Study of the decay rates of the umbral area of sunspot groups by using a high resolution database

摘要: The emergence and decay of the sunspot groups are important components solar dynamo models. There two different types studies on evolution active regions. One them is based fewer data with higher spatial resolution, other one uses more lower resolution. input present study allow investigation high-resolution both spatially temporally. temporal resolution SoHO Debrecen Sunspot Database (SDD) a half hours, it also makes possible to identify all individual sunspots position, area, magnetic polarity. More than 200 have been selected, which clear maxima disc, decrease their umbral area observable during at least four days. rates were calculated by using data: number contained -- these computed for total leading following parts. rate has linear dependency, part one.