Physics – Optics
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apopt..18.2362s&link_type=abstract
Applied Optics, vol. 18, July 15, 1979, p. 2362, 2363.
Physics
Optics
1
Atmospheric Optics, Radiative Transfer, Sky Brightness, Solar Eclipses, Atmospheric Models, Light Scattering, Photometers, Photons, Prediction Analysis Techniques
Scientific paper
The paper is concerned with the experimental verification of the radiative transfer model developed by the author (1978) to account for the brightness of the eclipsed sky. In the present paper, the radiative n = 2 model is tested with the measurements of zenith sky brightness taken during the 26 February 1979 solar eclipse at Butte, Montana (46.1 deg N, 112.6 deg W, 1580 m above mean sea level). In this eclipse the solar elevation angle was 19.4 deg, the umbra diameter was 100 km, and totality lasted for 157 + or - 3 sec. Meteorological conditions were poor, with broken cirrus decks estimated at 2438 m and 3657 m overhead. Measurements of the zenith radiance were made in three 50-A-wide wavelength passbands: 3809 A (UV), 5008 A (green), and 6080 A (red). When the model for n = 2 scattering processes is evaluated for conditions during the Montana eclipse, the model's predicted values of zenith radiance agree quite closely with those observed. The presence of thin cloud deck overhead would darken an eclipse by 14-32%.
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