From top to bottom: zoom-ins of the time-latitude diagram of the mean toroidal magnetic field near the surface (at R_s) and bottom (at R_b), the angular velocity variations, and the Reynolds stress components R_rφ and R_θφ near the surface (at R_s) during t = 20−65 yrs, showing that the magnetic cycle and surface activity are strongly disturbed (t = 20−45 yrs), after which the regular state is quickly recovered (t = 45−65 yrs).