Physics
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jastp..60..941l&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 60, Issue 7-9, p. 941-949.
Physics
Scientific paper
The scattering of radio waves from lightning-induced plasmas is investigated. The plasmas are modeled as long, perfectly conducting cylinders with surface density irregularities on a scale much smaller than the total channel length. The theoretical wavelength dependence of the radar reflectivity is compared with experimental results obtained with the MIT C-band and S-band radars. It is found that the theory of rough surface scattering predicts two types of inverse power law wavelength dependence for radar reflectivity. They are 1/λ and 1/λ2, which correspond to density fluctuations of lightning plasmas with a Gaussian type spectrum and a power-law type spectrum, respectively. By contrast, the theory of long, thin conductors predicts a wavelength dependence of λ05 for radar reflectivity. The experimental observations on common lightning targets free of precipitation masking effects show a mean wavelength dependence of 1/λ084. The observed wavelength dependence lies between the predictions of the two theories. It indicates that the wavelength dependence in these observations is bounded by these two theories. We conclude that the proposed theory for fat overdense plasma channels with irregular surfaces and the theory for long, thin overdense channels bracket the observed wavelength dependence.
Dalkir Y. R.
Lee Ming-Chang
Williams Robert E.
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