Modeling Solar Radiation at the Earth’s Surface

Clear Day Horizontal Beam Irradiation

The clear day horizontal beam irradiation is also defined as that incident on a hor­izontal surface on a clear day, viz., KT > 0.7. The clear day horizontal beam index Kbc is defined in terms of the extraterrestrial solar irradiation Ho as

Kb, c = Hb/Ho for Kt > 0.7 (4.12)

where Hb is the horizontal beam irradiation on a clear day. Once again, if there is a particular month with either a very small number or zero days that meet the KT > 0.7 threshold, then it may be lowered by small deficits.

The solar horizontal beam irradiation database consisting of the years 1991 to 2006 was utilized to perform an in-depth analysis similar to that performed for the horizontal diffuse irradiation and the results are presented in Fig. 4.5.

Fig. 4.5 Analysis of the solar horizontal beam irradiation for Beer Sheva (1991-2006)

It is observed from Fig. 4.5, that the magnitudes of the monthly average clear day horizontal beam irradiation values based upon the Iqbal filter are closest to the corresponding average of the maximum daily horizontal beam irradiation measured each year. Also, it is observed that the magnitudes of the monthly average daily hor­izontal beam irradiation values approach that of the corresponding Iqbal filter values during the summer months. This, once again, testifies to the prevalence of clear sky conditions during the summer months in Beer Sheva, cf., Ianetz et al. (2000).

Modeling Solar Radiation at the Earth’s Surface

Quality Assessment Based Upon Comparison with Models

Many models based on the physics of radiation transfer through the clear atmo­sphere have been developed (Lacis and Hansen 1974; Atwater and Ball 1978; Hoyt 1978; Bird and Hulstrom 1981a, …

Solar Horizontal Diffuse and Beam Irradiation on Clear Days

There exist a number of models to determine the solar horizontal diffuse irradia­tion on a clear day (Kondratyev 1969) but they are complex and have very stringent conditions. Similarly, there …


Reading the twenty chapters of this book caused me mixed reactions, though all were positive. My responses were shaped by several factors. Although I have main­tained a “watching brief’ on …

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