Observational data on solar activity is a basement for investigation of processes that take place on the Sun and interplanetary space, with data of long-term observations being of special importance. ... Subsection "Sunspot groups" is the catalogue of all sunspot groups that were observed in the given year. ... For every day of observation of the group the area of the group, the area of the largest spot (both areas - in millionths of solar hemisphere) and number of spots in the group are presented. ...

Multi-Wavelength investigations of the Sun and modern problems of solar activity . SAO RAS . ... Section "Physics of solar plasma" under the Council "Sun – Earth" . ... Bogod V.M., Dr.Sci (SPb Branch of SAO RAS) deputy chairman . ... SAO RAS) - chairman . Bogod V.M. (SPb Branch of SAO RAS) - deputy chairman . Mingaliev M.G. (SAO RAS) - deputy chairman . Kostjuk I.P. (SAO RAS) scientific secretary . ... Vitkovskij V.V. (SAO RAS) . Kaltman T.I. (SPb Branch of SAO RAS) . ... RAS | ...