Estimation of the Regression Coefficients in Angstrom Correlation From Elevation in the Range 0-2000 M

Abstract

Using only the elevation of the location, equations are suggested for computing the regression coefficients a and b of Angstrom correlation. The equations for estimating a and b are developed from the global radiation and sunshine duration data reported, by various authors, for 29 locations in Africa and Europe. The developed equations are tested for applicability by computing global radiation for fifteen new locations spread all around the world. The agreement between the measured data reported for these stations and the estimated values is remarkable. It is suggested that this procedure can be employed to estimate global radiation for any location around the world.