Observation of two preferred propagation paths for whistler mode VLF signals received at a non-conjugate location

Details Observation of two preferred propagation paths for whistler mode VLF signals received at a non-conjugate location Observation of two preferred propagation paths for whistler mode VLF signals received at a non-conjugate location

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54.1075c&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, no. 7-8, July-Aug. 1992, p. 1075-1079. Research suppor

Physics

11

Ionospheric Propagation, Very Low Frequencies, Whistlers, Annual Variations, Ionospheric Electron Density

Scientific paper

Whistler mode signals from NLK (24.8 kHz) were received at Dunedin, New Zealand during 1989-90. The arrival bearing of the signals shows a bimodal distribution which is consistent with the results of ALLCOCK and MCNEILL (1966), who suggested the existence of two paths with less total transmission loss than other paths. PATH 1 signals (which have a duct entry region just south of Dunedin's conjugate) are observed at all times of the year, while PATH 2 signals (which have a duct entry region just south of the NLK transmitter) show an annual variation in occurrence with a maximum in May and a minimum in November which may be a consequence of horizontal ionospheric electron density gradients near the duct entry region. Similarly preferred paths have been observed at Faraday, Antarctica from the NSS transmitter.

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