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Conclusions

In order to bring the error of measured absolute irradiance values to within ± 5 %, correction for the temperature dependent response, temporal variation of response and the angular dependence of the collector are essential. The corrected DUV values for clear sky conditions are in much closer agreement with a theoretical model and generally show better correlation with that model compared to the uncorrected values.

Correction of the data at the four sites studied, fall in the range - 27 to 21 %. Clear-sky corrected DUV values fall in much closer agreement with TOMS-inferred DUV values. The average differences between clear-sky TOMS-inferred and corrected DUV values are in the range of - 11 to 3 %, with the smallest average value of 3 % corresponding to the Rocky site.