Remarks on some typical assumptions in dynamo theory

Details Remarks on some typical assumptions in dynamo theory Remarks on some typical assumptions in dynamo theory

2010-12-07

arxiv.org/abs/1012.1506v1

Physics

Fluid Dynamics

Published in Geophys. Astrophys. Fluid Dyn

Scientific paper

10.1080/03091929.2010.519891

Some concepts used in the theory of convection-driven dynamos in rotating spherical fluid shells are discussed. The analogy between imposed magnetic fields and those generated by dynamo action is evaluated and the role of the Elsasser number is considered. Eddy diffusivities are essential ingredients in numerical dynamo simulations, but their effects could be misleading. New aspects of the simultaneous existence of different dynamo states are described.

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