STATISTIC OF SEASONAL AND DIURNAL VARIATIONS OF DOPPLER FREQUENCY SHIFT OF HF SIGNALS AT MID-LATITUDE RADIO PATH

STATISTIC OF SEASONAL AND DIURNAL VARIATIONS OF DOPPLER FREQUENCY SHIFT OF HF SIGNALS AT MID-LATITUDE RADIO PATH

PACS number: 94.20.VvPurpose: An experimental study of signatures of traveling ionospheric disturbances (TID) observed in diurnal-seasonal variations of the parameters of probe HF signals propagating on theoblique single-hop RWM–LFO radio path, derived from the yearlong monitoring data.Design/method...

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Дата:2020
Автори: Reznychenko, A. I., Koloskov, A. V., Sopin, A. O., Yampolski, Y. M.
Формат: Стаття
Мова:Russian
Опубліковано: Видавничий дім «Академперіодика» 2020
Теми:
traveling ionospheric disturbances
quasiperiodic variations
Doppler frequency shift
radio path
period
amplitude
probability of detection
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Назва журналу:Radio physics and radio astronomy

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Radio physics and radio astronomy
id rpra-journalorgua-article-1332
record_format ojs
institution Radio physics and radio astronomy
baseUrl_str
datestamp_date 2020-06-09T10:20:32Z
collection OJS
language Russian
topic traveling ionospheric disturbances
quasiperiodic variations
Doppler frequency shift
radio path
period
amplitude
probability of detection
spellingShingle traveling ionospheric disturbances
quasiperiodic variations
Doppler frequency shift
radio path
period
amplitude
probability of detection
Reznychenko, A. I.
Koloskov, A. V.
Sopin, A. O.
Yampolski, Y. M.
STATISTIC OF SEASONAL AND DIURNAL VARIATIONS OF DOPPLER FREQUENCY SHIFT OF HF SIGNALS AT MID-LATITUDE RADIO PATH
topic_facet traveling ionospheric disturbances
quasiperiodic variations
Doppler frequency shift
radio path
period
amplitude
probability of detection
перемещающиеся ионосферные возмущения
квазипериодические вариации
доплеровское смещение частоты
радиолиния
период
амплитуда
вероятность наблюдения
рухомі іоносферні збурення
квазіперіодичні варіації
доплерівське зміщення частоти
радіолінія
період
амплітуда
імовірність спостереження
format Article
author Reznychenko, A. I.
Koloskov, A. V.
Sopin, A. O.
Yampolski, Y. M.
author_facet Reznychenko, A. I.
Koloskov, A. V.
Sopin, A. O.
Yampolski, Y. M.
author_sort Reznychenko, A. I.
title STATISTIC OF SEASONAL AND DIURNAL VARIATIONS OF DOPPLER FREQUENCY SHIFT OF HF SIGNALS AT MID-LATITUDE RADIO PATH
title_short STATISTIC OF SEASONAL AND DIURNAL VARIATIONS OF DOPPLER FREQUENCY SHIFT OF HF SIGNALS AT MID-LATITUDE RADIO PATH
title_full STATISTIC OF SEASONAL AND DIURNAL VARIATIONS OF DOPPLER FREQUENCY SHIFT OF HF SIGNALS AT MID-LATITUDE RADIO PATH
title_fullStr STATISTIC OF SEASONAL AND DIURNAL VARIATIONS OF DOPPLER FREQUENCY SHIFT OF HF SIGNALS AT MID-LATITUDE RADIO PATH
title_full_unstemmed STATISTIC OF SEASONAL AND DIURNAL VARIATIONS OF DOPPLER FREQUENCY SHIFT OF HF SIGNALS AT MID-LATITUDE RADIO PATH
title_sort statistic of seasonal and diurnal variations of doppler frequency shift of hf signals at mid-latitude radio path
title_alt СТАТИСТИКА СЕЗОННЫХ И СУТОЧНЫХ ВАРИАЦИЙ ДОПЛЕРОВСКОГО СМЕЩЕНИЯ ЧАСТОТЫ ВЧ СИГНАЛОВ НА СРЕДНЕШИРОТНОЙ РАДИОТРАССЕ
СТАТИСТИКА СЕЗОННИХ І ДОБОВИХ ВАРІАЦІЙ ДОПЛЕРІВСЬКОГО ЗМІЩЕННЯ ЧАСТОТИ ВЧ СИГНАЛІВ НА СЕРЕДНЬОШИРОТНІЙ РАДІОЛІНІЇ
description PACS number: 94.20.VvPurpose: An experimental study of signatures of traveling ionospheric disturbances (TID) observed in diurnal-seasonal variations of the parameters of probe HF signals propagating on theoblique single-hop RWM–LFO radio path, derived from the yearlong monitoring data.Design/methodology/approach: A long term digital recording of the HF radio signals’ waveforms of the Exact time and frequency service station (RWM, Moscow, Russia) was made at the Low Frequency Observatory of the IRA NAS–Ukraine (LFO, Martove, Kharkіv reg., Ukraine). The Doppler frequency shift (DFS) was derived from the power spectra of the recorded signals. The DFS quasiperiodic variations were interpreted as the result of passage of traveling ionospheric disturbances associated with the acoustic-gravity waves (AGW) at the height of the F-layer of ionosphere. The value of the DFS variation period was determined as the sum of the time intervals between neighboring zero crossing of two consecutive half-periods, and the amplitude was determined as the range of variations. The cases of F region shielding by the underlying ionospheric layers Es and E were taken into account as well.Findings: The data on the periods and amplitudes of the DFS variations were used for statistical analysis. The probability of DFS variations’ observation was determined for each month. This value lies within 81 to 91 % in winter and spring and decreases to within 52 to 80 % in summer and autumn seasons. It is shown that the rise of electron density in the lower layers of the ionosphere Es and E makes it difficult to detect TIDs in the F region. This results in a significant underestimation of the probability of observation in the summer and partially in the spring-autumn seasons. The diurnal-seasonal dependences of the probability of DFS observation, as well as their periods and amplitudes were determined. The forms of daily distributions of both amplitude and period are generally similar for all the seasons. They show two peaks, one in the morning and the second one in the evening, and the minimum in the afternoon. As respects the seasonal distributions of periods and amplitudes, in summer, a higher median value of period and more even distribution of amplitude are observed. In addition, we evaluated the influence of the level of geomagnetic storminess on the characteristics of DFS variations. It was determined that a rise of geomagnetic activity (K-index ≥2) is accompanied by decreasing of the observation probability and increasing of the amplitudes and periods of DFS variations.Conclusions: The techniques developed for the analysis of the data of Doppler ionospheric sounding by non-special type HF signals can be used for diagnostics and analysis of the ionospheric disturbances.Key words: traveling ionospheric disturbances, quasiperiodic variations, Doppler frequency shift, radio path, period, amplitude, probability of detectionManuscript submitted  11.12.2019Radio phys. radio astron. 2020, 25(2): 118-135REFERENCES1. GOSSARD, E. and HOOKE, W., 1978. Waves in the atmosphere. Moscow, Russia: Mir Publ. (in Russian).2. HOOKE, W. H., 1968. Ionospheric irregularities produced by internal atmospheric gravity waves. J. Atmos. Terr. Phys. vol. 30, is. 5, pp. 795–823. DOI: https://doi.org/10.1016/S0021-9169(68)80033-93. NARAYANAN, V. 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publisher Видавничий дім «Академперіодика»
publishDate 2020
url http://rpra-journal.org.ua/index.php/ra/article/view/1332
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spelling rpra-journalorgua-article-13322020-06-09T10:20:32Z STATISTIC OF SEASONAL AND DIURNAL VARIATIONS OF DOPPLER FREQUENCY SHIFT OF HF SIGNALS AT MID-LATITUDE RADIO PATH СТАТИСТИКА СЕЗОННЫХ И СУТОЧНЫХ ВАРИАЦИЙ ДОПЛЕРОВСКОГО СМЕЩЕНИЯ ЧАСТОТЫ ВЧ СИГНАЛОВ НА СРЕДНЕШИРОТНОЙ РАДИОТРАССЕ СТАТИСТИКА СЕЗОННИХ І ДОБОВИХ ВАРІАЦІЙ ДОПЛЕРІВСЬКОГО ЗМІЩЕННЯ ЧАСТОТИ ВЧ СИГНАЛІВ НА СЕРЕДНЬОШИРОТНІЙ РАДІОЛІНІЇ Reznychenko, A. I. Koloskov, A. V. Sopin, A. O. Yampolski, Y. M. traveling ionospheric disturbances; quasiperiodic variations; Doppler frequency shift; radio path; period; amplitude; probability of detection перемещающиеся ионосферные возмущения; квазипериодические вариации; доплеровское смещение частоты; радиолиния; период; амплитуда; вероятность наблюдения рухомі іоносферні збурення; квазіперіодичні варіації; доплерівське зміщення частоти; радіолінія; період; амплітуда; імовірність спостереження PACS number: 94.20.VvPurpose: An experimental study of signatures of traveling ionospheric disturbances (TID) observed in diurnal-seasonal variations of the parameters of probe HF signals propagating on theoblique single-hop RWM–LFO radio path, derived from the yearlong monitoring data.Design/methodology/approach: A long term digital recording of the HF radio signals’ waveforms of the Exact time and frequency service station (RWM, Moscow, Russia) was made at the Low Frequency Observatory of the IRA NAS–Ukraine (LFO, Martove, Kharkіv reg., Ukraine). The Doppler frequency shift (DFS) was derived from the power spectra of the recorded signals. The DFS quasiperiodic variations were interpreted as the result of passage of traveling ionospheric disturbances associated with the acoustic-gravity waves (AGW) at the height of the F-layer of ionosphere. The value of the DFS variation period was determined as the sum of the time intervals between neighboring zero crossing of two consecutive half-periods, and the amplitude was determined as the range of variations. The cases of F region shielding by the underlying ionospheric layers Es and E were taken into account as well.Findings: The data on the periods and amplitudes of the DFS variations were used for statistical analysis. The probability of DFS variations’ observation was determined for each month. This value lies within 81 to 91 % in winter and spring and decreases to within 52 to 80 % in summer and autumn seasons. It is shown that the rise of electron density in the lower layers of the ionosphere Es and E makes it difficult to detect TIDs in the F region. This results in a significant underestimation of the probability of observation in the summer and partially in the spring-autumn seasons. The diurnal-seasonal dependences of the probability of DFS observation, as well as their periods and amplitudes were determined. The forms of daily distributions of both amplitude and period are generally similar for all the seasons. They show two peaks, one in the morning and the second one in the evening, and the minimum in the afternoon. As respects the seasonal distributions of periods and amplitudes, in summer, a higher median value of period and more even distribution of amplitude are observed. In addition, we evaluated the influence of the level of geomagnetic storminess on the characteristics of DFS variations. 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Available from: http://geospace.com.ua/data/metmag_ki.php УДК 537.876.23, 550.388.2Предмет и цель работы: Экспериментальное исследование проявлений перемещающихся ионосферных возмущений (ПИВ) в суточно-сезонных вариациях параметров пробных ВЧ сигналов на наклонной односкачковой радиотрассе РВМ–НЧО, восстановленных по данным полного года мониторинговых наблюдений.Методы и методология: Длительная цифровая регистрация волновых форм ВЧ радиосигналов станции Службы точного времени и частоты (РВМ, Москва, Россия) осуществлялась в Низкочастотной обсерватории Радиоастрономического института НАН Украины (НЧО, с. Мартовое, Харьковская обл.). По энергетическим спектрам принятых сигналов оценивалось доплеровское смещение частоты (ДСЧ). Квазипериодические вариации ДСЧ интерпретировались как результат прохождения ПИВ, ассоциируемых с акустико-гравитационными волнами (АГВ), на высотах F-слоя ионосферы. Значение периода вариаций ДСЧ определялось как сумма интервалов времени между соседними нулями двух следующих друг за другом полупериодов, а под амплитудой понимался размах вариаций. Дополнительно учитывались случаи экранирования области F нижележащими ионосферными слоями Es и E.Результаты: Для статистического анализа использовались данные о периодах и амплитудах вариаций ДСЧ. Определена вероятность наблюдения вариаций ДСЧ для каждого месяца, которая лежит в диапазоне 81÷91% зимой и весной с уменьшением летом и осенью до 52÷80 %. Показано, что рост концентрации электронов в нижних слоях ионосферы Es  и E затрудняет обнаружение ПИВ в F-области. Это приводит к существенному занижению вероятности наблюдения в летний и частично в весенне-осенний сезоны. Определены сезонно-суточные зависимости вероятности наблюдения, периодов и амплитуд вариаций ДСЧ. Формы суточных распределений как амплитуд, так и периодов для всех сезонов в целом сходны. Имеют место максимумы утром и вечером и минимум в послеполуденное время. Что касается сезонных распределений периодов и амплитуд, летом наблюдается более высокое медианное значение периода и более равномерное распределение амплитуды. Дополнительно проведена оценка влияния уровня геомагнитной возмущенности на характеристики вариаций ДСЧ. Выявлено, что с увеличением геомагнитной активности (K-индекс ≥2) происходит уменьшение вероятности наблюдения и рост амплитуд и периодов вариаций ДСЧ.Заключение: Разработанные методики анализа данных доплеровского зондирования ионосферы ВЧ сигналами неспециального типа могут использоваться для диагностики и анализа ионосферных возмущений.Ключевые слова: перемещающиеся ионосферные возмущения, квазипериодические вариации, доплеровское смещение частоты, радиолиния, период, амплитуда, вероятность наблюденияСтатья поступила в редакцию 11.12.2019Radio phys. radio astron. 2020, 25(2): 118-135СПИСОК ЛИТЕРАТУРЫ1. Госсард Э., Хук У. Волны в атмосфере. 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УДК 537.876.23, 550.388.2Предмет і мета роботи: Експериментальне дослідження проявів рухомих іоносферних збурень (РІЗ) у добово-сезонних варіаціях параметрів пробних ВЧ сигналів на похилій односкачковій радіолінії РВМ–НЧО, відновлених за даними повного року моніторингових спостережень.Методи і методологія: Тривала цифрова реєстрація хви- льових форм ВЧ радіосигналів станції Служби точного часу і частоти (РВМ, Москва, Росія) здійснювалася у Низькочастотній обсерваторії Радіоастрономічного інституту НАН України (НЧО, с. Мартове, Харківська обл.). За енергетичними спектрами прийнятих сигналів оцінювалося доплерівське зміщення частоти (ДЗЧ). Квазіперіодичні варіації ДЗЧ інтерпретувалися як результат проходження РІЗ, асоційованих з акустико-гравітаційними хвилями (АГХ) на висотах F-шару іоносфери. Значення періоду варіацій ДЗЧ визначалося як сума інтервалів часу між сусідніми нулями двох слідуючих один за одним напівперіодів, а під амплітудою розумівся розмах варіацій. Додатково враховувалися випадки екранування області F нижчележачими іоносферними шарами Es і E.Результати: Для статистичного аналізу використовувалися дані про періоди і амплітуди квазіперіодичних варіацій ДЗЧ. Визначено імовірність спостереження варіацій ДЗЧ для кожного місяця, яка лежить в діапазоні 81÷91% взимку та навесні зі зменшенням влітку та восени до 52÷80 %. Показано, що зростання концентрації електронів у нижніх шарах іоносфери Es і E ускладнює виявлення РІЗ в F-області. Це призводить до суттєвого заниження імовірності спостереження у літній і частково у весняно-осінній сезони. Визначено сезонно-добові залежності імовірності спостереження, періодів і амплітуд РІЗ. Форми добових розподілів як амплітуд, так і періодів для всіх сезонів у цілому подібні. Мають місце максимуми вранці і ввечері та мінімум після опівдня. Що стосується сезонних розподілів періодів і амплітуд, влітку спостерігається вище медіанне значення періоду та рівномірніший розподіл амплітуди. Додатково виконано оцінку впли- ву рівня геомагнітної збуреності на характеристики варіацій ДЗЧ. Виявлено, що зі збільшенням геомагнітної активності (K-індекс ≥2) відбувається зменшення імовірності спостереження і зростання амплітуд і періодів варіацій ДЗЧ.Висновок: Розроблені методики аналізу даних доплерівського зондування іоносфери ВЧ сигналами неспеціального типу можуть використовуватися для діагностики та аналізу іоносферних збурень.Ключові слова: рухомі іоносферні збурення, квазіперіодичні варіації, доплерівське зміщення частоти, радіолінія, період, амплітуда, імовірність спостереженняСтаття надійшла до редакції 11.12.2019Radio phys. radio astron. 2020, 25(2): 118-135СПИСОК ЛІТЕРАТУРИ1. Госсард Э., Хук У. Волны в атмосфере. Москва: Мир, 1978. 532 с.2. Hooke W. H. Ionospheric irregularities produced by internal atmospheric gravity waves. J. Atmos. Terr. Phys. 1968. Vol. 30, Is. 5. P. 795–823. DOI: 10.1016/S0021-9169(68)80033-93. Narayanan V. 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Видавничий дім «Академперіодика» 2020-05-22 Article Article application/pdf http://rpra-journal.org.ua/index.php/ra/article/view/1332 10.15407/rpra25.02.118 РАДИОФИЗИКА И РАДИОАСТРОНОМИЯ; Vol 25, No 2 (2020); 118 RADIO PHYSICS AND RADIO ASTRONOMY; Vol 25, No 2 (2020); 118 РАДІОФІЗИКА І РАДІОАСТРОНОМІЯ; Vol 25, No 2 (2020); 118 2415-7007 1027-9636 10.15407/rpra25.02 ru http://rpra-journal.org.ua/index.php/ra/article/view/1332/pdf Copyright (c) 2020 RADIO PHYSICS AND RADIO ASTRONOMY

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