The variability of the daily solar radiation components over Helwan

摘要

Measurement of different components of solar radiation were carried out in Helwan, Cairo, Egypt. Helwan (Lat. 29deg.c 52'N, Long. 31deg 20' E) is considered the largest polluted region in The world and, the sources of pollution are cement, engineering, iron and steel factories. The Data measurements are carried out from sunrise (SR) to sunset (SS) through 4 yr.