Facular influences on the apparent solar shape

Details Facular influences on the apparent solar shape Facular influences on the apparent solar shape

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983natur.304..326d&link_type=abstract

Nature (ISSN 0028-0836), vol. 304, July 28, 1983, p. 326-328. NSF-supported research.

Physics

6

Faculae, Solar Limb, Ellipticity, Shapes, Stellar Structure

Scientific paper

Summer 1982 observations of solar faculae (Libbrecht and Kuhn), at an angular resolution of about 3 deg around the limb, are analyzed in terms of the facular contribution to the oblateness signal, and the results are used to confirm the 1966 solar-ellipticity measurements (Dicke and Goldenberg, 1974). A statistical study of the 1966 measurements shows that the 'ellipticity signal' persisted even on the 20-30 percent of the 1966 observational days when facular signals, as measured by the facular function Fc of Chapman and Ingersoll (1972), were negligible. The 1982 data are found to be consistent with the function for the variation of facular contrast with position derived by Schatten and Sofia (1983), making it unlikely that the 1966 ellipticity data were significantly contaminated by facular effects near the limb.

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