الفهرس 
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Abstract
ACKNOWLEDGMENT
Pirst of all I thank GOD who helped me greatly in this work.
I would like to express my deep appreciation to Prof. Dr.
Mohamed B. Abdel-Latif for his sincere supervision and
guidance as well as his endless support throughout the
course of this ~ork.
Also, I am indbted to Prof. Dr. Ahmed S. EL-Sabbagh for his
encouragement and great help.
Thanks are due to ’’ The Puplic Authority For Meteorolgical ••
for suppling the solar radiation data. Thanks are also due
to all who have offered any direct or indirect help.