A possible mechanism of the “self-scattering effect” of powerful HF signals in the ionosphere
The paper suggests a possible explanation to the “self-scattering effect” which has been revealed in the experiments on monito- ring the EISCAT heater emissions at three greatly dispersed sites and consisted in synchronous variations in the signal amplitudes and Doppler frequency shifts as observed...
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| Дата: | 2012 |
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| Автори: | , , , |
| Формат: | Стаття |
| Мова: | rus |
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Видавничий дім «Академперіодика»
2012
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| Онлайн доступ: | http://rpra-journal.org.ua/index.php/ra/article/view/40 |
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| Назва журналу: | Radio physics and radio astronomy |
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oai:ri.kharkov.ua:article-402012-11-04T00:12:27Z A possible mechanism of the “self-scattering effect” of powerful HF signals in the ionosphere О возможном механизме "эффекта саморассеяния" мощных ВЧ сигналов в ионосфере Galushko, V. G. Bezrodny, V. G. Koloskov, A. V. Zalizovski, A. V. The paper suggests a possible explanation to the “self-scattering effect” which has been revealed in the experiments on monito- ring the EISCAT heater emissions at three greatly dispersed sites and consisted in synchronous variations in the signal amplitudes and Doppler frequency shifts as observed at all the receiving positions. In particular, numerical simulations have been performed with the use of data from the EISCAT incohe- rent scatter radar which results show that phase path deviations at the upgoing segment of the pump wave trajectory might play the determinative role in producing synchronous variations in the Doppler frequency shifts of the self-scattered signals observed in the experiments. In addition, the characteristics of HF fields scattered in aspect-sensitive directions are determined with allowance for the regular refraction effects in the ionosphere, and a condition for excitation of the ionospheric interlayer duct channel by HF signals aspect-sensitive scattered in a given direction is analyzed. The geometrical optics calculations are made within the Born approximation for an anisotropic power-law model spectrum of random irregularities of the upper ionosphere. It is shown that the suggested mechanism could provide practically identical HF signal scattering characteristics toward all the three receiving sites. О возможном механизме “эффекта саморассеяния” мощных вч сигналов в ионосфере Предложено возможное объяснение “эффекта саморассеяния”, который был обнаружен в экспериментах по наблюдению излучения нагревного стенда EISCAT в трех значительно разнесенных в пространстве пунктах и заключался в синхронных вариациях уровней и доплеровских смещений частоты (ДСЧ) сигналов на всех приемных позициях. В частности, проведено численное моделирование с использованием данных радара некогерентного рассеяния EISCAT и показано, что девиации фазового пути на восходящем участке траектории распространения волны накачки могли играть определяющую роль в возникновении синхронных вариаций ДСЧ саморассеянных сигналов, наблюдавшихся в эксперименте. Кроме того, рассчитаны характеристики рассеяния ВЧ полей в ракурсном направлении с учетом регулярной рефракции в ионосфере и рассмотрено условие запитки межслоевого ионосферного волновода в заданном направлении ракурсно-рассеянными сигналами. Расчеты выполнены методом геометрической оптики в борновском приближении для анизотропной степенной модели спектра случайных неоднородностей верхней ионосферы. Показано, что рассмотренный механизм обеспечивает практически одинаковые характеристики рассеяния сигналов в направлении всех трех приемных пунктов. Видавничий дім «Академперіодика» 2012-11-03 Article Article application/pdf http://rpra-journal.org.ua/index.php/ra/article/view/40 РАДИОФИЗИКА И РАДИОАСТРОНОМИЯ; Vol 17, No 2 (2012); 112 RADIO PHYSICS AND RADIO ASTRONOMY; Vol 17, No 2 (2012); 112 РАДІОФІЗИКА І РАДІОАСТРОНОМІЯ; Vol 17, No 2 (2012); 112 2415-7007 1027-9636 rus http://rpra-journal.org.ua/index.php/ra/article/view/40/315 |
| institution |
Radio physics and radio astronomy |
| collection |
OJS |
| language |
rus |
| format |
Article |
| author |
Galushko, V. G. Bezrodny, V. G. Koloskov, A. V. Zalizovski, A. V. |
| spellingShingle |
Galushko, V. G. Bezrodny, V. G. Koloskov, A. V. Zalizovski, A. V. A possible mechanism of the “self-scattering effect” of powerful HF signals in the ionosphere |
| author_facet |
Galushko, V. G. Bezrodny, V. G. Koloskov, A. V. Zalizovski, A. V. |
| author_sort |
Galushko, V. G. |
| title |
A possible mechanism of the “self-scattering effect” of powerful HF signals in the ionosphere |
| title_short |
A possible mechanism of the “self-scattering effect” of powerful HF signals in the ionosphere |
| title_full |
A possible mechanism of the “self-scattering effect” of powerful HF signals in the ionosphere |
| title_fullStr |
A possible mechanism of the “self-scattering effect” of powerful HF signals in the ionosphere |
| title_full_unstemmed |
A possible mechanism of the “self-scattering effect” of powerful HF signals in the ionosphere |
| title_sort |
possible mechanism of the “self-scattering effect” of powerful hf signals in the ionosphere |
| title_alt |
О возможном механизме "эффекта саморассеяния" мощных ВЧ сигналов в ионосфере |
| description |
The paper suggests a possible explanation to the “self-scattering effect” which has been revealed in the experiments on monito- ring the EISCAT heater emissions at three greatly dispersed sites and consisted in synchronous variations in the signal amplitudes and Doppler frequency shifts as observed at all the receiving positions. In particular, numerical simulations have been performed with the use of data from the EISCAT incohe- rent scatter radar which results show that phase path deviations at the upgoing segment of the pump wave trajectory might play the determinative role in producing synchronous variations in the Doppler frequency shifts of the self-scattered signals observed in the experiments. In addition, the characteristics of HF fields scattered in aspect-sensitive directions are determined with allowance for the regular refraction effects in the ionosphere, and a condition for excitation of the ionospheric interlayer duct channel by HF signals aspect-sensitive scattered in a given direction is analyzed. The geometrical optics calculations are made within the Born approximation for an anisotropic power-law model spectrum of random irregularities of the upper ionosphere. It is shown that the suggested mechanism could provide practically identical HF signal scattering characteristics toward all the three receiving sites. |
| publisher |
Видавничий дім «Академперіодика» |
| publishDate |
2012 |
| url |
http://rpra-journal.org.ua/index.php/ra/article/view/40 |
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2024-05-26T06:33:35Z |
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2024-05-26T06:33:35Z |
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