Strong-field spherical dynamos
نویسندگان
چکیده
منابع مشابه
Resonances for activity waves in spherical mean field dynamos
Context. It has been suggested that resonant phenomena may play a role in determining the properties of mean-field dynamos, such as operate in the Sun and other stars. Aims. We tried to identify resonances which are expected to occur when a mean-field dynamo excites waves of quasi-stationary magnetic field in two distinct spherical layers. Methods. We used a model with two physically separated ...
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Several one and two dimensional mean field models are analyzed where the effects of current helicity fluxes and boundaries are included within the framework of the dynamical quenching model. In contrast to the case with periodic boundary conditions, the final saturation energy of the mean field decreases inversely proportional to the magnetic Reynolds number. If a nondimensional scaling factor ...
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RE PR INT The helicity constraint in spherical shell dynamos A. Brandenburg, P. J. Käpylä, D. Mitra, D. Moss, and R. Tavakol 1 NORDITA, Roslagstullsbacken 23, SE-10691 Stockholm, Sweden 2 Observatory, University of Helsinki, PO Box 14, FI-00014 University of Helsinki, Finland 3 School of Mathematical Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS, UK 4 School of Mathem...
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The question is answered whether α 2-shell-dynamos are able to produce a cyclic activity or not. Only kinematic dynamos are considered and only the solutions with the lowest dynamo number are studied without restrictions about the axial symmetry of the solution. The α-effect is allowed to be latitudinally inhomogeneous and/or anisotropic, but it is assumed as radially uniform in the turbulent s...
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ژورنال
عنوان ژورنال: Journal of Fluid Mechanics
سال: 2016
ISSN: 0022-1120,1469-7645
DOI: 10.1017/jfm.2015.747