Abstract
A study of the hourly, monthly, and annual variations of global and ultraviolet solar radiation and the meteorological parameters over a period of four year (1989–1992) over Cairo (30·05°N, 31·17°E) and Aswan (23·58°N, 32·47°E) in Egypt has been done. Measurements were carried out using Eppley ultraviolet radiometers by the Egyption Meteorological Authority. The global solar radiation was recorded using Eppley pyranometers. The correlations between the atmospheric transmission of ultraviolet solar radiation and clearness index and between ultraviolet and global solar radiation for Cairo and Aswan was also done. The correlations between the different variables by the linear regression analysis to estimate an empirical function relating global radiation to ultraviolet radiation and the meteorological parameters (temperature, water vapour pressure, and cloudiness) and a comparitive study between Cairo and Aswan has also been successfully carried out.
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