VLF propagation parameters derived from sferics observations at high southern latitudes

Details VLF propagation parameters derived from sferics observations at high southern latitudes VLF propagation parameters derived from sferics observations at high southern latitudes

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jatp...49...33v&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 49, Jan. 1987, p. 33-41.

Physics

3

Atmospherics, Lightning, Radio Transmission, Sky Waves, Very Low Frequencies, Vlf Emission Recorders, Antarctic Regions, D Region, Thunderstorms

Scientific paper

Sferics are electromagnetic pulses generated by lightning events. Their maximum spectral energy is in the frequency range below 15 kHz. These powerful natural VLF transmitters can be used to determine the propagation characteristics of the atmospheric wave guide between earth and ionospheric D layer along virtually every propagation path. A VLF-sferics-analyzer was operating at the German Antarctic von Neumayer Station from January to June 1983. This analyzer recorded sferics from distant lightning events in the frequency range between 5 and 9 kHz. The method of measurement is described. The data are evaluated, and the propagation characteristics of the atmospheric wave guide are determined as a function of azimuth and season. The result is compared with theoretical calculations. It is shown that the difference between west-to-east and east-to-west propagation is much smaller than theory predicts, indicating that the ionospheric D layer at high southern latitudes behaves less anisotropic with respect to VLF propagation than at mid-latitudes.

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