Physics – Atomic Physics
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...292..125k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 292, no. 1, p. 125-132
Physics
Atomic Physics
39
Anisotropy, Dynamo Theory, Magnetic Fields, Magnetohydrodynamics, Nonlinearity, Quenching (Atomic Physics), Stars, Stellar Physics, Turbulence Effects, Computational Astrophysics, Kernel Functions, Lorentz Transformations, Reynolds Stress, Stellar Models, Stress Tensors
Scientific paper
A novel scenario for the nonlinear stellar dynamo is presented. Differential rotation in solar-type stars is assumed as due to the influence of the global rotation upon anisotropic turbulence ('the Lambda-effect'). The effect, however, is quenched by the dynamo-induced large-scale magnetic fields. The resulting reduction of the differential rotation feeds back on the dynamo itself. Both the derivation of the Lambda-quenching expressions as well as a (simplified) dynamo model are presented. The dynamo equation is completed with the equation for the radial differential rotation. The phase relation between both the components of the magnetic field and the slope in the rotation law is essential for the temporal behavior of the dynamo magnetism. Both the observational phenomena of solar torsional oscillations as well as the Maunder minimum are covered by the theory.
Kitchatinov Leonid L.
Kueker Manfred
Ruediger Guenther
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