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Symmetry Breaking in the Solar Dynamo: Nonlinear Solutions

Published online by Cambridge University Press:  08 February 2017

R.L. Jennings
Affiliation:
Department of Mathematics and Statistics The University Newcastle upon Tyne NE1 7RU UK
N.O. Weiss
Affiliation:
Department of Applied Mathematics and Theoretical Physics University of Cambridge Cambridge CBS 9EW UK

Abstract

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We examine an idealized αω-dynamo model in which the magnetic fields depend only on latitude and time. The solutions that bifurcate from the field-free state are either symmetric or antisymmetric about the equator (quadrupolar or dipolar respectively). Nonlinear steady and periodic solutions, whether stable or unstable, can be followed numerically as the dynamo number is varied, revealing a rich bifurcation structure with mixed-mode solutions (lacking symmetry about the equator) appearing at secondary bifurcations. These results show how stable asymmetric fields can occur in the sun and illustrate the formation of complicated spatial structure in more active stars.

Type
VI. Generation of Solar Magnetic Fields
Copyright
Copyright © Kluwer 1990 

References

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