When the sky is clear, about 20% of visible lightAbsorption depends highly on wavelength is absorbed or reflected by. For the atmosphere, depending slightly on1550 nm wavelength. When it's cloudy used here, this risesNASA calculated the absorption in dB as a function of viewing angle: thin clouds absorb or reflect ~30%, thick clouds up to 90%.
When the sky is clear, about 20% of visible light is absorbed or reflected by the atmosphere, depending slightly on wavelength. When it's cloudy, this rises: thin clouds absorb or reflect ~30%, thick clouds up to 90%.
Absorption depends highly on wavelength. For the 1550 nm wavelength used here, NASA calculated the absorption in dB as a function of viewing angle:
