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

Clilverd, M.A. ORCID: https://orcid.org/0000-0002-7388-1529; Thomson, N.R.; Smith, A.J.. 1992 Observation of two preferred propagation paths for whistler mode VLF signals received at a non-conjugate location. Journal of Atmospheric and Terrestrial Physics, 54 (7-8). 1075-1079. 10.1016/0021-9169(92)90073-T

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Official URL: https://doi.org/10.1016/0021-9169(92)90073-T

Abstract/Summary

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.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1016/0021-9169(92)90073-T
ISSN:	00219169
Date made live:	16 Nov 2017 11:42 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/518376

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1016/0021-9169(92)90073-T

ISSN:

00219169

Date made live:

16 Nov 2017 11:42 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/518376