as well as its possible cycle dependence will also be shown.
Mode of presentation: oral (Need to be confirmed by the SOC)