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PROPAGATION OF CENTIMETER, MILLIMETER, AND SUB-MILLIMETER WAVES IN THE EARTH'S ATMOSPHERE,
ARMY FOREIGN SCIENCE AND TECHNOLOGY CENTER WASHINGTON D C
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The article reviews the present state of knowledge concerning the propagation of microwaves in the earths atmosphere. The effect of water vapor dimers and monomers as well as molecular oxygen are examined as they contribute to the total absorption coefficient. Three forms of the spectral lines are contrasted, namely that proposed by Lorentz, that proposed by Van Vleck and Weiskopf, and the form obtained from a solution of the kinetic equation. Natural atmospheric wave-guides are discussed briefly indicating why it is impractical to use them for communications. Author
APPROVED FOR PUBLIC RELEASE