Properties of mean field dynamos with non-axisymmetric alpha-effect

Details Properties of mean field dynamos with non-axisymmetric alpha-effect Properties of mean field dynamos with non-axisymmetric alpha-effect

Jul 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...247..576m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 247, no. 2, July 1991, p. 576-579.

Astronomy and Astrophysics

Astrophysics

18

Dynamo Theory, Galaxies, Magnetic Fields, Magnetohydrodynamic Turbulence, Linear Equations, Nonlinear Equations

Scientific paper

The influence of an azimuthally dependent alpha-effect on the properties of alpha(2) and alpha(2)Omega-dynamos in spherical geometry is investigated. Consideration is given solely to odd parity solutions in linear theory. For all the present linear models an exponentially growing mode, consisting of locked axisymmetric and nonaxisymmetric parts is found. A strong nonaxisymmetry in alpha substantially increases the linear growth rates at given dynamo number and can result in a marginal dynamo number. Some exploratory nonlinear calculations are also reported and the relevance of the present results to galactic dyanmos and to stars is briefly discussed.

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