Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...385..746k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 385, Feb. 1, 1992, p. 746-757.
Astronomy and Astrophysics
Astrophysics
3
Compressible Flow, Magnetic Field Configurations, Magnetic Flux, Solar Interior, Solar Magnetic Field, High Reynolds Number, Magnetohydrodynamic Flow, Turbulent Flow
Scientific paper
Three-dimensional cellular convection concentrates magnetic field into thin ropes and sheets when the magnetic Reynolds number is large. The equilibrium structure of an axisymmetric flux rope sustained by turbulent, cellular convection of a compressible, electrically conducting gas is examined. The back-reaction of the magnetic field on the turbulent flow is modeled in both the momentum and energy equations. Using boundary-layer techniques, it is shown that compressibility of the fluid is responsible for a non-Boussinesq boundary-layer effect which is termed 'cooling runaway'. This is a thermal breakdown which realizes in this model the convective collapse associated with superadiabatic effects. Cooling runaway may limit the flux carried by basic magnetic structures which are formed in the upper layer of the solar convection zone.
Childress Stephen
Kerswell Richard
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