Physics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..128..243b&link_type=abstract
(IAU, The Inside the Sun Colloquium, 121st, Versailles, France, May 22-26, 1989) Solar Physics (ISSN 0038-0938), vol. 128, July
Physics
35
Dynamo Theory, Helioseismology, Solar Magnetic Field, Solar Rotation, Magnetic Field Configurations, Nonlinear Equations, Planetary Waves, Spherical Shells
Scientific paper
Dynamically consistent mean-field dynamos are considered in a spherical shell of incompressible fluid. The generation of magnetic field and differential rotation is parameterized by the alpha- and Lambda-effects, respectively. Extending previous investigations, the cases of moderate and rapid rotation are now included in the sense that the inverse Rossby number can approach or exceed unity. This can lead to disk-shaped Omega-contours, which are in better accordance with recent results of helioseismology than cylindrical Omega-contours. On the other hand, in order to obtain alpha-omega-dynamo cycles, the Taylor number has to be so large, that eventually cylindrical Omega-contours become unavoidable. The discussion covers the different possibilities in a state diagram, where the inverse Rossby number and the relative correlation length are taken as the elementary parameters for mean-field dynamos.
Brandenburg Axel
Moss Derek
Ruediger Guenther
Tuominen Ilkka
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