Computer Science – Sound
Scientific paper
Jun 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ge%26ae..27..513v&link_type=abstract
Geomagnetizm i Aeronomiia (ISSN 0016-7940), vol. 27, May-June 1987, p. 513-516. In Russian.
Computer Science
Sound
F Region, Ionospheric Sounding, Radio Signals, Reflected Waves, Signal Fading, Beams (Radiation), Divergence, F 2 Region, Frequency Response, Time Response
Scientific paper
Short-pulse oblique-sounding data are used to investigate the attenuation of upper-beam (UB) radio signals during reflection from the F-region on paths 1500-3800 km long. It is shown that, on paths about 1500 km long, the UB is the dominant beam and can be more intense than the lower beam (LB) when the latter is substantially attenuated. On a path about 3000 km long, the UB, due to strong divergence, can be significantly less intense than the LB and not efficient enough for communications purposes. On paths close to or longer than 3800 km, communications can be achieved via the Pedersen beam or multibeat modes in the absence of LB reflections.
Poddel'Skii N. P.
Vorob'eva L. P.
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