Abstract
The apparent reflection coefficients of the ionosphere for high frequency radio waves have been studied using vertical incidence pulse amplitude data obtained at Prince Rupert. The F-layer first-hop reflection coefficient increases in magnitude as the degree of spread F increases. This increase in magnitude can be explained by focusing of the energy scattered from an irregular surface or by propagation of the energy along field-aligned ducts. Revised methods for obtaining calibration constants for ionospheric absorption measurements are required.
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