Variations of Radio Wave Characteristics in Low-Frequency Portion of Decameter Wavelengths at Quasi-Vertical Incidence

K. P. Garmash, S. G. Leus, S. V. Panasenko, L. F. Chernogor

Abstract


Observations of temporal variations in the spectra of Doppler shift in 3.2-MHz and 4.2- MHz radio waves reflected from the ionosphere are presented. The diurnal variation of such observations made around an autumn equinox has been analyzed. Quasi-periodic and aperiodic processes associated with the solar terminator and with ionospheric heating by high-power HF periodic transmissions from the SURA facility have been detected. The periods and amplitudes of quasi-periodic processes agree with the parameters of internal gravity waves. The on/off switching of the high-power transmission is associated with an enhancement of quasi-periodic processes acting in the ionosphere, as well as with an electron density increase. The latter is most likely associated with energetic electron precipitation from the magnetosphere at midlatitudes.

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References


Гармаш К.П. Вариации характеристик радиоволн низкочастотной части декаметрового диапазона на квазивертикальных радиотрассах / К.П. Гармаш, С.Г. Леус, С.В. Панасенко, Л.Ф. Черногор // Радиофизика и радиоастрономия. — 2011. — Т. 16, № 1. — С. 43-62.




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