Variations of Radio Wave Characteristics in Low-Frequency Portion of Decameter Wavelengths at Quasi-Vertical Incidence
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...
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| Datum: | 2012 |
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| Hauptverfasser: | , , , |
| Format: | Artikel |
| Sprache: | Russian |
| Veröffentlicht: |
Видавничий дім «Академперіодика»
2012
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| Online Zugang: | http://rpra-journal.org.ua/index.php/ra/article/view/452 |
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| Назва журналу: | Radio physics and radio astronomy |
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Radio physics and radio astronomy| Zusammenfassung: | 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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