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The solar dynamo with meridional circulation

Choudhuri, AR and Schussler, M and Dikpati, M (1995) The solar dynamo with meridional circulation. In: Astronomy & Astrophysics, 303 (2). L29-L32.

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We show that meridional circulation can have a profound influence on dynamo models for the solar cycle. Motivated by the observed tilt angles of sunspot groups we assume that the generation of the poloidal field takes place near the surface, while a shear layer of radial differential rotation produces the toroidal field at the bottom of the convection zone. Both layers are coupled by a circulation with a poleward directed flow in the upper part and an equatorward flow in the deep layers of the convection zone. The circulation forces the toroidal field belts (which are responsible for the surface activity) to move equatorward. This leads to butterfly diagrams in qualitative agreement with the observations, even if the dynamo wave would propagate poleward in the absence of circulation. This result opens the possibility to construct models for the solar cycle which are based on observational data (tilt angles, differential rotation, and meridional circulation).

Item Type: Editorials/Short Communications
Publication: Astronomy & Astrophysics
Publisher: EDP Sciences
Additional Information: Copyright of this article belongs to EDP Sciences.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 27 May 2011 05:55
Last Modified: 27 May 2011 05:55
URI: http://eprints.iisc.ac.in/id/eprint/37975

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