1999/11/10 by K. -H. Raedler, U. Geppert
Physics and Astronomy · #astro-ph
published as ASP Conference Series, Vol. 178, 199, p. 151 · 13 pages, 3 figures
arxiv created 1999/11/10 · arxiv updated 2009/12/01
The paper deals with a simple spherical mean-field dynamo model of α2-type in the case of high electrical conductivity. A spherically symmetric distribution of turbulent motions is assumed inside a spherical fluid body surrounded by free space, and some complete form of the corresponding mean electromotive force is taken into account. For a turbulence lacking reflectional symmetry finite growth rates of magnetic fields prove to be possible even in the limit of perfect conductivity, that is, the model corresponds to a fast dynamo. In accordance with the theorem by Bondi and Gold the dynamo-generated field is completely confined in the fluid body.