Small Scale Kinematic Dynamos: Beyond the α-Effect

Details Small Scale Kinematic Dynamos: Beyond the α-Effect Small Scale Kinematic Dynamos: Beyond the α-Effect

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004gapfd..98..225t&link_type=abstract

Geophysical and Astrophysical Fluid Dynamics, vol. 98, Issue 3, p.225-234

Physics

Fluid Dynamics

10

Scientific paper

In geodynamo simulations which simulate the generation of an axial dipolar magnetic field, the generation mechanism appears to be adequately described as an α2-dynamo with an anisotropic α-effect. The anisotropy in the α-effect favors an equatorial dipole field, however, which calls into question the interpretation in terms of an α2-dynamo. It is shown in this article with kinematic dynamo calculations and exemplary velocity fields with an anisotropic α-effect that both types of dipolar magnetic field can be generated. Two examples of working dynamos in a sphere with flows with zero α-effect are also provided.

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