Accession Number : AD0688265

Title :   DIRECTIONAL REFLECTANCE OF ATMOSPHERIC PATHS OF SIGHT,

Corporate Author : DUNTLEY (S Q) LA JOLLA CALIF

Personal Author(s) : Duntley,Seibert Q.

Report Date : MAY 1969

Pagination or Media Count : 19

Abstract : The contrast reducing properties of any path of sight inclined downward through the atmosphere can be specified by a single dimensionless number analogous to a reflectance and called the directional reflectance of the path of sight R*. The contrast transmittance of the path depends solely upon the ratio of the directional path reflectance to the inherent directional reflectance of the background. Previously published optical atmospheric data derived from in-flight measurements have been used to produce tables of R* for two clear-weather conditions. A simple nomograph and numerical examples are included.

Descriptors :   (*LIGHT TRANSMISSION, *ATMOSPHERES), REFLECTION, VISIBILITY, BACKGROUND, AZIMUTH, ILLUMINATION, SUN, NOMOGRAPHS

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE