Dynamo action of a mean flow caused by latitude-dependent heat transport

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Dynamo Theory, Magnetohydrodynamic Flow, Solar Cycles, Turbulent Heat Transfer, Kinematics, Meridional Flow, Reynolds Number, Solar Rotation, Toroids

Scientific paper

On the basis of the mean field induction equation axisymmetric, kinematic alpha omega-dynamos are calculated and applied to the sun. With turbulent kinematic viscosity and magnetic diffusivity both of the order of 10-100 million sq m/s and a turbulent heat diffusivity of the order of one trillion sq m/s, meridional velocity at the surface and the pole-equator temperature difference are found to be smaller than 1 m/s and 3 deg K, respectively. In addition, the critical Reynolds number of the alpha-effect is such that the strength ratio of the mean poloidal field to the toroidal one is about 0.01.

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