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- W2033285836 abstract "Abstract Results are presented of a statistical analysis of experimental data on the long range HF transionospheric propagation obtained by using the radio signals emitted by the 1970-34 A satellite, and received at the Florence station, Italy. The satellite emission was generated above the F2 hmax region. The signal, which penetrates the ionosphere and propagates to remote distances, has frequently been received on Earth's surface with low attenuation. Ray-tracing techniques were employed to verify the consistency of the partially-guided low-loss paths. An analysis of the signal amplitude received is presented. An improvement over free-space propagation losses up to 6 dB over ranges of 12,000 km, and up to 8 dB for nearly antipodal satellite passes have been observed, confirming the existence and the importance of guided propagation for long-range communications between satellites and ground terminals, and also for transionospheric links. The role played by horizontal gradients in the ionospheric electron distribution, which are notably present in the sunrise and sunset regions, was investigated. These allow satellite-to-ground long range propagation, as also confirmed by ray-tracing analysis. Experimental observations are presented of the reception occurrence, path-losses and signal amplitude statistics as a function of the geometry of the link and the ionospheric situation; the propagation mechanisms involved are investigated." @default.
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- W2033285836 date "1978-01-01" @default.
- W2033285836 modified "2023-09-25" @default.
- W2033285836 title "HF transionospheric long range propagation from satellite observed at Florence" @default.
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- W2033285836 doi "https://doi.org/10.1016/0032-0633(78)90035-1" @default.
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