Physics
Scientific paper
Mar 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jastp..59..537n&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, v. 59, p. 537-560.
Physics
15
Scientific paper
This work is concerned with the numerical modelling of the well known Trimpi effect, in which transient perturbations of amplitude and phase appear in subionospheric VLF transmissions. These perturbations are due to scattering from night-time D region irregularities or LIE's (localised ionisation enhancements), which result from electron density increases due to precipitation from lightning whistlers. A theoretical and numerical technique is developed for modelling the scattering process. The formalism is based on a multi-modal treatment of an assembly of point scatterers, and is subject to the Born weak scattering approximation. The VLF propagation code MODEFNDR is used to determine the total E field incident on each element of the scattering volume. Using the conductivity tensor the effective induced current field in the LIE may be calculated. MODEFNDR is used again to find the total scattered field radiated by the current field induced in the LIE. The technique does not require that the scale length of the LIE is many wavelengths long, and the theory predicts strong intermodal scattering. The model is applied to the paths NWC-Dunedin, Omega(Australia)-Dunedin and NPM, Hawaii-Palmer, Antarctica. The agreement with observations is good.
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