Is the Butterfly diagram due to meridional motions?

Details Is the Butterfly diagram due to meridional motions? Is the Butterfly diagram due to meridional motions?

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002an....323..432r&link_type=abstract

Astronomische Nachrichten, vol. 323, no. 3/4, p. 432-435

Astronomy and Astrophysics

Astronomy

7

Solar Dynamo, Alf-Effect, Rotation Law

Scientific paper

The dynamo equation is solved for the solar convection zone with the given (``observed'') rotation law and positive \alf-effect. If the latter exists in the entire convection zone the resulting dynamo shows strong toroidal field belts in the polar region migrating equatorwards. The same happens for alpha concentrated at the bottom of the convection zone but then we get too many belts with higher amplitude. The cycle period is always too short. Including meridional circulation which is directed equatorwards at the bottom of the convection zone (where the eddy diffusivity is reduced), the amplitude of the toroidal field grows and the butterfly diagram reaches low-latitudes. The cycle time approaches the solar value. The dynamo regime is highly sensitive to the interplay between flow and diffusivity at the bottom of the convection zone. Stationary solutions are not very seldom.

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