Ionospheric ELF radio signal generation due to LF and/or MF radio transmissions. I - Experimental results

Physics

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Auroral Zones, Extremely Low Radio Frequencies, Ionospheric Propagation, Low Frequencies, Radio Transmission, Diurnal Variations, Electrojets, Finland, Norway, Radio Communication, Sweden, Very Low Frequencies

Scientific paper

Data obtained in a program of ELF/VLF goniometer recordings in northern Scandinavia are analyzed. The results indicate that six 1-kHz timing signals (pips) received on the hour were produced by a nonlinear demodulation mechanism in the D region of the auroral ionosphere. A positive temporal correlation between ELF pip generation and periods of enhanced local magnetic activity is obtained, demonstrating a close association between the reception of the ELF pips and the auroral electrojet. The pip magnetic field strengths are found to be of the order of 0.1 pT. The originating signals are shown to emanate from one or more Soviet LF and/or MF radio transmitters located at least several hundred km from the favored generation region.

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