AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 56. New Views of the Solar Interior
Solar, Display, Tuesday, June 1, 1999, 10:00am-7:00pm, Southeast Exhibit Hall

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[56.14] An Investigation into High Conductivity Dynamo Action Driven by Rotating Convection

E. Kim (HAO, NCAR), D.W. Hughes (Dept. of Applied Maths. Univ. of Leeds), A.M. Soward (Dept. of Maths. Univ. of Exeter)

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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