VLF transmissions observed at anomalously high latitude above the ionosphere in the conjugate hemisphere

Details VLF transmissions observed at anomalously high latitude above the ionosphere in the conjugate hemisphere VLF transmissions observed at anomalously high latitude above the ionosphere in the conjugate hemisphere

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46...11d&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, Jan. 1984, p. 11-19.

Physics

Ionospheric Propagation, Plasmapause, Radio Transmission, Very Low Frequencies, Ariel 3 Satellite, Ariel 4 Satellite, Geomagnetism, Gyrofrequency, Kp Index

Scientific paper

It is shown that whereas the plasmapause can guide both the NAA and GBR signals, the efficiency of this guidance depends on the position of the plasmapause. The plasmapause must be situated sufficiently equatorwards so that half of the equatorial electron gyrofrequency at the plasmapause position is greater than (or approximately equal to) the transmitter signal frequency. Ray tracing calculations in a realistic magnetosphere model suggest that for the 16 kHz GBR signal, the efficiency of guiding falls off when the L-value of the plasmapause is greater than 3.0; the guiding effectively ceases when this L-value exceeds 3.5. Guidance of the plasmapause gives rise to a wave field at a higher latitude than for nonguided propagation. This, it is pointed out, will only occur when the position of the plasmapause after geomagnetic storms is at a sufficiently low L-value. This is consistent with the experimental observations of anomalously high latitude signal reception following strong magnetic storms.

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