Stellar Dynamo Waves: Asymptotic Configurations

Details Stellar Dynamo Waves: Asymptotic Configurations Stellar Dynamo Waves: Asymptotic Configurations

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004gapfd..98..257m&link_type=abstract

Geophysical and Astrophysical Fluid Dynamics, vol. 98, Issue 3, p.257-272

Physics

Fluid Dynamics

8

Scientific paper

We investigate the parameter space of a Parker dynamo with a simple alpha quenching nonlinearity, taking as governing parameters the dynamo number D (D<0) and the ratio of diffusion times in the radial and latitudinal directions in the convective zone. The latter parameter, μ, is connected with the aspect ratio (dimensionless thickness) of the convective zone. We isolate two asymptotic configuration of the dynamo waves excited by the Parker dynamo in the limiting case of strong generation. Apart from the standard case with the solar type dynamo wave travelling from mid-latitudes to the equator, we describe a form of dynamo activity which is basically an anharmonic standing wave. The first situation occurs when μ increases with |D|. With μ fixed and |D| increasing, the second asymptotic configuration occurs. We discuss possibilities of identifying these asymptotic configurations with various types of stellar activity as traced by stellar CaII data.

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