Physics
Scientific paper
Feb 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.1515d&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Feb. 1, 1989, p. 1515-1519. Research supported by the University of O
Physics
13
Amplitudes, Earth Ionosphere, Electron Precipitation, Propagation Modes, Wave Propagation, Standing Waves, Very Low Frequencies, Wave Dispersion
Scientific paper
As the interference between the first two modes of earth-ionosphere waveguide propagation at the high end of the VLF band increases with distance, amplitude perturbations may be added to the phase perturbations (trimpis) produced by lightning-induced electron precipitation (LEP). This causes an interference pattern along the propagation path by the LEP-induced change in differential phase. The modal effects in this case are estimated using measurements at 22250 and 22350 Hz, during a night of frequent trimpis produced by large-area LEP occurring close to the great circle path with strong modal interference. It is found that modal generation or modification of trimpi amplitude is related to the local gradient of amplitude. It is shown that the modal modification of trimpis produced by small-area LEP off the great circle path is insignificant.
Adams David C.
Dowden Richard L.
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