Abstract

Hourly measurements for each of the five solar bands selected by the filters of the Volz multichannel sunphotometer together with ambient air temperature and relative humidity are carried out. Figures and tables are given to show variation of precipitable water, relative, humidity, vapor pressure, ambient air temperature, and turbidity. An empirical relation is obtained to show the variation of vapor pressure at ground surface with precipitable water layer through the atmosphere of Cairo.

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