2 Solar Spectra
21
Fig. 2.2 Atmospheric scattering and reflections of solar radiation received on a receiver surface.
The radiation received on the receiver surface (solar panel) comprises both: direct radiation and
diffuse radiation. It also comprises the albedo (see Sect. 2.2)
Fig. 2.3 The air mass ratio is the ratio of the atmospheric column at a given time, to the unit air
mass at mean sea level at over-head sun position