Group delay times of whistler-mode signals from VLF transmitters observed at Faraday, Antarctica

Details Group delay times of whistler-mode signals from VLF transmitters observed at Faraday, Antarctica Group delay times of whistler-mode signals from VLF transmitters observed at Faraday, Antarctica

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54...99s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, Jan. 1992, p. 99-107. Research supported by NERC and S

Physics

Antarctic Regions, Field Aligned Currents, Propagation Modes, Radio Transmitters, Time Lag, Whistler Recorders, Electron Density (Concentration), Magnetic Field Configurations, Military Technology, Very Low Frequencies

Scientific paper

Models of electron density, temperature, and ion composition distribution for typical day and nighttime conditions are used to analyze theoretically, for different L-shells of propagation, the group delay times (tg) of whistler-mode waves generated by the NAA (f = 24.0 kHz) and NSS (f = 21.4 kHz) U.S. Navy transmitters and recorded at Faraday, Antarctica (L = 23), after following a ducted field-aligned path. tg is presented as the sum of a group delay time calculated for the simplest model of wave propagation parallel to the magnetic field in a cold dense plasma with the effects of ions neglected, and the corrections due to finite electron density, i.e., finite ratio of electron plasma frequency to electron gyrofrequency, contribution of ions, and nonzero electron temperature. It is concluded that the dominant effect is due to the finite electron density. The total correction to the group delay time due to these effects lies in the range 7-11 ms depending on the model of electron density and temperature distribution.

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