Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...281...46r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 281, no. 1, p. 46-50
Astronomy and Astrophysics
Astrophysics
31
Dynamo Theory, Stellar Magnetic Fields, Stellar Rotation, Stellar Structure, Symmetry, Turbulence Models, Density Distribution, Diffusion Theory, Isotropic Media, Late Stars, Magnetohydrodynamic Turbulence
Scientific paper
A new philosophy is presented for the excitation of non-axisymmetric magnetic fields in spherical dynamo models. For the first time the dynamo operation is considered with an alpha-tensor whose components altogether result from one and the same turbulence model in a density-stratified plasma. The related alpha-tensor is highly anisotropic, its azimuthal component dominates all the other components. As a consequence, in all models without differential rotation the preferred magnetic modes are non-axisymmetric - independently of their rotation rate. The often discussed traditional alpha2-dynamo with axisymmetric large-scale field geometry seems not to exist. Differential rotation, however, works in favor of the axisymmetric modes. For slow and rapid basic rotation the critical value of the differential rotation, for which the transition to axisymmetry occurs, is determined. It proves to be so large that the question appears why the Sun's magnetic field is basically axisymmetric.
Elstner Detlef
Ruediger Guenther
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