Convective dynamos in spherical wedge geometry

Intermittency in spherical Couette dynamos

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The helicity constraint in spherical shell dynamos

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...

Do spherical α 2 - dynamos oscillate ?

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...

“Unusual Properties of Convection and Dynamos in Rotating Spherical Shells”

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 ...