Accession Number : AD0774597

Title :   Airborne Measurements of Optical Atmospheric Properties in Southern Illinois,

Corporate Author : SCRIPPS INSTITUTION OF OCEANOGRAPHY SAN DIEGO CALIF VISIBILITY LAB

Personal Author(s) : Duntley,Seibert Qu. ; Johnson,Richard W. ; Gordon,Jacqueline I.

Report Date : JUL 1973

Pagination or Media Count : 250

Abstract : The report presents daytime atmospheric optical data collected chiefly with airborne instruments during a field expedition to southern Illinois in the summer of 1971. Results from five flights are presented. The data include the natural irradiance upon horizontal plane surfaces, scalar irradiances, total volume scattering coefficients, atmospheric beam transmittances, path radiances, directional path reflectances, and directional terrain reflectances. Data for sunlight conditions were derived for downward-looking pahts of sight inclined at six zenith angles (95, 100, 105,120, 150, and 180 degrees) from altitudes of 3000 meters above ground level and lower in three spectral regions, as follows: two narrow band optical filters with mean wavelengths of 478 and 664 nanometers; and one broad band sensitivity representing the photopic response with a mean wavelength of 557 nanometers. (Author)

Descriptors :   *Atmospheres, *Optical data, *Illinois, Light transmission, Light scattering, Transmittance, Reflectance, Radiance, Radiometry, Statistical data, Tables(Data)

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE