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THE CRITICAL FREQUENCY OF THE IONOSPHERIC F2-LAYER AS OBTAINED FROM IONOSONDE DATA AND OBSERVATIONS OF SOLAR RADIO BURSTS

Subject and Purpose. Studying the time variations shown by the critical frequencies of the ionospheric F2 layer through comparative analysis of ionosonde data and observations of type III solar radio bursts.Methods and Methodology. In this work, two independent methods have been used for identifying...

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Main Authors:	Stanislavsky, L. O., Bubnov, I. M., Yerin, S. M., Zalizovski, A. V., Lisachenko, V. M.
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Language:	Ukrainian
Published:	Видавничий дім «Академперіодика» 2023
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spellingShingle	Stanislavsky, L. O. Bubnov, I. M. Yerin, S. M. Zalizovski, A. V. Lisachenko, V. M. THE CRITICAL FREQUENCY OF THE IONOSPHERIC F2-LAYER AS OBTAINED FROM IONOSONDE DATA AND OBSERVATIONS OF SOLAR RADIO BURSTS
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format	Article
author	Stanislavsky, L. O. Bubnov, I. M. Yerin, S. M. Zalizovski, A. V. Lisachenko, V. M.
author_facet	Stanislavsky, L. O. Bubnov, I. M. Yerin, S. M. Zalizovski, A. V. Lisachenko, V. M.
author_sort	Stanislavsky, L. O.
title	THE CRITICAL FREQUENCY OF THE IONOSPHERIC F2-LAYER AS OBTAINED FROM IONOSONDE DATA AND OBSERVATIONS OF SOLAR RADIO BURSTS
title_short	THE CRITICAL FREQUENCY OF THE IONOSPHERIC F2-LAYER AS OBTAINED FROM IONOSONDE DATA AND OBSERVATIONS OF SOLAR RADIO BURSTS
title_full	THE CRITICAL FREQUENCY OF THE IONOSPHERIC F2-LAYER AS OBTAINED FROM IONOSONDE DATA AND OBSERVATIONS OF SOLAR RADIO BURSTS
title_fullStr	THE CRITICAL FREQUENCY OF THE IONOSPHERIC F2-LAYER AS OBTAINED FROM IONOSONDE DATA AND OBSERVATIONS OF SOLAR RADIO BURSTS
title_full_unstemmed	THE CRITICAL FREQUENCY OF THE IONOSPHERIC F2-LAYER AS OBTAINED FROM IONOSONDE DATA AND OBSERVATIONS OF SOLAR RADIO BURSTS
title_sort	critical frequency of the ionospheric f2-layer as obtained from ionosonde data and observations of solar radio bursts
title_alt	ДОСЛІДЖЕННЯ КРИТИЧНОЇ ЧАСТОТИ ШАРУ F2 ІОНОСФЕРИ ЗА ДОПОМОГОЮ ДАНИХ ВІД ІОНОЗОНДІВ І ВІД СПОСТЕРЕЖЕНЬ СОНЯЧНИХ РАДІОСПЛЕСКІВ
description	Subject and Purpose. Studying the time variations shown by the critical frequencies of the ionospheric F2 layer through comparative analysis of ionosonde data and observations of type III solar radio bursts.Methods and Methodology. In this work, two independent methods have been used for identifying critical frequencies in the ionosphere, namely that of vertical sounding and observations of type III solar radio bursts near their cut-off frequency in the ionosphere. One of the ionosondes used for vertical sounding was located near Zmiiv (Kharkiv Region), rather close to the UTR-2 radio astronomy observatory where the solar bursts were observed. The radiation from such bursts represented probe signals for transmissive sounding. The solar radiation was received with an element of a low-frequency (1 to 40 MHz) antenna array.Results. On May 22, 2021 variations in the critical frequency f0F2 of the ionospheric F2-layer were followed between 07:00 and 17:00 UT. The value reached a maximum of 5.9 MHz at 07:45 to 08:00 UT and then decreased smoothlyto 4.9 MHz, stayіng there from 15:30 till 16:45 UT. At that time, a storm of type III solar bursts was recorded with the antenna for radio observations at 1…40 MHz, revealing a cut-off effect for the bursts. As has been found,their cut-off frequency can be used for estimating the critical frequency f0F2 in the ionosphere.Conclusions. The comparative analysis of solar burst observations and frequency-and-time measurements with an ionosonde has shown possibilities for evaluating the critical frequency f0F2 in the ionosphere from the data on the cut-off frequency for solar radio-frequency burst radiation.Keywords: ionosphere, F2-layer, ionosonde measurements, radio astronomical observations, solar bursts, cut-off frequencyManuscript submitted 21.11.2021Radio phys. radio astron. 2022, 27(3): 203-212REFERENCES1. Reber, G. and Ellis, G.R.A., 1956. Cosmic radio-frequency radiation near one megacycle. J. Geophys. Res., 61(1), pp. 1-10. DOI: https://doi.org/10.1029/JZ061i001p000012. Reber, G., 1994. Hectometer radio astronomy. J. Roy. Astron. Soc. Can., 88(5), pp. 297-302.3. George, M., Orchiston, W., Slee, B., Wielebinski, R., 2015. The history of early low frequency radio astronomy in Australia. 2: Tasmania. J. Astron. Hist. Her., 18(1), pp. 14-22.4. George, M., Orchiston, W., Wielebinski, R., 2018. The history of early low frequency radio astronomy in Australia. 9: the university of Tasmania's Llanherne (Hobart airport) field station during the 1960s-1980s. J. Astron. Hist. Her., 21(1), pp. 37-64.5. Ellis, G.R.A., 1953. F-region triple splitting. J. Atmos. Terr. Phys., 3, pp. 263-269. DOI:https://doi.org/10.1016/0021-9169(53)90126-36. Ellis, G.R.A., 1972.The Llanherne low frequency radio telescope. Proc. Astron. Soc. Austr., 2(2), pp. 135-137. DOI:https://doi.org/10.1017/S13233580000132427. Erickson, W.C., 1997. The Bruny Island Radio Spectrometer. Publ. Astron. Soc. Aust., 14(3), pp. 78-282. DOI:https://doi.org/10.1071/AS972788. Zalizovsky, A.V. Kashcheev, A.S., Kashcheev, S.B., Koloskov, A.V., Lisachenko, V.N., Paznukhov, V.V., Pikulik, I.I., Sopin, A.A., Yampolsky, Yu.M., 2018. Model of a portable coherent ionosonde. Space Science and Technology, 24(3), pp. 10-22 (in Russian). DOI:https://doi.org/10.15407/knit2018.03.0109. Zhivolup T.G., Panasenko, S.V., Koloskov, O.V., Lisachenko, V.M., 2021. Joint ionosonde studies of variations in the critical frequency of the F2 ionosphere layer over Kharkiv and Troms'o during the autumn equinox under calm and turbulent conditions. Atmos. Phys. Geospace, 2(1), pp. 38-49 (in Ukrainian). DOI:https://doi.org/10.47774/phag.02.01.2021-410. Panasenko, S.V., Zhivolup, T.G., Kotov, D.V., Koloskov, O.V., Lisachenko, V.M., 2020. One-hour ionosonde study of variations in the critical frequency and height of the F2 ionospheric maximum at both ends of the geomagnetic tube. Atmos. Phys. Geospace,1(1), pp. 31-44 (in Ukrainian). DOI:https://doi.org/10.47774/phag.01.01.2020-311. Shkuratov, Y.G., Konovalenko, A.A., Zakharenko, V.V., Stanislavsky, A.A., Bannikova, E.Y., Kaydash, V.G., Stankevich, D.G., Korokhin, V.V., Vavriv, D.M., Galushko, V.G., Yerin, S.N., Bubnov, I.N., Tokarsky, P.L., Ulyanov, O.M., Stepkin, S.V., Lytvynenko, L.N., Yatskiv, Y.S., Videen, G., Zarka, P., Rucker, H.O., 2019. A twofold mission to the moon: Objectives and payloads. Acta Astronaut., 154, pp. 214-226. DOI:https://doi.org/10.1016/j.actaastro.2018.03.03812. Konovalenko, A., Sodin, L., Zakharenko, V., Zarka, P., Ulyanov, O., Sidorchuk, M., Stepkin, S., Tokarsky, P., Melnik, V., Kalinichenko, N., Stanislavsky, A., Koliadin, V., Shepelev, V., Dorovskyy, V., Ryabov, V., Koval, A., Bubnov, I., Yerin, S., Gridin, A., Kulishenko, V., Reznichenko, A., Bortsov, V., Lisachenko, V., Reznik, A., Kvasov, G., Mukha, D., Litvinenko, G., Khristenko, A., Shevchenko, V.V., Shevchenko, V.A., Belov, A., Rudavin, E., Vasylieva, I., Miroshnichenko, A., Vasilenko, N., Olyak, M., Mylostna, K., Skoryk, A., Shevtsova, A., Plakhov, M., Kravtsov, I., Volvach, Y., Lytvinenko, O., Shevchuk, N., Zhouk, I., Bovkun, V., Antonov, Vavriv, D., Vinogradov, V., Kozhin, R., Kravtsov, A., Bulakh, E., Kuzin, A., Vasilyev, A., Brazhenko, A., Vashchishin, R., Pylaev, O., Koshovyy, V., Lozinsky, A., Ivantyshin, O., Rucker, H.O., Panchenko, M., Fischer, G., Lecacheux, A., Denis, L., Coffre, A., Grieβ-meier, J.-M., Tagger, M., Girard, J., Charrier, D., Briand, C., Mann, G., 2016. The modern radio astronomy network in Ukraine: UTR-2, URAN and GURT. Exp. Astron., 42(1), pp. 11-48. DOI:https://doi.org/10.1007/s10686-016-9498-x13. Bubnov, I.M., Konovalenko, O.O., Tokarsky, P.L., Korolev, O.M., Erin, S.M., Stanislavsky, L.O., 2021. Creation and approbation of a low-frequency radio astronomy antenna for studies of objects of the Universe from the Moon's farside. Radio Phys. Radio Astron., 26(3), pp. 197-210 (in Ukrainian). DOI:https://doi.org/10.15407/rpra26.03.19714. Zakharenko, V., Konovalenko, A., Zarka, P., Ulyanov, O., Sidorchuk, M., Stepkin, S., Koliadin, V., Kalinichenko, N., Stanislavsky, A., Dorovskyy, V., Shepelev, V., Bubnov, I., Yerin, S., Melnik, V., Koval, A., Shevchuk, N.S., Vasylieva, I., Mylostna, K., Shevtsova, A., Skoryk, A., Kravtsov, I., Volvach, Y., Plakhov, M., Vasilenko, N., Vasylkivskyi, Y., Vavriv, D., Vinogradov, V., Kozhin, R., Kravtsov, A., Bulakh, E., Kuzin, A., Vasilyev, A., Ryabov, V., Reznichenko, A., Bortsov, V., Lisachenko, V., Kvasov, G., Mukha, D., Litvinenko, G., Brazhenko, A., Vashchishin, R., Pylaev, O., Koshovyy, V., Lozinsky, A., Ivantyshyn, O., Rucker, H.O., Panchenko, M., Fischer, G., Lecacheux, A., Denis, L., Coffre, A., Grießmeier, J.-M., 2016. Digital Receivers for Low-Frequency Radio Telescopes UTR-2, URAN, GURT. J. Astron. Instrum., 5(4), id. 1641010. DOI:https://doi.org/10.1142/S225117171641010515. Stanislavsky, L.A., Bubnov, I.N., Konovalenko, A.A., Tokarsky, P.L., Yerin, S.N., 2021. The first detection of the solar U+III association with an antenna prototype for the future lunar observatory. Res. Astron. Astrophys., 21(8), id. 187. DOI:https://doi.org/10.1088/1674-4527/21/8/18716. Bubnov, I.N., Stanislavsky, L.A., Yerin, S.N., 2021. Simultaneous observations of solar radio bursts with Ukrainian radio telescopes and by Parker Solar Probe during its encounter. In: Proc. 13th Workshop "Solar Infl uences on the Magnetosphere, Ionosphere and Atmosphere" Primorsko, Bulgaria, 13-17 Sept. 2021, pp. 14-19.17. Mann, G., Breitling, F., Vocks, C., Aurass, H., Steinmetz, M., Strassmeier, K.G., Bisi, M.M., Fallows, R.A., Gallagher, P., Kerdraon, A., Mackinnon, A., Magdalenic, J., Rucker, H., Anderson, J., Asgekar, A., Avruch, I.M., Bell, M.E., Bentum, M.J., Bernardi, G., Best, P., Bîrzan, L., Bonafede, A., Broderick, J.W., Brüggen, M., Butcher, H.R., Ciardi, B., Corstanje, A., de Gasperin, F., de Geus, E., Deller, A., Duscha, S., Eislöffel, J., Engels, D., Falcke, H., Fender, R., Ferrari, C., Frieswijk, W., Garrett, M.A., Grießmeier, J., Gunst, A.W., van Haarlem, M., Hassall, T.E., Heald, G., Hessels, J.W.T., Hoeft, M., Hörandel, J., Horneffer, A., Juette, E., Karastergiou, A., Klijn, W.F.A., Kondratiev, V.I., Kramer, M., Kuniyoshi, M., Kuper, G., Maat, P., Markoff, S., McFadden, R., McKay-Bukowski, D., McKean, J.P., Mulcahy, D.D., Munk, H., Nelles, A., Norden, M.J., Orru, E., Paas, H., Pandey-Pommier, M., Pandey, V.N., Pizzo, R., Polatidis, A.G., Rafferty, D., Reich, W., Röttgering, H., Scaife, A.M.M., Schwarz, D.J., Serylak, M., Sluman, J., Smirnov, O., Stappers, B.W., Tagger, M., Tang, Y., Tasse, C., ter Veen, S., Thoudam, S., Toribio, M.C., Vermeulen, R., van Weeren, R.J., Wise, M.W., Wucknitz, O., Yatawatta, S., Zarka, P. and Zensus, J.A., 2018. Tracking of an electron beam through the solar corona with LOFAR. Astron. Astrophys., 611, id.A57, 9 pp. DOI:https://doi.org/10.1051/0004-6361/201629017
publisher	Видавничий дім «Академперіодика»
publishDate	2023
url	http://rpra-journal.org.ua/index.php/ra/article/view/1394
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spelling	oai:ri.kharkov.ua:article-13942023-06-20T14:17:41Z THE CRITICAL FREQUENCY OF THE IONOSPHERIC F2-LAYER AS OBTAINED FROM IONOSONDE DATA AND OBSERVATIONS OF SOLAR RADIO BURSTS ДОСЛІДЖЕННЯ КРИТИЧНОЇ ЧАСТОТИ ШАРУ F2 ІОНОСФЕРИ ЗА ДОПОМОГОЮ ДАНИХ ВІД ІОНОЗОНДІВ І ВІД СПОСТЕРЕЖЕНЬ СОНЯЧНИХ РАДІОСПЛЕСКІВ Stanislavsky, L. O. Bubnov, I. M. Yerin, S. M. Zalizovski, A. V. Lisachenko, V. M. Subject and Purpose. Studying the time variations shown by the critical frequencies of the ionospheric F2 layer through comparative analysis of ionosonde data and observations of type III solar radio bursts.Methods and Methodology. In this work, two independent methods have been used for identifying critical frequencies in the ionosphere, namely that of vertical sounding and observations of type III solar radio bursts near their cut-off frequency in the ionosphere. One of the ionosondes used for vertical sounding was located near Zmiiv (Kharkiv Region), rather close to the UTR-2 radio astronomy observatory where the solar bursts were observed. The radiation from such bursts represented probe signals for transmissive sounding. The solar radiation was received with an element of a low-frequency (1 to 40 MHz) antenna array.Results. On May 22, 2021 variations in the critical frequency f0F2 of the ionospheric F2-layer were followed between 07:00 and 17:00 UT. The value reached a maximum of 5.9 MHz at 07:45 to 08:00 UT and then decreased smoothlyto 4.9 MHz, stayіng there from 15:30 till 16:45 UT. At that time, a storm of type III solar bursts was recorded with the antenna for radio observations at 1…40 MHz, revealing a cut-off effect for the bursts. As has been found,their cut-off frequency can be used for estimating the critical frequency f0F2 in the ionosphere.Conclusions. The comparative analysis of solar burst observations and frequency-and-time measurements with an ionosonde has shown possibilities for evaluating the critical frequency f0F2 in the ionosphere from the data on the cut-off frequency for solar radio-frequency burst radiation.Keywords: ionosphere, F2-layer, ionosonde measurements, radio astronomical observations, solar bursts, cut-off frequencyManuscript submitted 21.11.2021Radio phys. radio astron. 2022, 27(3): 203-212REFERENCES1. Reber, G. and Ellis, G.R.A., 1956. Cosmic radio-frequency radiation near one megacycle. J. Geophys. Res., 61(1), pp. 1-10. DOI: https://doi.org/10.1029/JZ061i001p000012. Reber, G., 1994. Hectometer radio astronomy. J. Roy. Astron. Soc. Can., 88(5), pp. 297-302.3. George, M., Orchiston, W., Slee, B., Wielebinski, R., 2015. The history of early low frequency radio astronomy in Australia. 2: Tasmania. J. Astron. Hist. Her., 18(1), pp. 14-22.4. George, M., Orchiston, W., Wielebinski, R., 2018. The history of early low frequency radio astronomy in Australia. 9: the university of Tasmania's Llanherne (Hobart airport) field station during the 1960s-1980s. J. Astron. Hist. Her., 21(1), pp. 37-64.5. Ellis, G.R.A., 1953. F-region triple splitting. J. Atmos. Terr. Phys., 3, pp. 263-269. DOI:https://doi.org/10.1016/0021-9169(53)90126-36. Ellis, G.R.A., 1972.The Llanherne low frequency radio telescope. Proc. Astron. Soc. Austr., 2(2), pp. 135-137. DOI:https://doi.org/10.1017/S13233580000132427. Erickson, W.C., 1997. The Bruny Island Radio Spectrometer. Publ. Astron. Soc. Aust., 14(3), pp. 78-282. DOI:https://doi.org/10.1071/AS972788. Zalizovsky, A.V. Kashcheev, A.S., Kashcheev, S.B., Koloskov, A.V., Lisachenko, V.N., Paznukhov, V.V., Pikulik, I.I., Sopin, A.A., Yampolsky, Yu.M., 2018. Model of a portable coherent ionosonde. Space Science and Technology, 24(3), pp. 10-22 (in Russian). DOI:https://doi.org/10.15407/knit2018.03.0109. Zhivolup T.G., Panasenko, S.V., Koloskov, O.V., Lisachenko, V.M., 2021. Joint ionosonde studies of variations in the critical frequency of the F2 ionosphere layer over Kharkiv and Troms'o during the autumn equinox under calm and turbulent conditions. Atmos. Phys. Geospace, 2(1), pp. 38-49 (in Ukrainian). DOI:https://doi.org/10.47774/phag.02.01.2021-410. Panasenko, S.V., Zhivolup, T.G., Kotov, D.V., Koloskov, O.V., Lisachenko, V.M., 2020. One-hour ionosonde study of variations in the critical frequency and height of the F2 ionospheric maximum at both ends of the geomagnetic tube. Atmos. Phys. Geospace,1(1), pp. 31-44 (in Ukrainian). DOI:https://doi.org/10.47774/phag.01.01.2020-311. Shkuratov, Y.G., Konovalenko, A.A., Zakharenko, V.V., Stanislavsky, A.A., Bannikova, E.Y., Kaydash, V.G., Stankevich, D.G., Korokhin, V.V., Vavriv, D.M., Galushko, V.G., Yerin, S.N., Bubnov, I.N., Tokarsky, P.L., Ulyanov, O.M., Stepkin, S.V., Lytvynenko, L.N., Yatskiv, Y.S., Videen, G., Zarka, P., Rucker, H.O., 2019. A twofold mission to the moon: Objectives and payloads. Acta Astronaut., 154, pp. 214-226. DOI:https://doi.org/10.1016/j.actaastro.2018.03.03812. Konovalenko, A., Sodin, L., Zakharenko, V., Zarka, P., Ulyanov, O., Sidorchuk, M., Stepkin, S., Tokarsky, P., Melnik, V., Kalinichenko, N., Stanislavsky, A., Koliadin, V., Shepelev, V., Dorovskyy, V., Ryabov, V., Koval, A., Bubnov, I., Yerin, S., Gridin, A., Kulishenko, V., Reznichenko, A., Bortsov, V., Lisachenko, V., Reznik, A., Kvasov, G., Mukha, D., Litvinenko, G., Khristenko, A., Shevchenko, V.V., Shevchenko, V.A., Belov, A., Rudavin, E., Vasylieva, I., Miroshnichenko, A., Vasilenko, N., Olyak, M., Mylostna, K., Skoryk, A., Shevtsova, A., Plakhov, M., Kravtsov, I., Volvach, Y., Lytvinenko, O., Shevchuk, N., Zhouk, I., Bovkun, V., Antonov, Vavriv, D., Vinogradov, V., Kozhin, R., Kravtsov, A., Bulakh, E., Kuzin, A., Vasilyev, A., Brazhenko, A., Vashchishin, R., Pylaev, O., Koshovyy, V., Lozinsky, A., Ivantyshin, O., Rucker, H.O., Panchenko, M., Fischer, G., Lecacheux, A., Denis, L., Coffre, A., Grieβ-meier, J.-M., Tagger, M., Girard, J., Charrier, D., Briand, C., Mann, G., 2016. The modern radio astronomy network in Ukraine: UTR-2, URAN and GURT. Exp. Astron., 42(1), pp. 11-48. DOI:https://doi.org/10.1007/s10686-016-9498-x13. Bubnov, I.M., Konovalenko, O.O., Tokarsky, P.L., Korolev, O.M., Erin, S.M., Stanislavsky, L.O., 2021. Creation and approbation of a low-frequency radio astronomy antenna for studies of objects of the Universe from the Moon's farside. Radio Phys. Radio Astron., 26(3), pp. 197-210 (in Ukrainian). DOI:https://doi.org/10.15407/rpra26.03.19714. Zakharenko, V., Konovalenko, A., Zarka, P., Ulyanov, O., Sidorchuk, M., Stepkin, S., Koliadin, V., Kalinichenko, N., Stanislavsky, A., Dorovskyy, V., Shepelev, V., Bubnov, I., Yerin, S., Melnik, V., Koval, A., Shevchuk, N.S., Vasylieva, I., Mylostna, K., Shevtsova, A., Skoryk, A., Kravtsov, I., Volvach, Y., Plakhov, M., Vasilenko, N., Vasylkivskyi, Y., Vavriv, D., Vinogradov, V., Kozhin, R., Kravtsov, A., Bulakh, E., Kuzin, A., Vasilyev, A., Ryabov, V., Reznichenko, A., Bortsov, V., Lisachenko, V., Kvasov, G., Mukha, D., Litvinenko, G., Brazhenko, A., Vashchishin, R., Pylaev, O., Koshovyy, V., Lozinsky, A., Ivantyshyn, O., Rucker, H.O., Panchenko, M., Fischer, G., Lecacheux, A., Denis, L., Coffre, A., Grießmeier, J.-M., 2016. Digital Receivers for Low-Frequency Radio Telescopes UTR-2, URAN, GURT. J. Astron. Instrum., 5(4), id. 1641010. DOI:https://doi.org/10.1142/S225117171641010515. Stanislavsky, L.A., Bubnov, I.N., Konovalenko, A.A., Tokarsky, P.L., Yerin, S.N., 2021. The first detection of the solar U+III association with an antenna prototype for the future lunar observatory. Res. Astron. Astrophys., 21(8), id. 187. DOI:https://doi.org/10.1088/1674-4527/21/8/18716. Bubnov, I.N., Stanislavsky, L.A., Yerin, S.N., 2021. Simultaneous observations of solar radio bursts with Ukrainian radio telescopes and by Parker Solar Probe during its encounter. In: Proc. 13th Workshop "Solar Infl uences on the Magnetosphere, Ionosphere and Atmosphere" Primorsko, Bulgaria, 13-17 Sept. 2021, pp. 14-19.17. Mann, G., Breitling, F., Vocks, C., Aurass, H., Steinmetz, M., Strassmeier, K.G., Bisi, M.M., Fallows, R.A., Gallagher, P., Kerdraon, A., Mackinnon, A., Magdalenic, J., Rucker, H., Anderson, J., Asgekar, A., Avruch, I.M., Bell, M.E., Bentum, M.J., Bernardi, G., Best, P., Bîrzan, L., Bonafede, A., Broderick, J.W., Brüggen, M., Butcher, H.R., Ciardi, B., Corstanje, A., de Gasperin, F., de Geus, E., Deller, A., Duscha, S., Eislöffel, J., Engels, D., Falcke, H., Fender, R., Ferrari, C., Frieswijk, W., Garrett, M.A., Grießmeier, J., Gunst, A.W., van Haarlem, M., Hassall, T.E., Heald, G., Hessels, J.W.T., Hoeft, M., Hörandel, J., Horneffer, A., Juette, E., Karastergiou, A., Klijn, W.F.A., Kondratiev, V.I., Kramer, M., Kuniyoshi, M., Kuper, G., Maat, P., Markoff, S., McFadden, R., McKay-Bukowski, D., McKean, J.P., Mulcahy, D.D., Munk, H., Nelles, A., Norden, M.J., Orru, E., Paas, H., Pandey-Pommier, M., Pandey, V.N., Pizzo, R., Polatidis, A.G., Rafferty, D., Reich, W., Röttgering, H., Scaife, A.M.M., Schwarz, D.J., Serylak, M., Sluman, J., Smirnov, O., Stappers, B.W., Tagger, M., Tang, Y., Tasse, C., ter Veen, S., Thoudam, S., Toribio, M.C., Vermeulen, R., van Weeren, R.J., Wise, M.W., Wucknitz, O., Yatawatta, S., Zarka, P. and Zensus, J.A., 2018. Tracking of an electron beam through the solar corona with LOFAR. Astron. Astrophys., 611, id.A57, 9 pp. DOI:https://doi.org/10.1051/0004-6361/201629017 Предмет і мета роботи. Дослідження часових варіацій критичної частоти в іоносферному шарі F2 через порівняльний аналіз даних іонозондових вимірювань і спостережень сонячних радіосплесків ІІІ типу.Методи і методологія. У роботі застосовано два незалежні методи визначення критичних частот, а саме вертикальне зондування іоносфери та спостереження низькочастотних сонячних радіосплесків III типу поблизу їньогох іоносферного відсічення. Використовувались дані іонозондів, один із яких розташовано біля м. Зміїв (Харківська область), неподалік обсерваторії УТР-2, де вимірювались радіосплески. Сонячні радіосплески, що відіграють роль сигналів зондування, спостерігалися за допомогою елемента низькочастотної антенної решітки.Результати. 22.05.2021 р. з 07:00 до 17:00 UT критична частота f0F2, досягнувши максимальної величини 5.9 МГц о 07:45...08:00 UT, плавно знижувалася до 4.9 МГц о 15:30...16:45 UT. У той час антеною для радіоспостережень на частотах 1...40 МГц було зафіксовано бурю сонячних сплесків III типу. В радіоастрономічних вимірюваннях виявлено їхнє відсічення в іоносфері. Показано, що за частотою відсічення сплесків можна оцінювати значення критичної частоти іоносфери f0F2.Висновки. Порівняльний аналіз результатів спостережень сонячних радіосплесків і частотно-часових вимірювань за допомогою іонозонда показав можливість оцінювати значення критичної частоти іоносфери f 0F2.Ключові слова: іоносфера, шар F2, іонозондові вимірювання, радіоастрономічні спостереження, сонячні сплески, частота відсіченняСтаття надійшла до редакції 21.11.2021Radio phys. radio astron. 2022, 27(3):203-212БІБЛІОГРАФІЧНИЙ СПИСОК1. Reber G. and Ellis G.R.A. Cosmic radio-frequency radiation near one megacycle. J. Geophys. Res. 1956. Vol. 61, Iss. 1. P. 1—10.2. Reber G. Hectometer radio astronomy. J. Roy. Astron. Soc. Can. 1994. Vol. 88, Iss. 5. P. 297—302.3. George M., Orchiston W., Slee B., Wielebinski R. The history of early low frequency radio astronomy in Australia. 2: Tasmania. J. Astron. Hist. Her. 2015. Vol. 18, Iss.1. P. 14—224. George M., Orchiston W., Wielebinski, R. The history of early low frequency radio astronomy in Australia. 9: the university of Tasmania’s Llanherne (Hobart airport) field station during the 1960s—1980s. J. Astron. Hist. Her. 2018. Vol. 21, Iss. 1. P. 37—64.5. Ellis G.R.A. F-region triple splitting. J. Atmos. Terr. Phys. 1953. Vol. 3. P. 263—269.6. Ellis G.R.A. The Llanherne low frequency radio telescope. Proc. Astron. Soc. Austr. 1972. Vol. 2, Iss. 3. P. 135—137.7. Erickson W.C. The Bruny Island Radio Spectrometer. Publ. Astron. Soc. Aust. 1997. Vol. 14, Iss. 3. P. 278—282.8. Зализовский А.В., Кащеев А.C., Кащеев С.Б., Колосков А.В., Лисаченко В.Н., Пазнухов В.В., Пикулик И.И., Сопин А.А., Ямпольский Ю.М. Макет портативного когерентного ионозонда. Космічна наука і технологія. 2018. T. 24, No 3. С. 10—22.9. Живолуп Т.Г., Панасенко С.В., Колосков О.В., Лисаченко В.М. Спільні іонозондові дослідження варіацій критичної частоти шару F2 іоносфери над Харковом і Тромсьо в період осіннього рівнодення за спокійних і збурених умов. Фізика атмосфери та геокосмосу. 2021. Т 2, No 1. С. 38—49.10. Панасенко С.В., Живолуп, Т.Г. Котов Д.В., Колосков О.В., Лисаченко В.М. Одночасні іонозондові дослідження варіацій критичної частоти і висоти максимуму шару F2 іоносфери на обох кінцях геомагнітної трубки. Фізика атмосфери та геокосмосу. 2020. T. 1, No 1. С. 31—44.11. Shkuratov Y.G., Konovalenko A.A., Zakharenko V.V., Stanislavsky A.A., Bannikova E.Y., Kaydash V.G., Stankevich D.G., Korokhin V.V., Vavriv D.M., Galushko V.G., Yerin S.N., Bubnov I.N., Tokarsky P.L., Ulyanov O.M., Stepkin S.V., Lytvynenko L.N., Yatskiv Y.S., Videen G., Zarka P., Rucker H.O. A twofold mission to the moon: Objectives and payloads. Acta Astronaut. 2019. Vol. 154. P. 214—226.12. Konovalenko A., Sodin L., Zakharenko V., Zarka P., Ulyanov O., Sidorchuk M., Stepkin S., Tokarsky P., Melnik V., Kalinichenko N., Stanislavsky A., Koliadin V., Shepelev V., Dorovskyy V., Ryabov V., Koval A., Bubnov I., Yerin S., Gridin, A. 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Створення та апробація низькочастотної радіоастрономічної антени для досліджень об’єктів Всесвіту зі зворотного боку Місяця. Радіофізика і радіоастрономія. 2021. T 26, No 3. С. 197—210.14. Zakharenko V., Konovalenko A., Zarka P., Ulyanov O., Sidorchuk M., Stepkin, Koliadin V., Kalinichenko N., Stanislavsky A., Dorovskyy V., Shepelev V., Bubnov I., Yerin S., Melnik V., Koval A., Shevchuk N.S., Vasylieva I., Mylostna K., Shevtsova A., Skoryk A., Kravtsov I., Volvach Y., Plakhov M., Vasilenko N., Vasylkivskyi Y., Vavriv D., Vinogradov V., Kozhin R., Kravtsov A., Bulakh E., Kuzin A., Vasilyev A., Ryabov V., Reznichenko A., Bortsov V., Lisachenko V., Kvasov G., Mukha D., Litvinenko G., Brazhenko A., Vashchishin R., Pylaev O., Koshovyy V., Lozinsky A., Ivantyshyn O., Rucker H.O., Panchenko M., Fischer G., Lecacheux A., Denis L., Coffre A., Grießmeier J.-M. Digital Receivers for Low-Frequency Radio Telescopes UTR-2, URAN, GURT. J. Astron. Instrum. 2016. Vol. 5, Iss. 4, id. 1641010.15. Stanislavsky L.A., Bubnov I.N., Konovalenko A.A., Tokarsky P.L., Yerin S.N. The first detection of the solar U+III association with an antenna prototype for the future lunar observatory. Res. Astron. Astrophys. 2021. Vol. 21, Iss. 8, id. 187.16. Bubnov I.N., Stanislavsky L.A., Yerin S.N. Simultaneous observations of solar radio bursts with Ukrainian radiotelescopes and by Parker Solar Probe during its encounter. Proc. 13th Workshop “Solar Influences on the Magnetosphere, Ionosphere and Atmosphere”. Primorsko, Bulgaria, 13—17 Sept. 2021, pp. 14—19.17. 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Tracking of an electron beam through the solar corona with LOFAR. Astron. Astrophys. 2018. Vol. 611, id.A57, 9 pp. Видавничий дім «Академперіодика» 2023-06-15 Article Article application/pdf http://rpra-journal.org.ua/index.php/ra/article/view/1394 10.15407/rpra27.03.203 РАДИОФИЗИКА И РАДИОАСТРОНОМИЯ; Vol 27, No 3 (2022); 203 RADIO PHYSICS AND RADIO ASTRONOMY; Vol 27, No 3 (2022); 203 РАДІОФІЗИКА І РАДІОАСТРОНОМІЯ; Vol 27, No 3 (2022); 203 2415-7007 1027-9636 10.15407/rpra27.03 uk http://rpra-journal.org.ua/index.php/ra/article/view/1394/pdf Copyright (c) 2022 RADIO PHYSICS AND RADIO ASTRONOMY

THE CRITICAL FREQUENCY OF THE IONOSPHERIC F2-LAYER AS OBTAINED FROM IONOSONDE DATA AND OBSERVATIONS OF SOLAR RADIO BURSTS

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