Buoyancy-limited thin shell dynamos

Details Buoyancy-limited thin shell dynamos Buoyancy-limited thin shell dynamos

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...240..142m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 240, no. 1, Dec. 1990, p. 142-149.

Astronomy and Astrophysics

Astrophysics

36

Dynamo Theory, Magnetohydrodynamics, Solar Cycles, Spherical Shells, Buoyancy, Convection Currents

Scientific paper

Axisymmetric nonlinear mean-field dynamos in spherical shells are investigated that attempt to model the gross effects of a dynamo operating in a thin layer at the base of a convective envelope. A form of magnetic buoyancy restricts the fields to finite amplitude. As the shell thickness decreases, the excitation conditions and spatial structure of even and odd parity modes become almost identical. For very thin shells the field forms a number of almost disjoint cells. Mixed parity solutions are found which typically evolve very slowly toward pure odd or even parity solutions. The time scale of these slow variations is of the order of a hundred global diffusion times.

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