Abstract
Observations have indicated that terrestrial scintillation intensity increases with increasing relative humidity. A theory is developed to supplement air refractive and diffractive treatments; the theory attributes this increased modulation intensity to water droplets formed either gradually or instantaneously for relative humidities of about 70% or more. Modulation at the visible wavelengths is attributed to scattering, while far infrared wavelength modulation is thought to be caused by spectral absorption. Limited experimental substantiation is offered. The opacity of the atmosphere at the far infrared wavelengths (10-μ region) under high-humidity conditions, as compared to the lower-humidity case, is discussed. An empirical equation for the determination of the scintillation intensity index is presented, and conclusions are explained through the use of several graphs.
© 1965 Optical Society of America
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