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RADIANCE OF THE UPPER ATMOSPHERE IN THE MIDDLE ULTRAVIOLET,
AEROSPACE CORP EL SEGUNDO CALIF
Solar irradiance scattered from the earths atpssphere was measured in the middle ultraviolet from an Air Force satellite launched in July 1962. The radiomelter defined a wavelength region centered at 2550A with a bandpass at half maximum of about 140A. The effecevve field of view was 1.2 x 10 to the -4 sterad. Due to the late afternoon launch, the minimum angle between the sun direction and the local zenith at the satellite during the flight was 49 deg. The radiance values reached a maximum at these positions and decreased as the vehicle moved toward the shadow region. The maximum radiance value measured was 2.0 0.3 x 10 to the -9 wsq cm -sterad-A. No signal was observed when the vehicle passed over the dark side of the earth. The results compare well with recent theoretical calculations and other experimental measurements. Author