Accession Number : AD0848288

Title :   Contrast Transmission Data for Clear and Hazy Model Tropical Atmospheres,

Corporate Author : RADIATION RESEARCH ASSOCIATES INC FORT WORTH TX

Personal Author(s) : Wells, Michael B. ; Collins, Dave G. ; Hopper, Francis A.

Report Date : 01 DEC 1968

Pagination or Media Count : 38

Abstract : Monte Carlo data on the scattering of light in both clear and hazy model tropical atmospheres with ground level meteorological ranges of 25 km and 3 km, respectively, were used to compute atmospheric contrast transmission data. The calculated contrast transmission data show the image attenuation effects of the atmosphere between ground level and an airborne observer. Data were computed for both plane parallel and plane isotropic monochromatic light sources incident to the top of each of the model atmospheres. These data can be used to compute contrast reduction by the atmosphere for atmosphere illuminated by sunlight, moonlight, and night light. The atmospheric contrast transmission function for each model atmosphere was computed for seven values of the source zenith angle, seven values of the incident wavelength, six receiver altitudes, four values of the background albedo, and 48 different combinations of the receiver nadir angle and azimuthal angle. Data are presented that show the variation of the atmospheric contrast transmission function with the source zenith angle, source wavelength, receiver altitude, receiver direction, and background albedo. (Author)

Descriptors :   *LIGHT TRANSMISSION), (*ATMOSPHERES, (*VISIBILITY, ATMOSPHERES), TROPICAL REGIONS, ATMOSPHERE MODELS, PHOTOGRAPHIC CONTRAST, OPTICAL IMAGES, MONTE CARLO METHOD, HAZE, ATTENUATION, AIRBORNE, ALTITUDE.

Subject Categories : Atmospheric Physics
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE