The application of the WKB approximation to the calculation of the scattering of radio waves from overdense meteor trains

Details The application of the WKB approximation to the calculation of the scattering of radio waves from overdense meteor trains The application of the WKB approximation to the calculation of the scattering of radio waves from overdense meteor trains

Nov 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992p%26ss...40.1487j&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 40, no. 11, p. 1487-1497.

Computer Science

3

Cylindrical Plasmas, Meteoroid Showers, Radio Waves, Wave Scattering, Wentzel-Kramer-Brillouin Method, Cylindrical Waves, Electromagnetic Fields, Hankel Functions

Scientific paper

The possibility of describing the scattering of radio waves at normal incidence from intense meteor trains by a short wavelength approximation is investigated. The electromagnetic fields are expanded in cylindrical waves and the Wentzel-Kramers-Brillouin (WKB) approximation is applied to the individual differential equations for the partial waves. The results are confirmed by applying the phase integral method to ingoing and outgoing cylindrical waves as described by Hankel functions in the Debye-Watson representation. The use of WKB or phase integral method is illustrated by calculating the magnitude of the reflection coefficient for initial line densities of 10 exp 15, 10 exp 16, and 10 exp 17 per m. The results obtained are compared with the predictions of the metallic cylinder model (MCM), the only model available for the estimation of echo durations from overdense trains. This model is found to be reasonable for backscatter, but in general gives poor results when applied to forward scatter.

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