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In the present analysis broad-band turbidity coefficients, which depend upon the attenuation over the entire solar spectrum, are presented. These coefficients are determined from unfiltered pyrheliometric observations of normal incidence direct solar irradiance. Thus, the Linke turbidity factor T L and the Unsworth-Monteith attenuation coefficient T UM were calculated from pyrheliometric...
Six years of hourly global and diffuse irradiation measurements on a horizontal surface performed at Athalassa, Cyprus, are used to establish a relationship between the daily diffuse fraction and the daily clearness index. Two types of correlations--yearly and seasonal--have been developed. These correlations, of first and third order in the clearness index are compared to the various correlations...
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