Physics
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jatp...43..307w&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 43, Apr. 1981, p. 307-315.
Physics
1
Equatorial Atmosphere, Ionospheric Propagation, Plasma-Electromagnetic Interaction, Radio Transmission, Transequatorial Propagation, Very High Frequencies, Atmospheric Ionization, Bubbles, Energy Dissipation, Mathematical Models, Propagation Modes, Space Plasmas, Waveguides, Whispering Gallery Modes
Scientific paper
Transequatorial radio wave propagation, supported by the nighttime equatorial ionosphere at frequencies exceeding 50 MHz, is explained in terms of a whispering gallery type of guidance along field-aligned discontinuities in ionization density resulting from the post-sunset creation of equatorial plasma bubbles. Each of these bubbles becomes a partially excited multimode leaky dielectric waveguide, for which the power loss may be readily calculated. By considering in detail the coupling of power into and from, and propagation along, an idealized guide it is possible to identify the important parameters which affect this kind of propagation. It is possible to construct a model for idealized structures and calculate the power received on a transequatorial communications path where propagation is via these phenomena.
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