Computer Science
Scientific paper
May 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.303..292d&link_type=abstract
Nature (ISSN 0028-0836), vol. 303, May 26, 1983, p. 292-295. NSF-supported research.
Computer Science
10
Solar Rotation, Solar Velocity, Cores, Doppler Effect, Eddington Approximation, Least Squares Method, Perturbation, Photosphere
Scientific paper
Recently observed velocity variations in the solar rotation are taken to indicate the presence of a rotating, distorted gravitational potential. The data covered the whole solar disk measured spectroscopically as a Doppler shift. A rotation within 0.2 day of 13.1 day, with a 6.5 m/sec amplitude, was calculated, in agreement with the Dicke (1966) solar oblateness measurements. A robust procedure was employed to eliminate most errant data points. It is argued that the conditions for radiative equilibrium are a dominant force and are also incompatible with mechanical conditions for equilibrium, thereby suggesting an acceleration of surface currents. Analytical formulations are considered for the perturbations expected from a rigidly rotating distorted core. The l=3 harmonic is found to be the source of the circulation current which, in concert with the l=2 and l=4 distortions, could indicate a complex configuration for any magnetic field in the solar core. Centrifugal distortion of the surface current could produce an Eddington-Sweet current with a flow from the equator to the poles.
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