Physics – Optics
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apopt..14.2831g&link_type=abstract
Applied Optics, vol. 14, Dec. 1975, p. 2831-2837.
Physics
Optics
6
Atmospheric Optics, Color, Horizon, Sky Brightness, Solar Eclipses, Atmospheric Models, Atmospheric Scattering, Elevation Angle, Light Scattering
Scientific paper
A theory for the color of the sky near the horizon for an observer in the umbral region of a total solar eclipse is presented. The model uses a Rayleigh scattering atmosphere, and the light reaching the observer is a beam of singly scattered sunlight, which, in turn, has suffered depletion by scattering in its passage from outside the shadow region. The model predicts both the red color observed in the lowest 8 deg of the sky for the total solar eclipse of June 30, 1973 and the enriched blue color of the sky at any elevation angle greater than the solar elevation angle. The model is also adapted to explain the reddening of the horizon sky observed during such times as when a dark cloud passes overhead or when the light from a large city is seen from the distance at night.
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