On a physically realistic fast dynamo

Eun Jin Kim, D. W. Hughes, A. M. Soward

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Abstract

As a step towards a physically realistic model of a fast dynamo, we study numerically a kinematic dynamo driven by convection in a rapidly rotating cylindrical annulus. Convection maintains the quasi-geostrophic vbalance 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 a chaotic flow obtained in this manner. We examine the growth rate as a function of magnetic Prandtl number Pm, which is 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 strongly suggests a fast dynamo process.

Original languageEnglish
Pages (from-to)335-342
Number of pages8
JournalStudia Geophysica et Geodaetica
Volume42
Issue number3
DOIs
Publication statusPublished - 1 Jul 1998
Externally publishedYes

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ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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