Physics
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jatp...52..357d&link_type=abstract
(URSI, Conference on Wave-Induced Particle Precipitation and Wave-Particle Interactions, Dunedin, New Zealand, Feb. 5-11, 1989)
Physics
2
Ionospheric Disturbances, Ionospheric Propagation, Lightning, Very Low Frequencies, Electron Precipitation, Great Circles, Wave Scattering
Scientific paper
Amplitude and phase perturbations on VLF subionospheric transmissions from the NWC-Dunedin transmitter have been studied on MSK frequencies and at spaced receivers, 9 km apart. Most of the Trimpi's received on the NWC to Dunedin path can be best explained if the lightning-induced electron precipitation ionization is sufficiently localized so that it acts as a scattering center for the subionospheric VLF wave from the transmitter. The scattered wave or echo at the receiver which makes the perturbation phasor is termed an 'echo Trimpi'. The phase of the echo in relation to the direct signal will vary on spaced antennas if the angles of arrival of the two signals differ. Likewise, this relative phase will vary with frequency if the group delays of the signals differ. Locations made show a significant grouping in a region of high lightning intensity. This and other features indicate that these echo Trimpis originate from Southern Hemisphere lightning and also explain the high proportion of echo Trimpis on this path.
Adams David C.
Dowden Richard L.
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