VHF propagation modes within ionospheric waveguides

Details VHF propagation modes within ionospheric waveguides VHF propagation modes within ionospheric waveguides

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jatp...51..897p&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 51, Nov.-Dec. 1989, p. 897-910. Research supported by the

Physics

Optics

2

Ionospheric Propagation, Transequatorial Propagation, Very High Frequencies, Waveguides, Geomagnetism, Geometrical Optics, Magnetic Field Configurations, Ray Tracing, Refractivity

Scientific paper

VHF ducting is presently modeled in terms of a three-dimensional, elliptical cross-section waveguide aligned along the earth's magnetic field. Rays propagating to the conjugate hemisphere via the duct undergo few reflections at the duct walls, so that the waveguides are not fully excited; significant power is transmitted by modes which are not fully trapped. In some of the models considered, the region of highest power in the conjugate hemisphere is due almost entirely to rays which have undergone some leakage.

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