Abstract
The equilibrium radiance model, which assumes constancy in the source function
along the path of sight, predicts equilibrium radiance as a function of the
angle from the sun. Measurements made at all altitudes in the troposphere of
cloudless sky radiance in the visible spectrum consistently support this
prediction. As a result, sky radiances can be used to obtain (1) vertical
space-to-sensor scattering transmittance, (2) equilibrium radiance, and (3) path
radiance through the atmosphere and in the troposphere. Comparisons are made of
the constant equilibrium radiance model predictions of sky radiance, irradiance,
and equilibrium radiance to (1) other models for the Rayleigh atmosphere, and
(2) to measurements in the troposphere for thin atmospheres. The agreements are
good.
© 1984 Optical Society of America
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