Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...232..277b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 232, no. 1, June 1990, p. 277-291.
Astronomy and Astrophysics
Astrophysics
84
Magnetic Diffusion, Magnetohydrodynamic Turbulence, Rayleigh-Benard Convection, Solar Magnetic Field, Three Dimensional Models, Compressible Flow, Magnetic Field Configurations, Magnetohydrodynamic Waves
Scientific paper
Results are presented of a simulation of turbulent three-dimensional magnetic convection under the influence of rotation in a fluid layer whose depth is about 1 pressure-scale hight. The approach is similar to that of Meneguzzi and Pouquet (1989), except for the assumptions that the fluid is a compressible conducting gas and there is a vanishing horizontal magnetic field at the boundaries. The results demonstrate that topological effects may be of great importance for MHD convection. It is shown that, as a consequence of topological effects, anisotropies of the alpha-effect can play a dominant role. In particular, the sign of alpha(V) can be opposite to that expected from a first-order smoothing approach.
Brandenburg Axel
Nordlund Aake
Pulkkinen Pentti
Stein Robert F.
Tuominen Ilkka
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