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The brightness distribution of the overcast sky when the ground is snow-covered

✍ Scribed by P. Petherbridge

Publisher
John Wiley and Sons
Year
1955
Tongue
English
Weight
186 KB
Volume
81
Category
Article
ISSN
0035-9009

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✦ Synopsis

Abstract

Measurements have been made of the brightness distribution of a densely overcast sky when the ground was covered with snow. The distribution proved to be moze uniform than has been reported for normal ground conditions.

The distribution was found to be somewhat asymmetric, which may have been due to differences in cloud thickness or to the local influence of inter‐reflections between the base of the cloud and the ground below.

The averaged data were found to be represented with reasonable accuracy by the empirical formula: B~ΞΈ~ = 1/2 B~Z~ (1 + cos ΞΈ) where B~ΞΈ~ = brightness of the sky at zenith angle ΞΈ and B~Z~ = brightness of the sky at the zenith.

The reflection factor of the snow was measured and found to be 80 per cent.

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