Phase and amplitude perturbations on the NWC signal at Dunedin from lightning-induced electron precipitation

Details Phase and amplitude perturbations on the NWC signal at Dunedin from lightning-induced electron precipitation Phase and amplitude perturbations on the NWC signal at Dunedin from lightning-induced electron precipitation

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94..497d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Jan. 1, 1989, p. 497-503. Research supported by the University of Ota

Statistics

22

Auroral Echoes, Electron Precipitation, Lightning, Magnetosphere-Ionosphere Coupling, New Zealand, Perturbation Theory, Propagation Modes, Very Low Frequencies, Whistlers

Scientific paper

Localized ionospheric depressions near the NWC-Dunedin great circle path diffract echoes which interfere with the direct signal at the Dunedin receiver, to produce perturbations in phase and amplitude. The statistics of both of these perturbations and of the echo phasors (echo magnitude and echo phase) which can be deduced from them are studied. From these statistics, it is deduced that echo paths must be frequently more than a wavelength (14 km) longer than the direct path, so that many of the diffracting centers (electron precipitation beams) must be laterally displaced up to 200 km from the direct path. Since echo signals from these must be diffracted through angles of about 10 deg, ionization enhancements produced by electron precipitation must frequently have lateral (cross-path) dimensions of less than 50 km, with some as narrow as 25 km. The largest perturbation magnitudes seem to require ionization enhancements of longitudinal (parallel to path) dimensions of about 300 km. Electron precipitation confined to thin L-shells could produce such enhancements for the NWC-Dunedin path.

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