  The activity of the Sun as a result of cyclic changes of the global magnetic
field is studied. As a consequence of the analysis of magnetic activity of
solar-type stars the following power dependencies were found: the dependence
between the rotation periods and the effective temperatures, the dependence
between the duration of the "11-year" cycles of activity and the effective
temperatures, and the dependence between the duration of quasi-biennial cycles
and the effective temperatures. It is shown that the physical nature of these
dependencies associated with the observed properties of solar-type stars and
can be explained by the existence of internal Rossby waves around the base of
convective shells of these stars.
