Accession Number:

AD0650107

Title:

LIGHT TRANSPORT IN THE ATMOSPHERE. VOLUME 1: MONTE CARLO STUDIES

Descriptive Note:

Annual rept., 1 Aug 1965-31 Aug 1966

Corporate Author:

RADIATION RESEARCH ASSOCIATES INC FORT WORTH TX

Report Date:

1966-09-01

Pagination or Media Count:

110.0

Abstract:

The Monte Carlo codes LITE-I and LITE-II were used to compute light transmission data for point and plane sources. The results of these calculations showed that there is no correlation between the scattered transmission data for point isotropic and plane parallel sources. The LITE codes were used to analyze experimental data on light transport in the atmosphere. Reasonably good agreement was obtained for those cases where data were available to adequately describe the atmosphere at the time of the experiments. Calculations were performed to determine the angular dependence of the number albedo from thick cumulus clouds for 0.45 light incident at various angles to the cloud. The polar angular distributions of the reflected photons were found to be cosine distributions and the total number albedo was expressed mathematically. Studies were performed to determine the sensitivity of the LITE-I calculated scattered intensities for a point isotropic monochromatic source to changes in the source and receiver altitudes, aerosol number density, aerosol phase function, altitude variation of the aerosol scattering coefficient and the altitude of the bottom of a cloud layer above the source point. It was found for the source-receiver geometry considered in these studies that the LITE calculations were more sensitive to changes in the number density of the aerosol particles than to changes in the shape of the aerosol phase function.

Subject Categories:

  • Atmospheric Physics
  • Optics
  • Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE