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 language | English |
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Pages (from-to) | 335-342 |
Number of pages | 8 |
Journal | Studia Geophysica et Geodaetica |
Volume | 42 |
Issue number | 3 |
DOIs | |
Publication status | Published - 1 Jul 1998 |
Externally published | Yes |
ASJC Scopus subject areas
- Geophysics
- Geochemistry and Petrology