An Investigation into High Conductivity Dynamo Action Driven by Rotating Convection

Details An Investigation into High Conductivity Dynamo Action Driven by Rotating Convection An Investigation into High Conductivity Dynamo Action Driven by Rotating Convection

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.5614k&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #56.14; Bulletin of the American Astronomical Society, Vol. 31, p.914

Astronomy and Astrophysics

Astronomy

Scientific paper

As a step towards constructing a physically realistic model of a fast dynamo, we study numerically the nature of the kinematic dynamo driven by convection in a rapidly rotating cylindrical annulus. Convection maintains the quasi-geostrophic balance whilst developing more complicated time-dependence as the Rayleigh number is increased. We incorporate the effects of Ekman suction and investigate dynamo action resulting from two chaotic flows obtained in this manner. We examine an ``effective'' growth rate as a function of magnetic Prandtl number Pm (proportional to the magnetic Reynolds number). Even for the largest value of Pm considered, a clearly identifiable asymptotic behaviour is not established. Nevertheless, the available evidence is suggestive of a fast dynamo process.

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