Features of the solar-type activity of stars with various depths of the convective zone

The levels of chromospheric and coronal activity of the Sun are compared with new vast observations of late-type stars. The solar chromosphere turned to be more powerful than in the main body of stars and the corona is considerably weakened. A wavelet analysis of activity indices and measurement results for the magnetic field of the Sun as a star was performed for several solar cycles. It was obtained that solar activity in the differential rotation differs from phenomena on less massive K stars with cycles and, in contrast to them, the large-scale magnetic field of the Sun is a regulating factor for active processes. These results can be naturally explained with the assumption that the activity of a star with a given mass depends on the depth of the lower base of the convective zone. This seems to require the development of knowledge about the two-level dynamo and a new approach to studying solar-type activity.