Size and location of lightning-induced ionisation enhancements from measurement of VLF phase and amplitude perturbations on multiple antennas

Details Size and location of lightning-induced ionisation enhancements from measurement of VLF phase and amplitude perturbations on multiple antennas Size and location of lightning-induced ionisation enhancements from measurement of VLF phase and amplitude perturbations on multiple antennas

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jatp...55.1335d&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 55, no. 10, p. 1335-1359.

Physics

22

Amplitude Distribution Analysis, Atmospheric Ionization, Inverse Scattering, Lightning, Phase Deviation, Antenna Arrays, Very Low Frequencies

Scientific paper

Some 70 lightning-induced ionization enhancements (LIEs) were observed with five Trimpi receivers during a single night in July 1991 in New Zealand. These events are used to determine LIE location and size, and to test the applicability of various LIE models. Most of the LIEs were found to occur over the Tasman Sea near the great circle from the VLF transmitter, NWC, to Wellington, generally some 500 to 2000 km from Wellington. About 70 percent of the events observed at Wellington were below detectability at the southern four sites. Of the events observed over the full length of the array, many showed a variation in Trimpi magnitude along the array inconsistent with a Gaussian model of precipitation distribution with latitude. Deep and sharp minima in the diffraction pattern can only be observed if such a minimum should happen to occur on one of the three middle elements of the five-element array, so that the few such minima observed on the night in question may imply that many more occurred that night.

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