Accession Number : ADA114637

Title :   Airborne Measurements of European Sky and Terrain Radiances.

Descriptive Note : Scientific interim rept. no. 19,

Corporate Author : SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA VISIBILITY LAB

Personal Author(s) : Johnson,Richard W

PDF Url : ADA114637

Report Date : Aug 1981

Pagination or Media Count : 36

Abstract : A data set which contains nearly 500 arrays representing measurements of sky and terrain radiance values from 47 different flights is described and illustrated. The measurements were made using radiometer systems mounted on a C-130 aircraft during a series of European flights associated with the NATO program OPAQUE. Radiance measurements throughout the 4 pi field surrounding the aircraft were made in four spectral bands having mean wavelengths of 478, 557, 664, and 765nm. Spectral sets of measurements were made at each of several altitudes between the surface and approximately 6 km AGL. Evaluation of the data illustrates good orientation and radiometric accuracies, except for stray light influences as the radiometer field of view swept near and through the solar disc. Corrective procedures are outlined and their application is undergoing further refinement. These data are appropriate for use in the development of operationally useful predictive models. The radiance data in conjunction with their companion scattering coefficient data, are readily applicable to the determination of slant path contrast transmittances, atmospheric optical depths, aerosol directional scattering characteristics, flux divergences and their attendant determinations of turbid atmospheric single scattering albedos.

Descriptors :   *RADIANCE, SKY BRIGHTNESS, WESTERN EUROPE, SKY, TERRAIN, LIGHT, MEASUREMENT, RADIOMETERS, AIRBORNE, TRANSPORT AIRCRAFT, LEVEL FLIGHT, WEATHER

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE