Abstract
Solar radiation, ground surface and air temperatures change periodically day by day. Then we measured the surface temperature, air temperature, humidity and wind velocity on various types of land covers such as concrete, asphalt, soil and grass every hour for one cycle namely 24 hours. The relationship between the diurnal radiant energy from ground surface and air and global solar irradiance were studied as a function of time. A linear relationship was established between them, when the phases of them were synchronized. The values of parameters of the relationship were determined using experimental data and compared with the estimated values using the radiation balance model. Finally, we tried to estimate the surface radiant energy in a day using Landsat/TM data.
