MF and HF propagation characteristics of ionospheric ducts

Details MF and HF propagation characteristics of ionospheric ducts MF and HF propagation characteristics of ionospheric ducts

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jatp...51..759p&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 51, Sept.-Oct. 1989, p. 759-774. Research supported by the

Computer Science

Sound

8

Anisotropic Media, Ducts, High Frequencies, Ionospheric Electron Density, Ionospheric Propagation, Ray Tracing, Geomagnetism, Magnetospheric Electron Density, Plasma Frequencies, Rocket Sounding

Scientific paper

The propagation of MF and HF radio waves along ionospheric ducts is studied in detail by developing a waveguide model of the ducts and determining power levels of ducted echoes. Distributions of returned echo power have been calculated for ducts with various cross-sections and different depletions in electron density. It is found that field aligned ducts with diameters of the order of several kilometers behave as effective waveguides for both direct and conjugate ducting modes. However, the percentage depletion required for guiding is higher than previous calculations using simplified theory. For direct ducting, there is a clear relationship between the total integrated power across a duct and the electron density gradient and propagation frequency.

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