Abstract
The absolute intensity of the diffuse day skylight, in the zenith, has been measured with rocketborne instrumentation. It is reported in radiometric units at a wavelength of 5500 Å. The measurements show good consistency with independent measurements at sea level and above 90 km. A simple Rayleigh scattering model of the upper atmosphere explains the exponential variation of intensity with height. The intensity variation yields a scale height of 6.3 km for the height range 20 km to 90 km.
© 1965 Optical Society of America
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