Generation of magnetic fields by convection in a rotating sphere. I

Details Generation of magnetic fields by convection in a rotating sphere. I Generation of magnetic fields by convection in a rotating sphere. I

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981pepi...24..272c&link_type=abstract

Physics of the Earth and Planetary Interiors, vol. 24, Mar. 1981, p. 272-283. NSF-supported research.

Physics

26

Conducting Fluids, Convective Flow, Dynamo Theory, Magnetohydrodynamic Flow, Planetary Magnetic Fields, Rotating Fluids, Computer Techniques, Field Strength, Mathematical Models, Rayleigh Number, Rotating Spheres, Spheres

Scientific paper

The magnetohydrodynamic dynamo problem is solved for an electrically conducting spherical fluid shell with spherically symmetric distributions of gravity and heat sources. The dynamics of motions generated by thermal buoyancy are dominated by the effects of rotation of the fluid shell. Dynamos are found for low and intermediate values of the Taylor number (less than or equal to 10 to the 5th) if the scale of the nonaxisymmetric component of the velocity field is sufficiently small. The generation of magnetic fields of quadrupolar symmetry is preferred at Rayleigh numbers close to the critical value for onset of convection. As the Rayleigh number increases, the generation of dipolar magnetic fields becomes preferred.

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