Ionospheric ELF radio signal generation due to LF and/or MF radio transmissions. II - Interpretation

Details Ionospheric ELF radio signal generation due to LF and/or MF radio transmissions. II - Interpretation Ionospheric ELF radio signal generation due to LF and/or MF radio transmissions. II - Interpretation

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44..831c&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 44, Oct. 1982, p. 831-841. Research supported by the Science Research Coun

Physics

8

Auroral Zones, Electrojets, Extremely Low Radio Frequencies, Ionospheric Propagation, Low Frequencies, Radio Transmission, D Region, E Region, Electron Density (Concentration), Ionospheric Heating, Radio Communication, Radio Transmitters

Scientific paper

Four possible mechanisms are considered for the generation of the ELF pips reported by Cannon (1982). The mechanisms involve the heating of the auroral D region or lower E region by AM waves from one or more distant Soviet LF and/or MF radio transmitters, leading to modulation of the large electrojet current, which then radiates at 1 kHz. It is shown that the experimental data favor a mechanism entailing periodic in-phase heating of the ionosphere by two or more synchronized transmitters and that the most likely solutions involve transmissions at 173, 263, 281, and 549 kHz. A 0.6-K peak-to-peak sinusoidal electron-temperature variation superimposed on a 2-K temperature rise is predicted for the combined effect of transmitters in Kaliningrad (173 kHz), Moscow (173 and 263 kHz), and Minsk (281 and 549 kHz). The corresponding 1-kHz magnetic field variations on the ground directly below the source are estimated to be 0.09 pT, in good agreement with the experimental ELF pip field strengths.

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