Remarks on some typical assumptions in dynamo theory

Remarks on some typical assumptions in dynamo theory

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 ingredient...

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Veröffentlicht in:arXiv.org 2010-12
Hauptverfasser: Simitev, R D, Busse, F H
Format: Artikel
Sprache:eng
Schlagworte:
Computer simulation
Convection
Dynamo theory
Physics - Fluid Dynamics
Rotating fluids
Rotating generators
Rotating spheres
Spherical shells
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Beschreibung
Zusammenfassung: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.
ISSN:2331-8422
DOI:10.48550/arxiv.1012.1506