Physics
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jastp..60.1177r&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 60, Issue 12, p. 1177-1204.
Physics
Scientific paper
Expressions are developed to characterise the scattering of VLF electromagnetic waves from a finite-length ionised column at some height in the Earth-ionosphere waveguide. This formulation has been examined to investigate the perturbations of VLF transmissions caused by scattering from red sprites (very large luminous phenomena observed over thunderstorms). The idea of a correction factor is advanced to move from a previous model using infinitely long columns to one with truncated columns (50-90 km altitude) inside the waveguide. Using a night-time ionosphere model a quantitative comparison is made between experimentally observed and modelled red sprite scattering characteristics. It is found that the conductivity of the sprite columns (spritelets) must be about 10-4 S m-1 to generate the experimentally observed scattered fields. This suggests that the electron density of red sprites can be five orders of magnitude greater than the night-time ambient electron density at some heights.
Dowden Richard L.
Rodger Craig J.
Thomson Neil. R.
Wait James R.
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