Cycles of magnetic activity in solar-type stars. The place of the Sun among the stars with different levels of coronal and chromospheric activity

E. A. Bruevich, V. V. Bruevich, E. V. Shimanovskaya

Published 2015-08-02Version 1

Activity of the chromospheres and coronas of the stars of late (F, G, K) spectral classes and also their cyclic activity is analyzed on the observational data of solar-type stars from Mount Wilson "HK-project". The chromospheric and coronal activity of "HK-project stars" and the Sun was compared to the stars with active atmospheres observed in Planets Search Programs. It is shown that the cyclic activity begins to occur in stars, close by their spectral type to the Sun and becomes more pronounced at K-stars. The results of a comparative analysis of the characteristics of chromospheric and coronal activity of the Sun and F, G and K-stars are presented.