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A study of solar photospheric limb-darkening variations
Petro, L. D.; Foukal, P. V.; Rosen, W. A.; Kurucz, R. L.; Pierce, A. K.
AA(Kitt Peak National Observatory, Tucson, AZ; Atmospheric and Environmental Research, Inc., Cambridge, MA), AB(Kitt Peak National Observatory, Tucson, AZ; Atmospheric and Environmental Research, Inc., Cambridge, MA), AC(Kitt Peak National Observatory, Tucson, AZ; Vassar College, Poughkeepsie, NY), AD(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AE(Kitt Peak National Observatory, Tucson, AZ)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 283, Aug. 1, 1984, p. 426-438. (ApJ Homepage)
Publication Date:
Solar Physics
NASA/STI Keywords:
Limb Darkening, Photosphere, Solar Atmosphere, Temperature Distribution, Atmospheric Models, Convection, Radiative Transfer, Variability
Bibliographic Code:


The authors have obtained regular observations of photospheric limb darkening, using the McMath Solar Telescope, to study possible slow changes in the global temperature structure, in Teff, and in the ultraviolet continuum flux from the quiet Sun. This paper reports on the analysis of data obtained on 15 days between 1980 September and 1982 December in a continuum window at lambda4451. There are no variations of global limb darkening exceeding 0.1% at the 99% confidence level. The implications of these measurements for slow changes in solar luminosity, convection zone structure, and ultraviolet flux are discussed.

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