Abstract
The effect of poor selection of the sky radiance distribution on the calculation of shadowband correction factors is examined for three different sky radiance distributions. The accepted use of an isotropic distribution to describe clear sky conditions is found to be in error and responsible for pseudo-monthly variance in the additional shadowband correction factors. Use of a sky radiance distribution of the form (α+β cos ϑ)−1 where α and β are constants, typically 0.25 and 0.75 respectively, is shown to give excellent results. The additional shadowband correction factors for clear and totally cloudy skies are found to be constant throughout the year, having values +5% and 0.0% respectively. These results were found at a site where the mean turbidityβγ was less than 0.080.
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