Summary of Sky Brightness Measurements During Eclipses of the Sun

W. E. Sharp; S. M. Silverman; J. W. F. Lloyd

doi:10.1364/AO.10.001207

Applied Optics
Vol. 10,
Issue 6,
pp. 1207-1210
(1971)
•https://doi.org/10.1364/AO.10.001207

Summary of Sky Brightness Measurements During Eclipses of the Sun

W. E. Sharp, S. M. Silverman, and J. W. F. Lloyd

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W. E. Sharp, S. M. Silverman, and J. W. F. Lloyd, "Summary of Sky Brightness Measurements During Eclipses of the Sun," Appl. Opt. 10, 1207-1210 (1971)

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Abstract

A selected group of measurements of the sky brightness during total solar eclipses is used to determine a standard light curve during the period from no obscuration to totality. It is found that the sky light may be considered as attenuated sunlight up to at least 99.8% obscuration. During totality, the sky light consists of multiply scattered light from outside the umbral region. The effects of solar elevation angle, cloud cover, and albedo and the variability of the light curve during totality are discussed.

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No.	Date	Location	Solar elevation	Type of measurement	Meteorological conditions; terrain	Observers	Ref. No.
1	1925	41°28′N	17°	Illumination due to whole sky	Var. cloudiness; snow	Illum. Eng. Soc. of N.Y.	11
		74°W		Illumination due to whole sky	Var. cloudiness; snow	Illum. Eng. Soc. of N.Y.
2	1927	54°19′N	12.5°	Illumination due to whole sky excluding sun	Overcast; green vegetation	Staff of NPL	12
		1°50′W		Illumination due to whole sky excluding sun	Overcast; green vegetation	Staff of NPL
3	1947	17°13′S	40°	Illumination due to 20 of zenith sky	Thin cirrus; green vegetation	Richardson, Hulburt	13
		43°41′W		Illumination due to 20 of zenith sky	Thin cirrus; green vegetation	Richardson, Hulburt
4	1952	18°32′N	61°	Sky brightness in the zenith	Slight dust in air; desert	Batchelder et al.	14
		35°33′E		Sky brightness in the zenith	Slight dust in air; desert	Batchelder et al.
5	1963	61°25′N	49°	Zenith intensity in small wavelength int.	Clear above; clouds below	Deehr and Rees	8
		117°13′W
		Aircraft
6	1963	44°48′N	24°	Zenith intensity in small wavelength int.	Patchy clouds; green vegetation	Sharp et al.	3
		88°57′W		Zenith intensity in small wavelength int.	Patchy clouds; green vegetation	Sharp et al.

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Applied Optics