3. Atmospheric extinction
Atmospheric extinction (or attenuation) results from the superposition of two distinct physical processes: absorption and diffusion. These processes apply equally to molecules, aerosols, mists and rain.
Extinction is the sum of :
molecular absorption and diffusion ;
aerosol absorption and diffusion ;
extinction by rain and snow.
3.1 Molecular absorption and atmospheric windows
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Atmospheric extinction
Attenuation and overall transmission
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