Physics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jastp..59.2305b&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, v. 59, p. 2305-2311.
Physics
Scientific paper
Results of experiments measuring the effects of a powerful oblique HF radio transmission on the ionosphere are described. In one experiment carried out in 1991 on a longitudinal path in the south-west part of the U.S.A., additional traces were found on vertical sounding (VS) ionograms generated by an ionosonde located near the mid-point of the path. Numerical synthesis of VS ionograms using reasonable ionospheric models produce additional traces showing that they can be formed by a large scale inhomogeneity of electron density that is produced by a powerful HF transmitter. This inhomogeniety appears in a region of the caustic wedge. These extra traces can be caused either by enhanced or depleted electron densities, although the characteristics associated with each is different. The negative (depleted) disturbance, stretched along the interior branch of the caustic, gives a more adequate description of the observed effects.
Bochkarev S. G.
Krasheninnikov I. V.
Sales Gary S.
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