Solnechno-Zemnaya Fizika Solnechno-Zemnaya Fizika Солнечно-земная физика 2712-9640 39666 10.12737/szf-71202101 Результаты исследований Results of current research Результаты исследований Microwave indicator of potential geoeffectiveness and magnetic flux-rope structure of a solar active region Микроволновый индикатор потенциальной геоэффективности и жгутовая магнитная структура солнечной активной области Кудрявцева Анастасия Витальевна Kudriavtseva Anastasiia Vitalyevna kudryavtseva@iszf.irk.ru https://orcid.org/0000-0002-8530-7030 Мышьяков Иван Иванович Myshyakov Ivan Ivanovich ivan_m@iszf.irk.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 https://orcid.org/0000-0002-0273-138X Уралов Аркадий Михайлович Uralov Arkadiy Mihailovich uralov@iszf.irk.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 https://orcid.org/0000-0001-5308-6336 Гречнев Виктор Васильевич Grechnev Victor Vasil'evich grechnev@iszf.irk.ru

доктор физико-математических наук;

doctor of physical and mathematical sciences;

 Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar-Terrestrial Physics SB RAS Irkutsk Russian Federation Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar-Terrestrial Physics SB RAS Irkutsk Russian Federation Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar-Terrestrial Physics SB RAS Irkutsk Russian Federation Институт солнечно-земной физики СО РАН Иркутск Россия Institute of Solar-Terrestrial Physics SB RAS Irkutsk Russian Federation 7 1 3 12 01 10 2020 11 11 2020 https://naukaru.ru/en/nauka/article/39666/view

Выполнен анализ присутствия микроволнового источника над нейтральной линией (ИНЛ) в суперактивной области NOAA 12673, породившей ряд геоэффективных событий в сентябре 2017 г. Для оценки положения ИНЛ использовались данные Сибирского радиогелиографа в диапазоне 4‒8 ГГц и Радиогелиографа Нобеяма на частоте 17 ГГц. Расчет коронального магнитного поля в нелинейном бессиловом приближении выявил протяженную структуру, состоящую из взаимосвязанных магнитных жгутов, расположенных практически по всей длине главной линии раздела полярностей фотосферного магнитного поля. ИНЛ проецируется в зону максимальных значений горизонтального магнитного поля — основной энергосо-держащей части этой структуры. В ходе каждой вспышки балла X активная область теряла магнитную спиральность и становилась источником КВМ.

We analyze the presence of a microwave neutral-line-associated source (NLS) in a super-active region NOAA 12673, which produced a number of geo-effective events in September 2017. To estimate the NLS position, we use data from the Siberian Radioheliograph in a range 4–8 GHz and from the Nobeyama Radioheliograph at 17 GHz. Calculation of the coronal magnetic field in a non-linear force-free approximation has revealed an extended structure consisting of interconnected magnetic flux ropes, located practically along the entire length of the main polarity separation line of the photospheric magnetic field. NLS is projected into the region of the strongest horizontal magnetic field, where the main energy of this structure is concentrated. During each X-class flare, the active region lost magnetic helicity and became a CME source.

 солнечные активные области магнитные поля микроволновое излучение прогноз солнечных вспышек solar active regions magnetic fields microwave emission solar flare forecast Исследование выполнено за счет гранта Российского научного фонда (проект № 18-12-00172). Методы совместного анализа данных разных инструментов и восстановления магнитного поля разработаны в рамках базового финансирования программы ФНИ II.16. The study was funded by the Russian Science Foundation (project No. 18-12-00172). Methods for joint analysis of data from different instruments and for magnetic field reconstruction were developed with budgetary funding of Basic Research program II.16.

Абрамов-Максимов В.Е., Боровик В.Н., Опейкина Л.В., Тлатов А.Г. Эволюция активной области Солнца 12673 по данным РАТАН-600 и SDO // Труды XXII Всероссийской ежегодной конференции по физике Солнца «Солнечная и солнечно-земная физика - 2018». СПб., 2018. С. 15-18. DOI: 10.31725/0552-5829-2018-15-18. Abramov-Maximov V.E., Borovik V.N., Opeikina L.V., Tlatov A.G. Dynamics of microwave sources associated with the neutral line and the magnetic-field parameters of sunspots as a factor in predicting large flares. Solar Phys. 2015, vol. 290, iss. 1, pp. 53-77. DOI: 10.1007/s11207-014-0605-8. Алтынцев А.Т., Лесовой С.В., Глоба М.В. и др. Многоволновый Сибирский радиогелиограф // Солнечно-земная физика. 2020. Т. 6, № 2. С. 37-50. DOI: 10.12737/szf-62202003. Abramov-Maximov V.E., Borovik V.N., Opeikina L.V., Tlatov A.G. Evolution of solar active region 12673 by RATAN-600 and SDO data. Trudy XXII Vserossiiskoi ezhegodnoi konferentsii po fizike Solntsa “Solnechnaya i solnechno-zemnaya fizika” [Proc. XXII All-Russian Annual Conference on Solar Physics “Solar and Solar-Terrestrial Physics”]. Russia, St. Petersburg, 2018, pp. 15-18. DOI: 10.31725/0552-5829-2018-15-18. (In Russian). Богод В.М., Кальтман Т.И., Яснов Л.В. О свойствах микроволновых источников, расположенных над нейтральной линией радиального магнитного поля // Астрофизический бюллетень. 2012. Т. 67, № 4. С. 441-454. Akhmedov S.B., Borovik V.N., Gelfreikh G.B., Bogod V.M., Korzhavin A.N., Petrov Z.E., Dikij V.N., Lang K.R., Willson R.F. Structure of a solar active region from RATAN 600 and Very Large Array observations. Astrophys. J. 1986, vol. 301, pp. 460-464. Боровик В.Н., Абрамов-Максимов В.Е., Тлатов А.Г. и др. Признаки подготовки мощных вспышек на Солнце в сентябре 2017 г. в микроволновом излучении и структуре магнитного поля активной области по данным РАТАН-600 и SDO/HMI // Изв. Крымской астрофиз. обс. 2018. Т. 114, № 1. С. 8994. Altyntsev A.T., Lesovoi S.V., Globa M.V., Gubin A.V., Kochanov A.A., Grechnev V.V., Ivanov E.F., Kobets V.S., Meshalkina N.S., Muratov A.A., Prosovetsky D.V., Myshyakov I.I., Uralov A.M., Fedotova A.Yu. Multiwave Siberian Radioheliograph. Solar-Terr. Phys. 2020, vol. 6, iss. 2, pp. 30-40. DOI: 10.12737/stp-62202003. Ватрушин С.М., Коржавин А.Н. Труды VI семинара «Физика солнечной плазмы». М.: Наука, 1989. С. 100. Anfinogentov S.A., Stupishin A.G., Mysh’yakov I.I., Fleishman G.D. Record-breaking coronal magnetic field in solar active region 12673. Astrophys. J. Lett. 2019, vol. 880, iss. 2, L29, 5 p. DOI: 10.3847/2041-8213/ab3042. Гельфрейх Г.В. Проблема поиска токовых слоев в солнечной атмосфере радиоастрономическими методами // Физика солнечных вспышек / Под ред. В.В. Фомичева. М.: Наука, 1985. С. 111117. Bakunina I.A., Abramov-Maximov V.E., Osharin A.M. Evolution of the compact microwave inter-sunspot source before strong flare. J. Physics: Conf. Series. 2017, vol. 798, iss. 1, 012041. DOI: 10.1088/1742-6596/798/1/012041. Кинёнес Х.А., Коржавин А.Н., Петерова Н.Г., Сантос Х. Наблюдения солнечного затмения 7 марта 1970 г. на поляриметре Гаванской радиоастрономической станции на волне 4.5 см // Солнечные данные. 1975. № 3. C. 87-96. Bogod V.M., Kaltman T.I., Yasnov L.V. On properties of microwave sources located above the neutral line of radial magnetic field. Astrophys. Bull. 2012, vol. 67, iss. 4, pp. 42-437. DOI: 10.1134/S1990341312040062. Лесовой С.В., Алтынцев А.Т., Кочанов А.А. и др. Сибирский радиогелиограф: первые результаты // Солнечно-земная физика. 2017. Т. 3, № 1. С. 3-16. DOI: 10.12737/24347. Borovik V.N., Vatrushin S.M., Korzhavin A.N. Radio characteristics of the active region connected with the proton flare of April 24, 1985 based on observations with RATAN-600. Bull. Spec. Astrophys. Obs. 1989, vol. 28, pp. 123-131. Руденко И.Г., Руденко Г.В., Уралов А.М. Радиоисточник над нейтральной линией в активных областях, производящих вспышки балла X большой продолжительности // Труды Всероссийской конференции «Многоволновые исследования Солнца и современные проблемы солнечной активности». САО РАН, СПб., 2007. С. 462-474. Borovik V.N., Abramov-Maximov V.E., Tlatov A.G., Opeikina L.V., Shramko A.D., Yasnov L.V. Signs of preparing powerful solar flares in September 2017 in microwave emission and magnetic field structure of active region from RATAN-600 and SDO/HMI data. Izuestiya Krymskoi astrofiz. obs. [Bull. of the Crimean Astrophys. Observatory]. 2018. vol. 114, no. 1. pp. 8994. (In Russian). Уралов А.М., Сыч Р.А., Лубышев Б.И. и др. Микроволновый источник над нейтральной линией как фактор прогноза крупных рентгеновских вспышек // Исследования по геомагнетизму, аэрономии и физике Солнца. Новосибирск: Наука, 1996. Вып. 104. С. 2348. Chiuderi Drago F., Alissandrakis C.E., Hagyard M. Microwave emission above steady and moving sunspots. Solar Phys. 1987, vol. 112, pp. 89-105. DOI: 10.1007/BF00148490. Уралов А.М., Руденко Г.В., Руденко И.Г. Микроволновые источники над нейтральной линией: рождение, связь со вспышками и проекционный эффект // Известия Российской академии наук. Серия физическая. 2006. Т. 70, № 10. C. 1475-1477. Gelfreikh G.B. The problem of search for current sheets in the solar atmosphere with radio astronomical methods. Fizika solnechnykh vspyshek [The physics of the solar flares]. Moscow. Nauka Publ., 1985, pr. 111117. (In Russian). Уралов А.М., Руденко Г.В., Гречнев В.В. и др. Микроволновый источник над нейтральной линией - источник под токовым слоем // Труды Всероссийской конференции «Многоволновые исследования Солнца и современные проблемы солнечной активности». СПб., 2007. С. 484-513. Grechnev V.V., Lesovoi S.V., Smolkov G.Ya., Krissinel B.B., Zandanov V.G., Altyntsev A.T., et al. The Siberian Solar Radio Telescope: the current state of the instrument, observations, and data. Solar Phys. 2003, vol. 216, iss. 1-2, pp. 239-272. DOI: 10.1023/A:1026153410061. Abramov-Maximov V.E., Borovik V.N., Opeikina L.V., Tlatov A.G. Dynamics of microwave sources associated with the neutral line and the magnetic-field parameters of sunspots as a factor in predicting large flares // Solar Phys. 2015. Vol. 290, iss. 1. P. 53-77. DOI: 10.1007/s11207-014-0605-8. Grechnev V.V., Uralov A.M., Zandanov V.G., Baranov N.Y., Shibasaki K. Observations of prominence eruptions with two radioheliographs, SSRT and NoRH. Publ. Astron. Soc. Japan. 2006, vol. 58, pp. 69-84. DOI: 10.1093/pasj/58.1.69. Akhmedov S.B., Borovik V.N., Gelfreikh G.B., et al. Structure of a solar active region from RATAN-600 and Very Large Array observations // Astrophys. J. 1986. Vol. 301. P. 460-464. Hou Y.J., Zhang J., Li T.,Yang S.H., Li X.H. Eruption of a multi-flux-rope system in solar active region 12673 leading to the two largest flares in solar cycle 24. Astron. Astrophys. 2018, vol. 619, A100. DOI: 10.1051/0004-6361/201732530. Anfinogentov S.A., Stupishin A.G., Mysh'yakov I.I., Fleishman G.D. Record-breaking coronal magnetic field in solar active region 12673 // Astrophys. J. Lett. 2019. Vol. 880, iss. 2, L29. 5 p. DOI: 10.3847/2041-8213/ab3042. Inoue S., Shiota D., Bamba Y., Park S.-H. Magnetohydrodynamic modeling of a solar eruption associated with an X9.3 flare observed in the active region 12673. Astrophys. J. 2018, vol. 867, iss. 1, 83. DOI: 10.3847/1538-4357/aae079. Bakunina I.A., Abramov-Maximov V.E., Osharin A.M. Evolution of the compact microwave inter-sunspot source before strong flare // J. Phys.: Conference Ser. 2017. Vol. 798, iss. 1, 012041. DOI: 10.1088/1742-6596/798/1/012041. Kundu M.R., Alissandrakis C.E. Structure and polarization of active region microwave emission. Solar Phys. 1984, vol. 94, iss. 2, pp. 249-283. DOI: 10.1007/BF00151317. Borovik V.N., Vatrushin S.M., Korzhavin A.N. Radio characteristics of the active region connected with the proton flare of April 24, 1985 based on observations with RATAN-600 // Bull. Spec. Astrophys. Obs. 1989. Vol. 28. P. 123-131. Kundu M.R., Velusamy T. Observation with the VLA of a stationary loop structure on the Sun at 6 centimeter wavelength. Astrophys. J. Lett. 1980, vol. 240, pp. L63-L67. DOI: 10.1086/183324. Chiuderi Drago F., Alissandrakis C.E., Hagyard M. Microwave emission above steady and moving sunspots // Solar Phys. 1987. Vol. 112. P. 89-105. DOI: 10.1007/BF00148490. Kundu M.R., Alissandrakis C.E., Bregman J.D., Hin A.C. 6 centimeter observations of solar active regions with 6" resolution. Astrophys. J. 1977, vol. 213, pp. 278-295. DOI: 10.1086/155155. Grechnev V.V., Lesovoi S.V., Smolkov G.Ya., et al. The Siberian Solar Radio Telescope: the current state of the instrument, observations, and data // Solar Phys. 2003. Vol. 216, iss. 1-2. P. 239-272. DOI: 10.1023/A:1026153410061. Kundu M.R., Schmahl E.J., Rao A.P. VLA observations of solar active regions at 6 cm wavelength. Astron. Astrophys. 1981, vol. 94, no. 1, pp. 72-79. Grechnev V.V., Uralov A.M., Zandanov V.G., et al. Observations of prominence eruptions with two radioheliographs, SSRT and NoRH // Publ. Astron. Soc. Japan. 2006. Vol. 58. P. 69-84. DOI: 10.1093/pasj/58.1.69. Kuznetsov A.A., Keppens R., Xia C. Synthetic radio views of simulated solar flux ropes. Solar Phys. 2016, vol. 291, iss. 3, pp. 823-845. DOI: 10.1007/s11207-016-0865-6. Hou Y.J., Zhang J., Li T., et al. Eruption of a multi-flux-rope system in solar active region 12673 leading to the two largest flares in solar cycle 24 // Astron. Astrophys. 2018. Vol. 619, A100. DOI: 10.1051/0004-6361/201732530. Lee J., White S.M., Gopalswamy N., Kundu M.R. Signatures of coronal currents in microwave images. Solar Phys. 1997, vol. 174, iss. 1/2, pp. 175-190. DOI: 10.1023/A:1004956422669. Inoue S., Shiota D., Bamba Y., Park S.-H. Magnetohydrodynamic modeling of a solar eruption associated with an X9.3 flare observed in the active region 12673 // Astrophys. J. 2018. Vol. 867, iss. 1, 83. DOI: 10.3847/1538-4357/aae079. Lesovoi S.V., Altyntsev A.T., Kochanov A.A., Grechnev V.V., Gubin A.V., Zhdanov D.A., et al. Siberian Radioheliograph: First results. Solar-Terr. Phys. 2017, vol. 3, iss. 1, pp. 3-18. DOI: 10.12737/article_58f96ec60fec52.86165286. Kundu M.R., Alissandrakis C.E. Structure and polarization of active region microwave emission // Solar Phys. 1984. Vol. 94, iss. 2. P. 249-283. DOI: 10.1007/BF00151317. Nakajima H., Nishio M., Enome S., Shibasaki K., Takano T., Hanaoka Y., et al. The Nobeyama radioheliograph. Proc. IEEE. 1994, vol. 82, iss. 5, pp. 705-713. Kundu M.R., Velusamy T. Observation with the VLA of a stationary loop structure on the Sun at 6 centimeter wavelength // Astrophys. J. Lett. 1980. Vol. 240. P. L63-L67. DOI: 10.1086/183324. Quiñones J.A., Korzhavin A.N., Peterova N.G., Santos J. Observations of the solar eclipse on March 7, 1970 with the polarimeter of the Havana Radio Astronomical Station at 4.5 cm. Solnechnye Dannye [Solar Data]. 1975, no. 3, pp. 87-96. (In Russian). Kundu M.R., Alissandrakis C.E., Bregman J.D., Hin A.C. 6 centimeter observations of solar active regions with 6" resolution // Astrophys. J. 1977. Vol. 213. P. 278-295. DOI: 10.1086/155155. Rudenko I.G., Rudenko G.V., Uralov A.M. Radio source above neutral line in active regions generating long-lasted X-flares. Trudy Vserossiiskoi konferentsii “Mnogovolnovye issledovaniya Solntsa i sovremennye problemy solnechnoi aktivnosti” [Proc. All-Russian Conference “Multiwavelength Investigations of the Sun and Modern Problems of Solar Activity”]. Russia, N. Arkhyz, St. Petersburg, 2007, pp. 462-474. (In Russian). Kundu M.R., Schmahl E.J., Rao A.P. VLA observations of solar active regions at 6 cm wavelength // Astron. Astrophys. 1981. Vol. 94, no. 1. P. 72-79. Rudenko G.V., Myshyakov I.I. Analysis of reconstruction methods for nonlinear force-free fields. Solar Phys. 2009, vol. 257, iss. 2, pp. 287-304. DOI: 10.1007/s11207-009-9389-7. Kuznetsov A.A., Keppens R., Xia C. Synthetic radio views of simulated solar flux ropes // Solar Phys. 2016. Vol. 291, iss. 3. P. 823-845. DOI: 10.1007/s11207-016-0865-6. Scherrer P.H., Schou J., Bush R.I., Kosovichev A.G., Bogart R.S., Hoeksema J.T., Liu Y., Duvall T.L., Zhao J., Title A.M., et al. The Helioseismic and Magnetic Imager (HMI) investigation for the Solar Dynamics Observatory (SDO). Solar Phys. 2012, vol. 275, pp. 207-227. DOI: 10.1007/s11207-011-9834-2. Lee J., White S.M., Gopalswamy N., Kundu M.R. Signatures of coronal currents in microwave images // Solar Phys. 1997. Vol. 174, iss. 1/2. P. 175-190. DOI: 10.1023/A:1004956422669. Smolkov G.Ya., Pistolkors A.A., Treskov T.A., Krissinel B.B., Putilov V.A., Potapov N.N. The Siberian Solar Radio Telescope: Parameters and principle of operation, objectives and results of first observations of spatio-temporal properties of development of active regions and flares. Astrophys. Space Sci. 1986, vol. 119, iss. 1, pp. 1-4. DOI: 10.1007/BF00648801. Nakajima H., Nishio M., Enome S., et al. The Nobeyama radioheliograph // Proc. IEEE. 1994. Vol. 82, iss. 5. P. 705-713. Strong K.T., Alissandrakis C.E., Kundu M.R. Interpretation of microwave active region structures using SMM soft X-ray observations. Astrophys. J. 1984, vol. 277, pp. 865-873. DOI: 10.1086/161757. Rudenko G.V., Myshyakov I.I. Analysis of reconstruction methods for nonlinear force-free fields // Solar Phys. 2009. Vol. 257, iss. 2. P. 287-304. DOI: 10.1007/s11207-009-9389-7. Sych R.A., Uralov A.M., Korzhavin A.N. Radio observations of compact solar sources located between sunspots. Solar Phys. 1993, vol. 144, iss. 1, pp. 59-68. DOI: 10.1007/BF00667982. Scherrer P.H., Schou J., Bush R.I., et al. The Helioseismic and Magnetic Imager (HMI) investigation for the Solar Dynamics Observatory (SDO) // Solar Phys. 2012. Vol. 275. P. 207-227. DOI: 10.1007/s11207-011-9834-2. Uralov A.M., Sych R.A., Lubyshev B.I., Nefedyev V.P., Golovko A.A., Korobova Z.B., Alissandrakis C.E., Smartt R.N., Zhang Hongqi. Microwave source above neutral line as a factor of prediction of powerfull X-ray flares. Issledovaniya po geomagnetizmu, aeronomii i fizike Solntsa [Res. on Geomagnetism, Aeronomy and Solar Physics]. Novosibirsk, Nauka Publ., 1996, iss. 104, pp. 23-48. (In Russian). Smolkov G.Ya., Pistolkors A.A., Treskov T.A., et al. The Siberian Solar Radio Telescope: Parameters and principle of operation, objectives and results of first observations of spatio-temporal properties of development of active regions and flares // Astrophys. Space Sci. 1986. Vol. 119, iss. 1. P. 1-4. DOI: 10.1007/BF00648801. Uralov A.M., Sych R.A., Shchepkina V.L., Zubkova G.N., Smolkov G.Ya. Weakly polarized microwave sources in active regions prior to large X-flares. Solar Phys. 1998, vol. 183, iss. 2, pp. 359-368. DOI: 10.1023/A:1005041324807. Strong K.T., Alissandrakis C.E., Kundu M.R. Interpretation of microwave active region structures using SMM soft X-ray observations // Astrophys. J. 1984. Vol. 277. P. 865-873. DOI: 10.1086/161757. Uralov A.M., Nakajima H., Zandanov V.G., Grechnev V.V. Current-sheet-associated radio sources and development of the magnetosphere of an active region revealed from 17 GHz and Yohkoh data. Solar Phys. 2000, vol. 197, iss. 2, pp. 275-312. DOI: 10.1023/A:1026582416968. Sych R.A., Uralov A.M., Korzhavin A.N. Radio observations of compact solar sources located between sunspots // Solar Phys. 1993. Vol. 144, iss. 1. P. 59-68. DOI: 10.1007/BF00667982. Uralov A.M., Lesovoi S.V., Zandanov V.G., Grechnev V.V. Dual-filament initiation of a coronal mass ejection: Observations and model. Solar Phys. 2002, vol. 208, iss. 1, pp. 69-90. DOI: 10.1023/A:1019610614255. Uralov A.M., Sych R.A., Shchepkina V.L., et al. Weakly polarized microwave sources in active regions prior to large X-ray flares // Solar Phys. 1998. Vol. 183, iss. 2. P. 359-368. DOI: 10.1023/A:1005041324807. Uralov A.M., Rudenko G.V., Rudenko I.G. Microwave neutral line associated sources: birth, relation to flares, and projection effect. Bull. Russian Academy of Sciences: Physics. 2006, vol. 70, no. 10, pp. 1688-1691. Uralov A.M., Nakajima H., Zandanov V.G., Grechnev V.V. Current-sheet-associated radio sources and development of the magnetosphere of an active region revealed from 17 GHz and Yohkoh data // Solar Phys. 2000. Vol. 197, iss. 2. P. 275-312. DOI: 10.1023/A:1026582416968. Uralov A.M., Rudenko G.V., Rudenko I.G. 17 GHz neutral line associated sources: birth, motion, and projection effect. Publ. Astron. Soc. Japan. 2006, vol. 58, p. 21. DOI: 10.1093/pasj/58.1.21. Uralov A.M., Lesovoi S.V., Zandanov V.G., Grechnev V.V. Dual-filament initiation of a coronal mass ejection: observations and model // Solar Phys. 2002. Vol. 208, iss. 1. P. 69-90. DOI: 10.1023/A:1019610614255. Uralov A.M., Rudenko G.V., Grechnev V.V., Rudenko I.G., Nakajima H., Shibasaki K. Microwave source above neutral line as a source below current sheet. Trudy Vserossiiskoi konferentsii “Mnogovolnovye issledovaniya Solntsa i sovremennye problemy solnechnoi aktivnosti” [Proc. All-Russian Conference “Multiwavelength Investigations of the Sun and Modern Problems of Solar Activity”]. Russia, N. Arkhyz, St. Petersburg, 2007, pp. 484-513. (In Russian). Uralov A.M., Rudenko G.V., Rudenko I.G. 17 GHz neutral line associated sources: birth, motion, and projection effect // Publ. Astron. Soc. Japan. 2006. Vol. 58. P. 21. DOI: 10.1093/pasj/58.1.21. Uralov A.M., Grechnev V.V., Rudenko G.V., Rudenko I.G., Nakajima H. Microwave neutral line associated source and a current sheet. Solar Phys. 2008, vol. 249, pp. 315-335. DOI: 10.1007/s11207-008-9183-y. Uralov A.M., Grechnev V.V., Rudenko G.V., et al. Microwave neutral line associated source and a current sheet // Solar Phys. 2008. Vol. 249. P. 315-335. DOI: 10.1007/s11207-008-9183-y. van Tend W., Kuperus M. The development of coronal electric current systems in active regions and their relation to filaments and flares. Solar Phys. 1978, vol. 59, iss. 1, pp. 115-127. DOI: 10.1007/BF00154935. van Tend W., Kuperus M. The development of coronal electric current systems in active regions and their relation to filaments and flares // Solar Phys. 1978. Vol. 59, iss. 1. P. 115-127. DOI: 10.1007/BF00154935. Vatrushin S.M., Korzhavin A.N. Fizika solnechnoi plazmy [The physics of the solar plasma]. Moscow, Nauka Publ., 1989, p. 100. Verma M. The origin of two X-class flares in active region NOAA 12673. Shear flows and head-on collision of new and preexisting flux // Astron. Astrophys. 2018. Vol. 612, A101. 7 p. DOI: 10.1051/0004-6361/201732214. Verma M. The origin of two X-class flares in active region NOAA 12673. Shear flows and head-on collision of new and preexisting flux. Astron. Astrophys. 2018, vol. 612, A101, 7 p. DOI: 10.1051/0004-6361/201732214. Wang H., Yurchyshyn V., Liu C., et al. Strong transverse photosphere magnetic fields and twist in light bridge dividing delta sunspot of active region 12673 // Res. Notes Amer. Astron. Soc. 2018. Vol. 2, iss. 1, 8. DOI: 10.3847/2515-5172/aaa670. Wang H., Yurchyshyn V., Liu C., Ahn K., Toriumi S., Cao W. Strong transverse photosphere magnetic fields and twist in light bridge dividing delta sunspot of active region 12673. Res. Notes American Astron. Soc. 2018, vol. 2, iss. 1, article id. 8. DOI: 10.3847/2515-5172/aaa670. Wheatland M.S., Sturrock P.A., Roumeliotis G. An optimization approach to reconstructing force-free fields // Astrophys. J. 2000. Vol. 540, iss. 2. P. 1150-1155. DOI: 10.1086/309355. Wheatland M.S., Sturrock P.A., Roumeliotis G. An optimization approach to reconstructing force-free fields. Astrophys. J. 2000, vol. 540, iss. 2, pp. 1150-1155. DOI: 10.1086/309355. Yang Sh., Zhang J., Zhu X., Song Q. Block-induced complex structures building the flare-productive solar active region 12673 // Astrophys. J. Lett. 2017. Vol. 849, iss. 2. L21. 7 p. DOI: 10.3847/2041-8213/aa9476. Yang Sh., Zhang J., Zhu X., Song Q. Block-induced complex structures building the flare-productive solar active region 12673. Astrophys. J. Lett. 2017, vol. 849, iss. 2, L21, 7 p. DOI: 10.3847/2041-8213/aa9476. Yasnov L.V. On the nature of neutral-line-associated radio sources // Solar Phys. 2014. Vol. 289. P. 1215-1225. DOI: 10.1007/s11207-013-0396-3. Yasnov L.V. On the nature of neutral-line-associated radio sources. Solar Phys. 2014, vol. 289, pp. 1215-1225. DOI: 10.1007/s11207-013-0396-3. Zaitsev V.V. Gyrosynchrotron Model of microwave sources associated with the magnetic field neutral line // Geomagnetism and Aeronomy. 2019. Vol. 59. P. 898-903. DOI: 10.1134/S0016793219070284. Zaitsev V.V. Gyrosynchrotron model of microwave sources associated with the magnetic field neutral line. Geomagnetism and Aeronomy. 2019, vol. 59, pp. 898-903. DOI: 10.1134/S0016793219070284. Zou P., Jiang Ch., Feng X., et al. A two-step magnetic reconnection in a confined X-class flare in solar active region 12673 // Astrophys. J. 2019. Vol. 870, iss. 2, 97. 8 p. DOI: 10.3847/1538-4357/aaf3b7. URL: Zou P., Jiang Ch., Feng X., Zuo P., Wang Y. A two-step magnetic reconnection in a confined X-class flare in solar active region 12673. Astrophys. J. 2019, vol. 870, iss. 2, 97, 8 p. DOI: 10.3847/1538-4357/aaf3b7. Zou P., Jiang Ch., Fengsi W., et al. Continuous null-point magnetic reconnection builds up a torus unstable magnetic flux rope triggering the X9.3 flare in solar AR 12673 // Astrophys. J. 2020. Vol. 890, iss. 1, 10. 8 p. DOI: 10.3847/1538-4357/ab6aa8. Zou P., Jiang Ch., Fengsi W., Feng X., Zuo P., Wang Y. Continuous null-point magnetic reconnection builds up a torus unstable magnetic flux rope triggering the X9.3 flare in solar AR 12673. Astrophys. J. 2020, vol. 890, iss. 1, 10, 8 p. DOI: 10.3847/1538-4357/ab6aa8. URL: https://cdaw.gsfc.nasa.gov/CME_list (дата обращения 25 сентября 2020 г.). URL: https://cdaw.gsfc.nasa.gov/CME_list (accessed September 25, 2020). URL: ckp-rf.ru/usu/73606 (дата обращения 25 сентября 2020 г.). URL: ckp-rf.ru/usu/73606 (accessed September 25, 2020).