We note that the presence of two distinct dynamical regimes
with different temporal (spectral) properties supports the hypothesis
suggested by Benevolenskaya (1998, 2000) of a double
cycle characterized by different timescales. Benevolenskaya
(1998, 2000) suggested a double (dynamo) mechanism for the
solar magnetic cycle, the first generated at the base of the convection
zone by large-scale radial shear of the angular velocity
and responsible for the 22-yr Hale’s cycle and, thus, for the
usual 11-yr activity cycle (Ruzmaikin 1996); the second due to
latitudinal or radial shears in the subsurface regions. Although
evidence of these two double mechanisms has been found, the
11-yr modulation in the spectrum of the second regime suggests
that at the origin of the observed complexity there is a nonlinear
coupling between the mechanisms.