Abstract
Evidences are quoted which show that the fading of 150-kc waves is due to random absorption rather than random scattering from the ionosphere. On the basis of this, a statistical theory has been worked out for the relationship between phase and amplitude of a wave which has encountered random absorption on its downward passage. The predicted behaviour shows excellent agreement with experiment and yields a method for the estimation of the collisional frequency at the region where the absorption is taking place. Experimental results pertaining to 150-kc waves at State College are described and discussed. The method has possibilities for supplementing wind-measurement results to provide information regarding the heights of winds.
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