Typical time-latitude and time-radius (at the 30° latitude) diagrams of the toroidal field (gray scale), the radial field (contours at left panel) and the poloidal magnetic field (which is drawn by the contours of the vector-potential at the right panel) evolution in the 2D1α model (see Table 1). The toroidal field averaged over the subsurface layers in the range of 0.9−0.99   R_⊙, the radial field is taken at the top of the convection zone.