Physics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..136..201d&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 136, Dec. 1991, p. 201-219. Research supported by ISRO.
Physics
31
Convective Flow, Dynamo Theory, Kelvin-Helmholtz Instability, Magnetic Flux, Solar Magnetic Field, Coriolis Effect, Magnetic Signatures, Photosphere
Scientific paper
The effects of Kelvin-Helmholtz instability (KHI) on tubes emerging from the bottom of the convection zone are investigated. The effect of KHI in a symmetic flux ring caused by the azimuthal flow induced during its rise is included. It is found that the azimuthal flow crosses the threshold for the instability only if there is a giant cell upflow to drag the flux tubes appreciably. In the absence of such a drag, as in the case of a passive convection zone or in the case of momentum exchange by small-scale turbulence, the azimuthal velocity never becomes large enough to cause the instability, leaving the results of the previous calculations unaltered. The giant cell drag, aided by KHI, now becomes a viable mechanism for curbing the Coriolis force - 10,000-G flux tubes with radii of a few hundred km being dragged radially by upflows of 70 m/s.
Choudhuri Arnab R.
D'Silva Sydney Z.
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