Abstract
Some results published by the European Broadcasting Union on the transmission of signals at frequencies of about 50 MHz to distances between 1500 and 2000 km have been analyzed in relation to sporadic- Edata obtained near the path midpoints. Statistical relationships between received signal strength and the ionospheric parameters ƒ oE s and ƒ bE s , have been derived. It is shown that for either a smooth horizontally stratified layer, or one containing scattering irregularities, the variation of signal strength with / tf o E s or ƒ bE s is much greater than can be accounted for theoretically by variations of plasma frequency alone. It thus appears necessary to assume that such changes are accompanied by changes in the layer structure or scattering parameters, and the possible nature of these is indicated.
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