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  • Author or Editor: Richard T. Hall x
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Richard T. Hall and R. Douglas Rawcliffe


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,


           A = −0.0056+0.89T n , and B = −0.028+1.09T w,

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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