A mean Angstrom turbidity of 0.11 is derived for Australian skies. The method is based on an algorithm for computing clear sky global irradiance and uses global pyranometer data, which are more widely available than the spectral observations of direct beam irradiance conventionally employed. Comparisons with conventional turbidity measurements at Darwin and Aspendale provide support for the method.
G. Allen (Sun,) studied this question.
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