Model predictions of subionospheric VLF signal perturbations resulting from localized, electron precipitation-induced ionization enhancement regions

Details Model predictions of subionospheric VLF signal perturbations resulting from localized, electron precipitation-induced ionization enhancement regions Model predictions of subionospheric VLF signal perturbations resulting from localized, electron precipitation-induced ionization enhancement regions

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9113473t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Dec. 1, 1986, p. 13473-13482.

Other

26

Atmospheric Ionization, Electron Precipitation, Ionospheric Conductivity, Ionospheric Propagation, Very Low Frequencies, Amplitudes, Night Sky, Whistlers

Scientific paper

A wave-mode propagation model was used to predict the effect of localized ionization enhancement (IE) regions on nighttime long-path VLF signals from the U.S. Navy navigational transmitters to Antarctic receiving stations. The propagation model considers multiple modes, variable ground conductivity, and mode conversion; IE regions of variable length and distance from the receiver are examined. The calculations show that some signal paths are more sensitive than others to perturbation by IE regions, and that the size of an IE region is less important than its distance from the receiver. For a specified flux, higher-energy electrons produce larger effects than lower-energy electrons; and for a specified energy, larger fluxes produce larger signal changes. The model calculations support the hypothesis that whistlers can induce the precipitation of small localized fluxes of energetic electrons which subsequently perturb the nighttime VLF signals passing through those regions.

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