Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 71291 10.12737/stp-102202408 Results of current research Results of current research Results of current research Determination of the vector velocity of artificial ionospheric irregularities based on Doppler measurements by the bi-static scatter method of HF radio signals propagating over long radio paths Determination of the vector velocity of artificial ionospheric irregularities based on Doppler measurements by the bi-static scatter method of HF radio signals propagating over long radio paths https://orcid.org/0000-0003-1727-5310 Борисова Татьяна Дмитриевна Borisova Tatiana Dmitrievna borisova@aari.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 https://orcid.org/0000-0003-1752-3273 Благовещенская Наталья Федоровна Blagoveshchenskaya Nataly Fedorovna nataly@aari.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 https://orcid.org/0000-0001-7299-6546 Калишин Алексей Сергеевич Kalishin Alexey Sergeevich askalishin@aari.ru

кандидат технических наук;

candidate of technical sciences;

 Ковалев Андрей Сергеевич Kovalev Andrey Sergeevich askovalev@aari.ru Арктический и антарктический научно-исследовательский институт г. Санкт-Петербург Россия Arctic and Antarctic Research Institute St. Petersburg Russian Federation Арктический и антарктический научно-исследовательский институт Санкт-Петербург Россия Arctic and Antarctic Research Institute St. Petersburg Russian Federation Арктический и антарктический научно-исследовательский институт Санкт-Петербург Россия Arctic and Antarctic Research Institute St. Petersburg Russian Federation Арктический и антарктический научно-исследовательский институт г. Санкт-Петербург Россия Arctic and Antarctic Research Institute St. Petersburg Russian Federation 25 06 2024 25 06 2024 10 2 74 92 25 10 2023 29 02 2024 https://zh-szf.ru/en/nauka/article/71291/view

During experiments on the modification of the high-latitude ionosphere by high-power HF radio waves of ordinary or extraordinary polarization of the EISCAT/Heating facility (Tromsø, Norway) in 2013, 2016, and 2019, Doppler measurements of diagnostic HF radio signals over long radio paths were carried out by the bistatic scatter method. We studied characteristics of Doppler frequency variations in bistatic scattered radio signals, using the experimental results obtained along radio paths of different lengths (up to ~8500 km) and orientation. We examined numerical dependences of the Doppler frequency variations in a radio signal on the azimuth of the wave vector of a radio wave incident onto an artificially disturbed region, on the bistatic scattering angle, and on the azimuthal direction of irregularity motion in an artificially disturbed region of the ionosphere. From simultaneous measurements of the Doppler frequency fD of the radio signal along two diagnostic radio paths, we numerically estimated the velocity vector of irregularities in the artificially disturbed region of the ionosphere. The total vector velocity of artificial ionospheric irregularities can be calculated from measurements of the Doppler frequency shift along several long diagnostic radio paths after preliminary analysis of experimental observations with the results of trajectory modeling of diagnostic HF radio signals.

During experiments on the modification of the high-latitude ionosphere by high-power HF radio waves of ordinary or extraordinary polarization of the EISCAT/Heating facility (Tromsø, Norway) in 2013, 2016, and 2019, Doppler measurements of diagnostic HF radio signals over long radio paths were carried out by the bistatic scatter method. We studied characteristics of Doppler frequency variations in bistatic scattered radio signals, using the experimental results obtained along radio paths of different lengths (up to ~8500 km) and orientation. We examined numerical dependences of the Doppler frequency variations in a radio signal on the azimuth of the wave vector of a radio wave incident onto an artificially disturbed region, on the bistatic scattering angle, and on the azimuthal direction of irregularity motion in an artificially disturbed region of the ionosphere. From simultaneous measurements of the Doppler frequency fD of the radio signal along two diagnostic radio paths, we numerically estimated the velocity vector of irregularities in the artificially disturbed region of the ionosphere. The total vector velocity of artificial ionospheric irregularities can be calculated from measurements of the Doppler frequency shift along several long diagnostic radio paths after preliminary analysis of experimental observations with the results of trajectory modeling of diagnostic HF radio signals.

 Radio wave propagation small-scale artificial ionospheric irregularities Doppler observations the EISCAT heating facility modeling Radio wave propagation small-scale artificial ionospheric irregularities Doppler observations the EISCAT heating facility modeling The work was financially supported by the Russian Science Foundation (Grant No. 22-17-00020), [https://rscf.ru/project/22-17-00020/] The work was financially supported by the Russian Science Foundation (Grant No. 22-17-00020), [https://rscf.ru/project/22-17-00020/]

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