Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...253l..89r&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 253, Feb. 15, 1982, p. L89-L93.
Astronomy and Astrophysics
Astrophysics
12
Limb Darkening, Photosphere, Solar Flux, Solar Limb, Solar Constant, Solar Temperature
Scientific paper
The paper reports on photospheric limb-darkening measurements obtained with the McMath Solar Telescope in July, September, and October 1980 as part of a continuing program to investigate possible long-term variations in the photospheric emergent flux. A total of 243 usable full-diameter scans were recorded over seven days in the clean continuum window at 4451-25 A. The limb darkening was found to decrease significantly between September 25 and 26. It is suggested that this decrease was caused by a decrease of the temperature gradient in the upper photosphere in the region above approximately tau(5000) = 0.5. The small increase in effective temperature that might accompany this limb-darkening variation is estimated using a standard radiative equilibrium photospheric model.
Foukal Peter V.
Kurucz Robert L.
Pierce Keith A.
Rosen W. A.
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