Solar torsional oscillations and the grand activity cycle

Details Solar torsional oscillations and the grand activity cycle Solar torsional oscillations and the grand activity cycle

Nov 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999soph..189..227k&link_type=abstract

Solar Physics, v. 189, Issue 2, p. 227-239 (1999).

Physics

31

Scientific paper

Some consequences of a nonlinear coupling between magnetic field and rotation are studied within a solar type 2D dynamo model for a spherical convective shell. The magnetic feedback on the rotation law produces two main effects. First, the torsional oscillations are excited. Second, a long-term amplitude modulation of the dynamo cycles is produced. The latter may be identified with the grand cycle of solar activity. The dynamo model seems to be in accord with the phase relations between the torsional and magnetic activity oscillations observed in the 11-year cycle as well as in the 55-year grand cycle. It, however, fails to reproduce the observationally suggested global decreasing trend in the equatorial rotation rate.

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