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Title:
Dynamo action in stratified convection with overshoot
Authors:
Nordlund, Ake; Brandenburg, Axel; Jennings, Richard L.; Rieutord, Michel; Ruokolainen, Juha; Stein, Robert F.; Tuominen, Ilkka
Affiliation:
AA(Copenhagen University Observatory, Denmark), AB(NORDITA, Copenhagen, Denmark; Helsinki, University, Observatory, Finland), AC(Cambridge, University, England), AD(Observatoire Midi-Pyrenees, Toulouse, France), AE(Centre for Scientific Computing, Espoo, Finland), AF(Michigan State University, East Lansing), AG(Helsinki, University, Observatory, Finland)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 392, no. 2, June 20, 1992, p. 647-652. Research supported by SERC, SNFO, and Danish Space Board. (ApJ Homepage)
Publication Date:
06/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
CONVECTIVE FLOW, CORIOLIS EFFECT, DYNAMO THEORY, MAGNETOHYDRODYNAMICS, STELLAR INTERIORS, TURBULENT FLOW, MAGNETIC FLUX, PRANDTL NUMBER, REYNOLDS NUMBER, THREE DIMENSIONAL MODELS
DOI:
10.1086/171465
Bibliographic Code:
1992ApJ...392..647N

Abstract

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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