Figure 5. Top plot: Dependence of the solar dynamo-number D = R_αR_Ω on a magnitude of the toroidal magnetic field (for detials of the parameters see the text).

Bottom plot: Variations of the toroidal magnetic field simulated for cycles 21–26 with two layer αΩ dynamo model (see Methods section) for the inner (red line) and upper (blue line) layers. One arbitrary unit corresponds to 1–1.5 Gauss (see text for details).