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Spectral radiance measurements over the wavelength range of 0.24 to 0.28 microns were carried out using Ebert-type scanning spectrometers mounted on the aft section of an X-15 aircraft operating up to 270,000 ft altitude. With the assumption of Rayleigh scattering in the atmosphere and allowing for ozone absorption, the reflectance and albedo are estimated and compared with the measured values. The elevations and azimuths of the sun and of the spectrometer during the flight were tabulated and used to compute the scattering and diffuse reflection angles. Apparent reflection of radiation from the ground is estimated, using a Lambert radiator model. Since the spectrometer at times pointed away from the earth, it should be possible to estimate the separate contribution of the ground to the reflectance and total albedo. (Author).
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