Dynamo action in stratified convection with overshoot

Details Dynamo action in stratified convection with overshoot Dynamo action in stratified convection with overshoot

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...392..647n&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 392, no. 2, June 20, 1992, p. 647-652. Research supported by SERC, SNFO, an

Astronomy and Astrophysics

Astrophysics

169

Convective Flow, Coriolis Effect, Dynamo Theory, Magnetohydrodynamics, Stellar Interiors, Turbulent Flow, Magnetic Flux, Prandtl Number, Reynolds Number, Three Dimensional Models

Scientific paper

Results are presented from direct simulations of turbulent compressible hydromagnetic convection above a stable overshoot layer. Spontaneous dynamo action occurs followed by saturation, with most of the generated magnetic field appearing as coherent flux tubes in the vicinity of strong downdrafts, where both the generation and destruction of magnetic field is most vigorous. Whether or not this field is amplified depends on the sizes of the magnetic Reynolds and magnetic Prandtl numbers. Joule dissipation is balanced mainly by the work done against the magnetic curvature force. It is this curvature force which is also responsible for the saturation of the dynamo.

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