Spectral Measurements of Solar Irradiance and Radiance in Clear and Cloudy Atmospheres - Short-Wave Solar Radiation in the Earth's Atmosphere - page 96

Fig. 3.6. Vertical profile of the spectral dependence of the solar semispherical irradiances
from the results of the airborne sounding 16th October 1983. Sand surface, solar zenith
angle 51 ◦
Fig. 3.7. Vertical profile of the spectral semispherical solar irradiance from the results of the
airborne sounding 29th April 1985. Snow surface, solar zenith incident angle 48 ◦