Effects of large-scale clouds of ionosphericirregularities on the propagation of high-frequency radiowaves

Details Effects of large-scale clouds of ionosphericirregularities on the propagation of high-frequency radiowaves Effects of large-scale clouds of ionosphericirregularities on the propagation of high-frequency radiowaves

Nov 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998jastp..60.1687a&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 60, Issue 17, p. 1687-1694.

Physics

Scientific paper

We have devised a technique for computing the radio wave scattering usingasymptotic formulas and numerical simulations, allowing for a wide variety of electron densityprofiles of a regular ionosphere. For a model ionosphere containing, against a background ofregular layers, large-scale clouds of ionization with small-scale fine structure, a study is made ofthe effects due to the signal scattering into the skip zone produced by obliquely propagatinghigh-frequency radio waves. By means of a numerical simulation it is shown that, for typical finestructure parameters, the upper boundary of the operating frequency range can be increased by1.5-2 MHz through the scattering by irregularities. The study revealed previously unknownregions where the influence of random irregularities upon the radio wave propagation is enhanceddramatically in consequence of the ray field defocusing in a regular ionosphere. For paths with thehop range close to a limiting range, it is shown that there is a fundamental possibility of thereception zone being extended through the scattering of upper rays.

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