Numerical simulation of LEP Trimpis observed at Poitiers, France, on signals from VLF transmitters

Details Numerical simulation of LEP Trimpis observed at Poitiers, France, on signals from VLF transmitters Numerical simulation of LEP Trimpis observed at Poitiers, France, on signals from VLF transmitters

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jastp..62..207p&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 62, Issue 3, p. 207-224.

Physics

2

Scientific paper

Transient amplitude and phase perturbations on subionospheric VLF signals, known as the Trimpi effect, are caused by the scattering of VLF radiation from localized ionization enhancements in the nighttime D-region. The patches of ionization are due to precipitation from the radiation belts of keV electrons, that is induced by lightning-generated whistlers.This work is concerned with the numerical simulation of such VLF perturbations, termed LEP (lightning-induced electron precipitation) or classic Trimpis. Two different codes are used to compute the VLF propagation in the Earth-ionosphere waveguide in the presence of a D-region inhomogeneity. The first is based on mode theory, and the second on the FDTD (finite-difference time-domain) method. Both codes are two-dimensional and, therefore, relevant only to LEP events lying on the transmitter-receiver great circle path (TRGCP). A method of simulation is proposed to interpret quantitatively VLF amplitude and phase changes in terms of the approximate location and size of the associated ionospheric perturbation along the TRGCP. The method is applied to LEP Trimpis observed at Poitiers (L = 2) on signals from the NAA and GQD transmitters. Results are discussed in the light of the information that may be deduced from the high-resolution analysis of VLF temporal signatures. A sequence of simultaneous LEP Trimpis observed at Poitiers on three widely separated transmission paths is studied; two alternative interpretations are proposed.

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