Abstract
Quasi-periodic scintillation of radio-satellite signals has been attributed to a variety of possible causes; these include site effects, diffraction by ionospheric irregularities, and interference between transmissions from two satellites or between a single satellite and ground transmissions. Evidence is presented showing that fading produced by interference effects can readily be distinguished from scintillation of ionospheric origin, one distinct class of which is confirmed by experiment to originate in the ionospheric E-region. The suggested grouping of all quasi-periodic amplitude fluctuations under the broad classification ‘QP Scintillations’ is not satisfactory, and this term should be restricted to fluctuations originating in the ionosphere.
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