Ionospheric heating by VLF transmitters?

Details Ionospheric heating by VLF transmitters? Ionospheric heating by VLF transmitters?

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54.1051d&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, no. 7-8, July-Aug. 1992, p. 1051-1059.

Physics

5

Ionospheric Heating, Radio Transmitters, Very Low Frequencies, Amplitude Modulation, Electron Precipitation, Radiation Belts

Scientific paper

The precipitation of radiation-belt electrons by Omega Australia onto the great circle path from a 22.3 kHz transmitter is investigated experimentally with attention given to the prompt modulation effect. Assuming that VLF heating is the cause of the effect, the magnitude of the prompt modulation effect is compared to that observed by Inan (1990) and found to be more than 60 times greater. The transmitter signal is replaced by a similar signal generated in the laboratory which generates a prompt modulation effect, and the cause of the effect is analyzed. A cross-modulation analysis shows that a cross modulation of 1 percent between two signals can be generated by odd harmonic distortion as low as 0.5 percent in the amplifier. Sporadic occurrences of the prompt modulation effect are concluded to be related to unusually strong signals and not necessarily to a highly disturbed ionosphere.

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