Solar radiation can be calculated in terms of ambient temperature. Temperature measurements can be used to estimate the solar energy received per unit area.  The most widely used and oldest model is the Angstrom model. The amount of global radiation is obtained by summing the direct, diffused, and terrain-reflected components at the earth's surface.  The monthly average daily global solar irradiation on horizontal surface can be estimated using the linear exponential regression equation H/Ho = 0.1949 + 0.4771(n/N) + 0.02994 exp(n/N).  Solar radiation can be estimated using a variety of... Show more

Solar radiation can be calculated in terms of ambient temperature. Temperature measurements can be used to estimate the solar energy received per unit area.  The most widely used and oldest model is the Angstrom model.
The amount of global radiation is obtained by summing the direct, diffused, and terrain-reflected components at the earth's surface. 
The monthly average daily global solar irradiation on horizontal surface can be estimated using the linear exponential regression equation H/Ho = 0.1949 + 0.4771(n/N) + 0.02994 exp(n/N). 

Solar radiation can be estimated using a variety of factors, including:
Location and meteorological parameters: These include latitude, longitude, altitude, sunshine hour, air temperature, wind speed, cloud cover, humidity, and days of a month.
Input variables: These include temperature, relative humidity, and atmospheric pressure.
Geometric relations: These include the sun and the earth's surface, atmospheric attenuation, and topographic factors. 

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