Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...294...57p&link_type=abstract
Astrophysical Journal, Vol.294, NO. 1/JUL01, P. 57, 1985
Astronomy and Astrophysics
Astrophysics
12
Scientific paper
The linearized equations of motion of a fibril magnetic field and the mean fluid motion through that field are used to illustrate the convective counterflow effect. The calculations show that starting from static equilibrium, a vertical impulse applied to a cluster of fibrils (represented by a cluster of parallel circular cylinders) may result in the fluid moving either upward or downward across the cluster, depending on the eccentricity of the cross section of the cluster and the strength of the aerodynamic drag coupling the fluid and fibrils. Specifically, a flattened cluster of fibrils, with a width in excess of twice the thickness, may be carried in the opposite direction from the initial applied impulse by the associated counter convective motion. It appears that this counterflow effect may operate in the upper few thousand km of the convective zone of the Sun, where it would play a role in suppressing the buoyant rise of magnetic flux tubes to the surface. Hence the convective counterflow may take an active part in controlling the emergence of flux tubes through the surface of a star like the Sun, perhaps regulating to some degree the form and general level of the activity of the star.
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