Multi-satellite scintillations, spread-F and sporadic-E over Brisbane. II

Physics

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Ionospheric Propagation, Satellite Transmission, Scintillation, Sporadic E Layer, Spread F, Annual Variations, Australia, Diurnal Variations, Ground-Air-Ground Communication, Midlatitude Atmosphere, Navigation Satellites, Spacecraft Communication, Ultrahigh Frequencies

Scientific paper

An analysis of multisatellite and ionosonde data suggests that sporadic-E parameters and sporadic-E critical reflection frequency and maxima of range spread significantly influence diurnal and seasonal changes in southern mid-latitude scintillations. It is found that scintillations are most pronounced in summer nighttime and winter daytime. Daytime scintillations coincide with the peak occurrence of the constant-height type of sporadic-E. Nighttime scintillations correspond to the maxima of range-spread of spread-F and the range spread of the constant-height type of sporadic-E. The observed occurrence of intense sporadic-E in summer daytime corresponds to small scintillation activity. UHF-range scintillations are associated with intense constant-height sporadic-E. This phenomena is most prominent in winter daytime.

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