Accession Number : AD0674749

Title :   A PHYSICAL MODEL OF CIRRUS 8-13 MU INFRARED RADIANCE.

Descriptive Note : Research Communication no. 66,

Corporate Author : DOUGLAS AIRCRAFT CO INC HUNTINGTON BEACH CALIF ADVANCED RESEARCH LABS

Personal Author(s) : Hall,Freeman F. , Jr

Report Date : JUN 1968

Pagination or Media Count : 30

Abstract : A simplified physical model of cirrus cloud 8-13 micro meter radiance is derived in an attempt to explain measured cloud radiance characteristics. Thermal emission and scattering of irradiance from the earth are considered separately. The scattering diagram for a 50 micro meter radius ice sphere, which is opaque at these wavelengths, is computed from diffraction theory and specular surface reflection. Thermal emission is found to exceed scattered radiance significantly for all zenith angles, and computed radiance values are found to match measured cloud radiance closely. (Author)

Descriptors :   (*CIRRUS CLOUDS, INFRARED RADIATION), SKY BRIGHTNESS, OPTICAL PROPERTIES, PARTICLES, DISTRIBUTION, TEMPERATURE, WATER VAPOR, SCATTERING, ATMOSPHERE MODELS, MATHEMATICAL PREDICTION, APPROXIMATION(MATHEMATICS), EMISSIVITY

Subject Categories : Meteorology
      Infrared Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE