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Radio Physics and Radio Astronomy

ISSN Druckformat: 2152-274X
ISSN Online: 2152-2758

Archives: Volume 1, 2010 to Volume 3, 2012

Radio Physics and Radio Astronomy

DOI: 10.1615/RadioPhysicsRadioAstronomy.v2.i3.50
pages 229-245

VARIATIONS OF CHARACTERISTICS OF RADIO SIGNALS AT LONGER DECAMETER WAVELENGTHS PROPAGATING ALONG QUASI-VERTICAL PATHS

K. P. Garmash
V. Karazin National University of Kharkov
S. G. Leus
V. Karazin National University of Kharkiv
S. V. Panasenko
V. Karazin National University of Kharkiv
L. F. Chernogor
V. Karazin National University of Kharkov, 4, Svoboda Sq., Kharkov, 61077; A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura St., Kharkov 61085, Ukraine

ABSTRAKT

Observation results are presented on time variations in the Doppler spectra and amplitudes of ionosphere-reflected radio waves at 3.2 and 4.2 MHz. Diurnal behavior shown by these variations during autumnal equinox days is analyzed. Quasiperiodic and aperiodic processes have been detected which can be associated with the motion of the solar terminator and periodic heating of the ionospheric plasma by powerful HF radio emission from the "Sura" heater. Periods and amplitudes of the quasiperiodic processes correspond to those characteristic of the internal gravity waves. Switching the powerful emission on/off was accompanied by amplification of the quasiperiodic processes and increase in electron density. The latter effect is most likely associated with precipitation of high-energy electrons from the magnetosphere at midlatitudes.


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