Physics
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46..643f&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, Aug. 1984, p. 643-661.
Physics
1
Ionospheric F-Scatter Propagation, Radio Scattering, Short Wave Radio Transmission, Spread F, Transequatorial Propagation, Very High Frequencies, Backscattering, Focusing, Fresnel Region, Ionospheric Ion Density, Magnetic Equator, Radar Scattering, Transmission Loss
Scientific paper
Numerical application is made of the theory of scattering by long, curved, field-aligned irregularities of ionization density in the F-region developed by Ferguson and Booker (1983). Using an intermediate-scale regime of irregularities with an outer scale equal to the scale height of the F-region and an inner scale equal to the ion gyroradius, combined with a small-scale regime with an outer scale equal to the ionic gyroradius and an inner scale equal to the electron gyroradius, calculations are made corresponding to (1) equatorial spread-F in the VHF and UHF bands, (2) long-range transequatorial propagation of the type observed by Nielson, and (3) short-range transequatorial propagation of the type observed by Cohen and Bowles. The same ionospheric model yields field-strengths of the right order of magnitude in all three cases. The theory also predicts a focusing phenomenon that should be looked for experimentally.
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