Accession Number : AD0630117

Title :   THE APPARENT DEPENDENCE OF TERRESTRIAL SCINTILLATION INTENSITY UPON ATMOSPHERIC HUMIDITY.

Descriptive Note : Rept. for Sep 63-Mar 65,

Corporate Author : CHEMICAL RESEARCH AND DEVELOPMENT LABS EDGEWOOD ARSENAL MD

Personal Author(s) : Carlon,Hugh R.

Report Date : NOV 1965

Pagination or Media Count : 35

Abstract : Observations indicate a direct relationship between terrestrial scintillation intensity and relative humidity (RH). A developed theory supplementing air-refractive and diffractive treatments attributes this increased modulation intensity to water droplets formed either gradually or instantaneously at 70% RH or higher. Modulation at visible wavelengths is attributed to scattering, while spectral absorption causes far-infrared-wavelength modulation. The report contains limited experimental substantiation of this theory. A comparative discussion of atmosphere opacity at far-infrared wavelengths (10-micron region) under high- and low-humidity conditions is presented. An empirical equation for determination of the 'scintillation intensity index' is presented, with graphical presentations of conclusions. (Author)

Descriptors :   (*SCINTILLATION, INFRARED RADIATION), (*AEROSOLS, SCINTILLATION), (*HUMIDITY, SCINTILLATION), (*ATMOSPHERIC REFRACTION, HUMIDITY), LIGHT TRANSMISSION, ATMOSPHERES, REFRACTIVE INDEX, WATER VAPOR, ABSORPTION

Subject Categories : Atmospheric Physics
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE