EFFECT OF WEATHER CONDITIONS ON UV-B RADIATION REACHING THE EARTHS SURFACE

No increase has been found in the long-term UV-B data series despite o zone depletion. This is partly due to the fact that atmospheric parame ters strongly affect UV-B values measured at the surface of the earth. The aim of our study is to determine relationships between UV-B and a tmospheric parameters. The parameters studied in this work were cloudi ness, transparency of atmosphere and global radiation. Useful relation ships were found for each of these parameters. Clouds can significantl y reduce UV-B radiation if cloud cover is greater than 50%. UV-B radia tion increases with increasing wide range transparency of the atmosphe re; this increase grows stronger as the sun rises. Good correlation wa s found between the ratio of UV-B to transformed global radiation and total ozone. A radiation amplification factor (RAF) value of 0.9 was o btained.