Physics
Scientific paper
Apr 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jatp...38..399r&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 38, Apr. 1976, p. 399-411.
Physics
3
Atmospheric Scattering, Mesosphere, Plasma-Electromagnetic Interaction, Radio Scattering, Temperature Effects, Turbulence Effects, Atmospheric Turbulence, Incoherent Scattering, Radar Transmission, Statistical Analysis, Ultrahigh Frequencies, Very High Frequencies
Scientific paper
Scattering of radio waves at VHF and UHF frequencies from thermal and nonthermal fluctuations in the mesosphere is considered. The formulation of scattering from a statistically homogeneous and stationary medium is described and extended to the case of a locally homogeneous and locally stationary medium to show that the scattering is affected by fluctuations in the vicinity of the Bragg scale and also by scales larger than the size of the scattering region. A dimensional model is developed for scattering from nonthermal fluctuations induced by interaction of turbulence with the existing electron-density gradients. Numerical results for incoherent scattering from thermal fluctuations are given. Observations of scattering at VHF and UHF frequencies are discussed to show that the scattering at UHF is due to thermal fluctuations, whereas the scattering at VHF is affected by nonthermal fluctuations induced by turbulence.
Bowhill S. A.
Rastogi Pramod K.
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