Abstract
Abstract It is found that quasiperiodic scintillation events (QPS) originating in the ionosphere have a close counterpart in non-ionospheric QP scintillations (QPR and QPA). The presence of QPA, resulting from an interference of radio signals from two satellites, has been known for some time but rarely referred to in publications. The addition of a new type of regular scintillations (QPR) which have an extended ringing structure, modulation envelope and central maximum, makes it necessary to evaluate the quasiperiodic scintillation data carefully. Unlike QPA, the new type of quasiperiodic scintillations can be generated by an interference effect between a ground transmitter and the Doppler-shifted radio transmission from a satellite. A close resemblance between quasiperiodic events recorded from VHF television transmission, reported to be caused by a Fresnel diffraction effect, and QPR events may indicate their common origin. A careful analysis of the different types of the regular fading, presented here, may help workers in this field to distinguish between the trivial and real types of the specific regular scintillation activity.
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