Multi-station VLF direction-finding measurements in eastern Canada

Details Multi-station VLF direction-finding measurements in eastern Canada Multi-station VLF direction-finding measurements in eastern Canada

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jatp...44..509s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 44, June 1982, p. 509-522. Research supported by the Science and Engineeri

Physics

20

Radio Direction Finders, Radio Transmission, Ray Tracing, Very Low Frequencies, Wave Propagation, Whistlers, Canada, Earth Magnetosphere, Goniometers, Ionospheric Electron Density, Ionospheric Propagation, Propagation Modes, Solar Eclipses

Scientific paper

The directions of propagation, in the earth-ionosphere waveguide, of multicomponent two-hop whistlers recorded on July 10, 1972, by four VLF goniometer receivers in eastern Canada have been determined. Using the bearings of these great circle paths, triangulation of several whistler exit-points has been accomplished. The L-values of the whistler exit-points determined by this method are systematically lower than those expected from their nose frequencies, by approximately 0.6. Various explanations are discussed for this effect. The most satisfactory is that the whistler waves leave through the side of the ducts (in which they had propagated for most of their path through the magnetosphere) at an altitude of a few thousand kilometers, and then are refracted to lower L-values before exiting from the lower ionosphere. The results are consistent with both the duct termination altitude predicted by Bernhardt and Park (1977) for the appropriate conditions and also with the observed upper cut-off frequency of the whistlers.

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