An analysis of measured solar radiation data in Trabzon (lat, 41 degrees 10
'N, long. 40 degrees 20'E, placed on the Black Sea side) is presented in th
e form of hourly-average, monthly-average daily and percentage frequency di
stribution. The experimental data corresponds to the period from Jan. 1990
to Dec. 1993. Applying the measured data, correlation models for calculatin
g the hourly and monthly diffuse radiations are derived. (C) 1998 Elsevier
Science Ltd. All rights reserved.