Knowledge Bank

“Data will be presented to show the measured spectral radiance of the sky (0$\circ K$ reference temperature) in the one to twenty microns wavelength region. The relative importance of atmospheric $emission1,2,3,4$ and scattered sunlight will be shown. The importance of the temperature, water vapor content, altitude, sun angle, elevation, and azimuth will be illustrated with typical spectra. A semi-quantitative explanation of the effects of these variables will be given on the basis of a simple model of the atmosphere.”