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Nonlinear Nonaxisymmetric Dynamos for Active Stars

Published online by Cambridge University Press:  12 April 2016

David Moss
David Moss*
Affiliation:
Mathematics Department, The University, Manchester M13 9PL, United Kingdom

Abstract

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Recent observations seem to have detected large scale nonaxisymmetric structures on active giant stars. These structures are plausibly associated with underlying, dynamo generated, nonaxisymmetric magnetic fields. Such developments have motivated the development of a computer code to solve the nonlinear mean field dynamo equation in spherical geometry with no imposed geometrical symmetries. The nonlinearity is a simple α-quenching. The nature of the stable solutions found depends quite sensitively on the assumed spatial distribution of both α-eflect and differential rotation, and also on the degree of supercriticality of the dynamo. Such a dynamo model with stable, purely nonaxisymmetric solutions is described in this paper.

Type
Part II Current stellar dynamo theory
Information
International Astronomical Union Colloquium , Volume 130: The Sun and Cool Stars: activity, magnetism, dynamos , 1991 , pp. 112 - 116
Copyright
Copyright © Springer-Verlag 1991

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