Location of lightning-induced electron precipitation from measurement of VLF phase and amplitude perturbations on spaced antennas and on two frequencies

Details Location of lightning-induced electron precipitation from measurement of VLF phase and amplitude perturbations on spaced antennas and on two frequencies Location of lightning-induced electron precipitation from measurement of VLF phase and amplitude perturbations on spaced antennas and on two frequencies

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.4135d&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, April 1, 1990, p. 4135-4145.

Physics

20

Antenna Arrays, Electron Precipitation, Ionospheric Propagation, Lightning, Very Low Frequencies, Electromagnetic Interference, Ionization, Phase Locked Systems, Propagation Modes

Scientific paper

The phase and amplitude perturbations on a VLF subionospheric transmission can always be expressed in terms of a perturbation or echo phasor. It is believed that lightning-induced electron precipitation (LEP) can produce a localized increase in ionization which acts as a scattering center and so echo source for subionospheric VLF waves. The phase of the echo relative to the direct signal will differ on spaced antennas if the angle of arrival of the two signals differ. Similarly, this relative phase will vary with frequency if the group delay of the signals differ. Thus measurement of these differences allows location of the scattering centers and so the LEP. Locations made show a significant grouping in a region where both the lightning intensity is high and the field line passes through the center of the inner radiation belt.

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