Accession Number : ADA019269

Title :   Enhancement of Point Source Thermal Radiation under Clouds in a Nonattenuating Medium.

Descriptive Note : Research and development rept.,

Corporate Author : ARMY ELECTRONICS COMMAND FORT MONMOUTH N J

Personal Author(s) : Cantor,Israel

Report Date : OCT 1975

Pagination or Media Count : 48

Abstract : A detailed series of graphs is provided along with accompanying analyses to show cloud overcast effects upon the visible radiation emanating from a point source to a target at the ground. The appendixed graphs apply to the following set of hypothetical conditions: The medium of propagation is a nonattenuating (no scattering or absorbing) atmosphere, The overlying cloud acts as a 100% diffusely reflecting surface, The ground surface is nonrelecting and The target acts as a Lambert-type receiver. Total atmospheric radiation transmission maxima are about 300% of the direct transmission in a nonattenuating atmosphere. This occurs, for example, when a high-altitude source is close to an overcast with the target parallel to the ground and clouds and its horizontal distance is close to ground zero.

Descriptors :   *Clouds, *Thermal radiation, *Surface targets, *Optical detection, Reflection, Visible spectra, Graphics, Target detection, Flat plate models, Earth models, Wave propagation, Cloud cover

Subject Categories : Meteorology
      Optical Detection and Detectors
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE