Oblique chirp sounding of the modified ionosphere. Experiment and simulation |
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| Authors: | A A Ponyatov V P Uryadov V A Ivanov D V Ivanov A G Chernov V V Shumaev Yu N Cherkashin |
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| Institution: | (1) Radiophysical Research Institute, Nizhny Novgorod, Russia;(2) Mary State Technical University, Yoshkar-Ola, Russia;(3) Institute of Terrestrial Magnetism, Ionosphere, and Radiowave Propagation, Troitsk, Russia |
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| Abstract: | We present the results of experimental studies of the influence of artificial ionospheric disturbances on HF signals used
for oblique sounding of the disturbed volume. The measurements have been performed by a chirp ionosonde over the path Yoshkar-Ola-“Sura”-niznhy
Novgorod with length 234 km. We found the 2F2 mode to disappear (attenuation up to 20 dB) when the ionosphere is influenced
by a vertical powerful radiation in the ordinary mode with long (15 min each) heating and pause intervals. Modeling of the
observed effect was carried out. The calculations agree well with experimental data if the traveling ionospheric disturbances
(TID) with vertical and horizontal scales lz∼20 km and lx∼50 km, respectively, and the relative disturbance of the electron density δN∼0.2–0.3 are amplified (generated) during the
ionosphere heating.
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 42, No. 4, pp. 303–313, April 1999. |
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