Other
Scientific paper
May 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9..563t&link_type=abstract
Geophysical Research Letters, vol. 9, May 1982, p. 563-566.
Other
10
Atmospheric Ionization, D Region, Particle Precipitation, Radio Waves, Very Low Frequencies, Wave Propagation, Electron Precipitation, Ionospheric Ion Density, Mathematical Models, Propagation Modes, Two Dimensional Models, Waveguides, Whistlers
Scientific paper
The effect of localized ionospheric perturbations on the propagation of VLF radio waves in the earth-ionosphere waveguide is investigated by means of a two-dimensional mode propagation model, whose calculations are for the case of a 22.3 kHz transmission from Annapolis, Maryland, to Eights Station, Antarctica. Results suggest that two ionization regions, one near the transmitter and another near the receiver, may need to be present at the same time in order to obtain the more than 3 dB amplitude increases observed. It is suggested that the former is due to transmitter-induced electron precipitation, while the latter results from precipitation associated with simultaneously-occurring whistlers. It is also found that small amplitude changes can be obtained under less restrictive ionospheric perturbation conditions.
Carpenter Donald L.
Rosenberg T. J.
Tolstoy A.
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