Occurrence properties of ducted whistler-mode signals from the new VLF transmitter at Siple Station, Antarctica

Details Occurrence properties of ducted whistler-mode signals from the new VLF transmitter at Siple Station, Antarctica Occurrence properties of ducted whistler-mode signals from the new VLF transmitter at Siple Station, Antarctica

Sep 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.7051c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Sept. 1, 1983, p. 7051-7057.

Physics

11

Earth Magnetosphere, Radio Transmission, Very Low Frequencies, Whistlers, Annual Variations, Diurnal Variations, Radio Transmitters

Scientific paper

A study is conducted of the occurrence properties of magnetospheric signals from the VLF transmitter at Siple Station, Antarctica (L = 4.3) at the conjugate station of Roberval, Canada, and in the two-hop mode at Siple in 1980. The propagation paths followed by the well defined 2-4 kHz Siple signals had equatorial radii of L = 4-4.75. This region maps at 100 km altitude to a north-south range of approximately + or - 150 km, centered on the latitude of Siple. The east-west range may have been of comparable size. This signal path concentration is attributed to the effects of an injected wave power threshold for fast temporal wave growth in the magnetosphere, in combination with a spatial variation in ionospheric illumination by the transmitter as well as ducted propagation. These data are consistent with the existence of a relatively narrow north-south separation of about 100 km or less between the ionospheric point of wave injection and the duct field lines.

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