Accession Number : AD0668482

Title :   ATMOSPHERIC PATH RADIANCE CALCULATIONS FOR A MODEL ATMOSPHERE,

Corporate Author : RADIATION RESEARCH ASSOCIATES INC FORT WORTH TEX

Personal Author(s) : Collins,Dave G.

Report Date : 13 MAR 1968

Pagination or Media Count : 30

Abstract : The LITE-II Monte Carlo Program was used to calculate background radiances and path radiances as a function of altitude and direction for a model atmosphere illuminated by a broad beam monodirectional-monochromatic light source located at the top of the atmosphere. The model atmosphere has a ground level visibility of 25 km. LITE-II calculations were run for seven monochromatic plane light sources with wavelengths between 0.35 and 0.95 microns and angles of incidence between 0 and 85 degrees. Path radiances were calculated as a function of altitude and direction for each wavelength and incident angle for Lambert type ground reflection surfaces having albedoes that vary from 0 to 0.9. Intensities as a function of altitude and direction that result from light scattered by the ground were calculated for surfaces having Lambert type reflection properties. Data will be presented that show the relative importance of the path radiance and ground reflectance, as a function of both direction and altitude for the various source wavelengths and source zenith angles considered. (Author)

Descriptors :   (*LIGHT TRANSMISSION, *MATHEMATICAL ANALYSIS), (*ATMOSPHERE MODELS, VISIBILITY), MONOCHROMATIC LIGHT, BACKGROUND, MONTE CARLO METHOD, ALTITUDE, ILLUMINATION, SOURCES, REFLECTION, SURFACES, ALBEDO, INTENSITY, SCATTERING, REFLECTIVITY, SKY, OPTICAL PROPERTIES, MEASUREMENT

Subject Categories : Atmospheric Physics
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE