RELATIONSHIP BETWEEN GLOBAL RADIATION, DIFFUSE SKY RADIATION AND EXTRA-TERRESTRIAL RADIATION IN AUSTRIA

On the basis of the published datas of global- and diffuse sky radiation from Wien-Hohe Warte (altitude above sealevel 202 m), Salzburg (446 m) and Sonnblick (3106 m) the relationship after Liu-Yordan [3] for monthly and hourly sums were calculated for this three stations. By these relationships it is possible to estimate diffuse sky radiation from the datas of global radiation for Wien, and Salzburg with high accuracy. For Sonnblick however the estimated datas are diverging from the measured with large standard deviation. Errors that occur by using relationships, which were not estimated at the concrete location, are presented. © 1979 Springer-Verlag.