Towards a model for the solar dynamo

Details Towards a model for the solar dynamo Towards a model for the solar dynamo

Jul 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.315..521m&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 315, Issue 3, pp. 521-533.

Astronomy and Astrophysics

Astronomy

57

Magnetic Fields, Mhd, Sun: Activity, Sun: Magnetic Fields

Scientific paper

We study a mean field model of the solar dynamo, in which the non-linearity is the action of the azimuthal component of the Lorentz force of the dynamo-generated magnetic field on the angular velocity. The underlying zero-order angular velocity is consistent with recent determinations of the solar rotation law, and the form of the alpha effect is chosen so as to give a plausible butterfly diagram. For small Prandtl numbers we find regular, intermittent and apparently chaotic behaviour, depending on the size of the alpha coefficient. For certain parameters, the intermittency displays some of the characteristics believed to be associated with the Maunder minimum. We thus believe that we are capturing some features of the solar dynamo.

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