Dynamo action in a uniform ambient field

Details Dynamo action in a uniform ambient field Dynamo action in a uniform ambient field

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999pepi..111...47s&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 111, Issue 1-2, p. 47-68.

Physics

10

Scientific paper

The generation of magnetic fields by convection in a rapidly-rotating, conducting fluid sphere is investigated in the presence of a uniform ambient field. A two azimuthal mode approximation is used, giving a relatively tractable system nevertheless capable of self-consistent field generation. In weak imposed fields, `magnetoconvective' solutions are found, where magnetic fields hundred of times the ambient field strength can be generated from the latter by convection incapable of self-sustained dynamo action. The polarity of ambient field determines that of the generated field. Such solutions are only stable for relatively weak applied fields, and relatively weakly driven convection; outside this regime, the system is unstable to stronger field solutions which are essentially self-sustained dynamos. Although the ambient field is less important for these solutions, for sufficient ambient field strengths it still leads to enhanced generated field strengths and imposes a fixed polarity. Both solution types may be of some relevance to the moons of the giant planets.

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