Physics – Optics
Scientific paper
Jun 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jatp...57..743u&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 57, no. 7, p. 743-747
Physics
Optics
Conjugate Points, Ducts, Earth Magnetosphere, F Region, Geomagnetism, Propagation Modes, Radio Waves, Transequatorial Propagation, Waveguides, Electron Density (Concentration), Geomagnetic Latitude, Geometrical Optics, Ionograms, Models
Scientific paper
In the geometrical optics approximation, a synthesis oblique ionogram of ionospheric and magnetospheric HF radio wave signals propagating between magnetic conjugate points has been carried out. The magnetospheric HF propagation is considered for a model of the waveguide formed by field-aligned irregularities with depleted electron density. The characteristic peculiarities of the magnetospheric mode have been determined: (1) strong dispersion of the group delay with a frequency at 14-18 MHz, from -1.4 to 0.6 ms/MHz for magnetically conjugate points at geomagnetic latitudes Phi = 30, 40 and 50 deg, respectively, (2) spreading approximately 1-2 ms, and (3) a possibility of propagation between magnetic conjugate points at moderately low geomagnetic latitudes Phi(sub 0) approximately 30-40 deg at frequencies exceeding 1.5 times the maximum usable frequency (MUF) of multi-hop ionospheric propagation.
Ignat'eva Yu. I.
Ryabova N. V.
Ugrinovsky V. A.
Uryadov V. P.
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