Abstract
A series of experimental measurements of the visible light angular transmittance profiles of clouds is described. The results for single-layer overcast clouds were found to correlate well with standard hemispheric and narrow-angle pyrheliometric transmittances. The resulting expression for the angular transmittance profile of an overcast cloud layer is T(θ) = A+B sin2θ, where A = −0.0056+0.89Tn , and B = −0.028+1.09Tw, and T is the transmittance measured for a field of view at the detector subtending a half angle θ centered about the sun or other light source, Tn the transmittance measured with a narrow-angle pyrheliometer, and Tw the transmittance measured with a hemispheric pyrheliometer.
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