ELF radio signals produced in the auroral ionosphere by non-linear demodulation of signals from high-power amplitude-modulated transmitters

Rycroft, M.J.; Cannon, P.S.; Turunen, T.. 1981 ELF radio signals produced in the auroral ionosphere by non-linear demodulation of signals from high-power amplitude-modulated transmitters. Advances in Space Research, 1 (2). 449-454. https://doi.org/10.1016/0273-1177(81)90320-3

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Official URL: http://dx.doi.org/10.1016/0273-1177(81)90320-3

Abstract/Summary

ELF and VLF radio signals were recorded in the afternoon to early morning (local time) between 24 March and 4 April 1979, in Northern Scandinavia. Apart from signals of natural origin, timing signals, i.e. six pips of equal duration of 105 ± 8 ms, at 1 kHz ± 0.5 Hz, were observed on the hour UT. Such signals only occur on days of relatively high geomagnetic activity during enhanced auroral electrojet activity. They are believed to be generated by non-linear demodulation (self-detection) of signals from two or more amplitude modulated transmitters in the USSR, operating at 173, 200, 236, 263 and 657 kHz. The simplest explanation for the observations is provided by the three transmitters operating at 173 kHz.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1016/0273-1177(81)90320-3
ISSN:	02731177
Date made live:	15 Aug 2019 07:57 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/524769

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1016/0273-1177(81)90320-3

ISSN:

02731177

Date made live:

15 Aug 2019 07:57 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/524769