Physics
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232..282p&link_type=abstract
Astrophysical Journal, Part 1, vol. 232, Aug. 15, 1979, p. 282-296.
Physics
13
Aerodynamic Drag, Convective Flow, Heat Transmission, Magnetic Flux, Magnetohydrodynamics, Solar Magnetic Field, Solar Physics, Sunspots, Acceleration (Physics), Boussinesq Approximation, Cylindrical Bodies, Draft (Gas Flow), Magnetohydrodynamic Stability
Scientific paper
The effect of negative aerodynamic drag in an ideal fluid subject to convective instability is considered. It is shown that a cylinder moving in such a fluid is propelled forward in its motion by the convective forces and that the characteristic acceleration time is comparable to the onset time of convective motions in the fluid. It is suggested that convective propulsion plays an important role in the dynamics of flux tubes extending through the surface of the sun. The suppression of the upward heat flow in a Boussinesq convective cell with free upper and lower boundaries by a downdraft is then analyzed. Application to the solar convection zone indicates that downdrafts of 1 to 2 km/s at depths of 1000 to 4000 km beneath the visible surface of the sun are sufficient to reduce the upward heat flux to a small fraction of the ambient value.
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