Ducted magnetospheric propagation of signals from the Siple, Antarctica, VLF transmitter

Details Ducted magnetospheric propagation of signals from the Siple, Antarctica, VLF transmitter Ducted magnetospheric propagation of signals from the Siple, Antarctica, VLF transmitter

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.2692c&link_type=abstract

Journal of Geophysical Research, vol. 81, June 1, 1976, p. 2692-2700. Navy-supported research

Physics

1

Antarctic Regions, Earth Magnetosphere, Radio Transmission, Signal Transmission, Very Low Frequencies, Magnetic Disturbances, Plasma Density, Plasmapause, Wave Dispersion, Whistlers

Scientific paper

A study has been made of the conditions under which 2- to 6-kHz VLF signals transmitted from Siple, Antarctica, are observed at the conjugate ground station Roberval, Canada, following ducted propagation through the magnetosphere. Signal observations were most frequent during quieting following magnetic disturbance. A diurnal activity peak was found at dawn, and day side activity levels were generally higher than those at night. Signal travel times were compared to the dispersion properties of whistlers recorded at Siple and Roberval during July-August 1973 and September-November 1974. The signal path equatorial radii were found to be concentrated in the range 3.5-4.5 earth radii, which is centered roughly on the Siple/Roberval field lines. Multipath propagation was frequently observed, but a single path was usually prominent in terms of received amplitude. During relatively quiet conditions the paths were located within the outer plasmasphere; during moderate disturbance they frequently appeared in the region of steep plasmapause density gradients.

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