Abstract
Results of a detailed analysis of a large set of sky radiance measurements taken in 1982 by the SKYSCAN system are presented. The SKYSCAN system, an automated robot system built and operated at the University of Toronto, takes narrow field-of-view sky radiance measurements with a precision and frequency adequate for most analysis and modelling purposes. The analysis of these data has confirmed the supposition that clouds strongly affect the distribution of the diffuse radiance. It has shown that the spatial distribution of the radiance for skies categorized according to cloud type and amount is statistically influenced in an orderly manner by the presence of the clouds. The data appeared to be generally compatible with a model of the form of the Three-Component Continuous Distribution (TCCD) model introduced by Hooper and Brunger, and suggested that successful descriptors of the sky radiance could be developed based on that model, or on similar formulations.
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