Abstract
Total (global) solar radiation, H, and diffuse solar radiation, H d were measured at Ilorin (8° 30′N 4° 42′E) Nigeria. From these, the daily values of H H 0 and H d H were computed, where H 0 is the extraterrestrial radiation. The relationship between the two ratios and their variation with the prevailing atmospheric conditions were examined. The ratios were found to be opposite in characteristics. H H 0 has high values in clear atmospheres and low values in cloudy or turbid atmospheres; and vice-versa for H d H . The two ratios are negatively linearly related and with this fact, two simple mathematical models were obtained for estimating H d H in terms of H H 0 .
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