ULTRAVIOLET SOLAR-RADIATION OVER EGYPT

Measurements were carried out at Cairo and Aswan in Egypt for three ye ars (1990-1992) using Eppley Ultraviolet Radiometers by the Egyptian M eteorological Authority. Also, the global solar radiation was recorded for the same three years at Cairo and Aswan using Eppley pyranometers . All the meteorological conditions of the two cities are collected, a nd the stratospheric ozone is measured by Dobson spectrophotometers. T he ratio of the ultraviolet to the global radiation (UV/G) range betwe en 2.7% (in winter) to 3.4% (in summer) for Cairo (lat. 30 degrees). A swan in the south of Egypt (lat. 23.5 degrees) shows the inverse, wher e the ratio of ultraviolet to global solar radiation (UV/G) range betw een 3.9% (in winter) to 3.5% (in summer).