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Measurements of Spectral Radiance of the Horizon Sky

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Abstract

Typical spectral radiance data are presented for a rectangular portion of the horizon sky under various weather conditions and at different solar positions. Representative curves were selected from a total of seventy-nine spectral radiance measurements which covered meteorological ranges (at 665 mμ) from 10 km to 106 km and solar altitudes from −6° to 74°. The north horizon at noon with a 30-km or greater meteorological range typically produced a peak spectral radiance of 5 μW cm−2sr−1mμ−1. The maximum spectral radiance value obtained in the study was 38 μW cm−2sr−1mμ−1 for the south horizon in winter. The reciprocal dispersion varied from 1.8 mμ/mm at 400 mμ to approximately 8 mμ/mm at 1000 mμ. A mixture of fog and haze produced a spectral radiance curve with two maxima.

© 1967 Optical Society of America

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