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Journal Electromagnetic Waves and Electronic Systems №5 for 2010 г.
Article in number:
Selection of weak spatial ionospheric structures from topside sounding data
Keywords: ionosphere satellite radio sounding electron concentration travelling ionospheric disturbance
Authors:
P.F. Denisenko, A.I. Skazik, M.Yu. Kotov, A.A. Khomyakov
Abstract:
Briefly set out the methodology of detecting weak wave like structures, excited by auroral substorms in the daytime. The initial experimental data to identify the wave structures are obtained by calculating the profiles of electron concentration (N (h) - profiles) from ionograms of topside sounding. They were registered by on-board satellite "Intercosmos-19" at intervals of 16 seconds 2 April 1979 in the time intervals UT = 13h48m40s - 13h53m44s, LT = 12h10m - 13h00m with changes: geographic longitude of 333.9 º to 346.2 º, geomagnetic latitude Φ from 43.6o to 56.2o, the height hs of satellite from 588 km 542 km. The calculations used only extraordinary traces of ionograms. To determine the disturbances of the topside ionosphere we used the electron density N at fixed altitudes. Traveling ionospheric disturbances (TID) are selected against a background of regular variations of ionospheric parameters as a function of geomagnetic latitude in the form of a single harmonic with unknown amplitudes, wavelengths and phases. Altitude dependences of these characteristics TID are determined from 350 km to 500 km in steps of 10 km. TID belong to a class of large-scale structures (wavelengths from 1355 to 1395 km). Their amplitude increases to 390 km, and then waves are damped. Phase relations show that the TID structures transfer energy up.
Pages: 30-33
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