Reconstruction of Centennial Series of Solar Activity

Geomagnetism and Aeronomy - The results of the digitalization of the centennial series of solar activity are considered. The data contain information on sunspots since 1918, sunspot umbra since...     

Refinement of the Gnevyshev-Waldmeier Rule Based on a 140-Year Series of Observations

Astronomy Letters - The Gnevyshev—Waldmeier rule relating the lifetimes of sunspot groups and their areas has been verified on an interval of ≈140 years, which exceeds the one used by...     

Comparative Analysis of the Catalog of Individual Sunspots Based on Data from Kislovodsk Mountain Astronomical Station

Geomagnetism and Aeronomy - A comparative analysis of sunspot sizes in sunspot groups was performed. For this analysis, we used the database of characteristics of individual sunspots and pores...