THE APPARENT DEPENDENCE OF TERRESTRIAL SCINTILLATION INTENSITY UPON ATMOSPHERIC HUMIDITY.
Rept. for Sep 63-Mar 65,
CHEMICAL RESEARCH AND DEVELOPMENT LABS EDGEWOOD ARSENAL MD
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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
- Atmospheric Physics