Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 64260 10.12737/stp-94202308 Results of current research Results of current research Results of current research Main statistical properties of hectometric continuum radiation in near-Earth space Main statistical properties of hectometric continuum radiation in near-Earth space Дорофеев Даниил Алексеевич Dorofeev Daniil Alekseevich dadorofeev_1@edu.hse.ru Чернышов Александр Александрович Chernyshov Aleksandr Aleksandrovich achernyshov@iki.rssi.ru https://orcid.org/0000-0002-5809-0921 Чугунин Дмитрий Владимирович Chugunin Dmitriy Vladimirovich dimokch@mail.ru Могилевский Михаил Менделевич Mogilevsky Michael Mendelevich mogilevsky2012@gmail.com

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Высшая школа экономики Москва Россия Higher School of Economics Moscow Russian Federation Институт космических исследований РАН Москва Россия Space Research Institute RAS Moscow Russian Federation Институт космических исследований РАН Москва Россия Space Research Institute of RAS Moscow Russian Federation Институт космических исследований РАН Москва Россия Space Research Institute of RAS Moscow Russian Federation Институт космических исследований РАН Москва Россия Space Research Institute of RAS Moscow Russian Federation 28 12 2023 28 12 2023 9 4 63 71 03 05 2023 27 01 2023 https://zh-szf.ru/en/nauka/article/64260/view

In this work, we have studied the recently discovered hectometric continuum radiation in near-Earth plasma. We have carried out a detailed statistical analysis of the occurrence of a hectometric continuum near Earth at distances 1.1–2 Re, where Re is the Earth radius, for a two-year period, using data from the ERG (Arase) satellite. We have established that the generation of the hectometric radiation depends on the local magnetic time. The continuum radiation of this type is shown to occur mainly at night and in the morning. We have also studied the dependence of the occurrence of hectometric radiation on geomagnetic activity and have demonstrated that there is no direct dependence of the occurrence of hectometric radiation on geomagnetic disturbances. Moreover, the statistical analysis made it possible to localize sources of radio emission of this type in near-Earth space and to show that the source(s) of generation of the hectometric continuum radiation is located at low latitudes.

In this work, we have studied the recently discovered hectometric continuum radiation in near-Earth plasma. We have carried out a detailed statistical analysis of the occurrence of a hectometric continuum near Earth at distances 1.1–2 Re, where Re is the Earth radius, for a two-year period, using data from the ERG (Arase) satellite. We have established that the generation of the hectometric radiation depends on the local magnetic time. The continuum radiation of this type is shown to occur mainly at night and in the morning. We have also studied the dependence of the occurrence of hectometric radiation on geomagnetic activity and have demonstrated that there is no direct dependence of the occurrence of hectometric radiation on geomagnetic disturbances. Moreover, the statistical analysis made it possible to localize sources of radio emission of this type in near-Earth space and to show that the source(s) of generation of the hectometric continuum radiation is located at low latitudes.

 radio emission hectometric continuum radiation magnetosphere satellite measurements radio emission hectometric continuum radiation magnetosphere satellite measurements The work of A.A. Chernyshov was supported by the Foundation for the Development of Theoretical Physics and Mathematics “BASIS” The work of A.A. Chernyshov was supported by the Foundation for the Development of Theoretical Physics and Mathematics “BASIS”

Benediktov E.A., Getmancev G.G., Mitjakov N.A., Rapoport V.A., Sazonov Ju.A., Tarasov A.F. Results of measuring the intensity of radio emissions at 725 and 1525 kHz frequencies using the equipment installed on “ELECTRON-2” satellite. Issledovanija kosmicheskogo prostranstva [Space exploration]. Moscow, Nauka Publ., 1965, 581 p. (In Russian). Benediktov E.A., Getmancev G.G., Mitjakov N.A., Rapoport V.A., Sazonov Ju.A., Tarasov A.F. Results of measuring the intensity of radio emissions at 725 and 1525 kHz frequencies using the equipment installed on “ELECTRON-2” satellite. Issledovanija kosmicheskogo prostranstva [Space exploration]. Moscow, Nauka Publ., 1965, 581 p. (In Russian). Benson R.F., Calvert W. ISIS-1 observations of the source of AKR. Geophys. Res. Lett. 1979, vol. 6, p. 479. Benson R.F., Calvert W. ISIS-1 observations of the source of AKR. Geophys. Res. Lett. 1979, vol. 6, p. 479. Brown L.W. The galactic radio spectrum between 130 kHz and 2600 kHz. Astrophys. J. 1973, vol. 180, pp. 359-370. Brown L.W. The galactic radio spectrum between 130 kHz and 2600 kHz. Astrophys. J. 1973, vol. 180, pp. 359-370. Carpenter D.L., Anderson R.R., Calvert W., Moldwin M.B. CRRES Observations of Density Cavities Inside the Plasmasphere. J. Geophys. Res. 2000, vol. 105, pp. 23323-23338. DOI: 10.1029/2000JA000013. Carpenter D.L., Anderson R.R., Calvert W., Moldwin M.B. CRRES Observations of Density Cavities Inside the Plasmasphere. J. Geophys. Res. 2000, vol. 105, pp. 23323-23338. DOI: 10.1029/2000JA000013. Chernyshov A.A., Chugunin D.V., Mogilevsky M.M. Auroral kilometric radiation as a diagnostic tool for the properties of the magnetosphere. JETP Lett. 2022, vol. 115, iss. 1, pp. 23-28. DOI: 10.1134/S0021364022010076. Chernyshov A.A., Chugunin D.V., Mogilevsky M.M. Auroral kilometric radiation as a diagnostic tool for the properties of the magnetosphere. JETP Lett. 2022, vol. 115, iss. 1, pp. 23-28. DOI: 10.1134/S0021364022010076. Chugunin D.V., Chernyshov A.A., Moiseenko I.L., Viktorov M.E., Mogilevsky M.M. Monitoring or the electron-acceleration region with auroral kilometric radiation. Geomagnetism and Aeronomy. 2020, vol. 60, iss. 5, pp. 538-546. DOI: 10.1134/S0016793220040039. Chugunin D.V., Chernyshov A.A., Moiseenko I.L., Viktorov M.E., Mogilevsky M.M. Monitoring or the electron-acceleration region with auroral kilometric radiation. Geomagnetism and Aeronomy. 2020, vol. 60, iss. 5, pp. 538-546. DOI: 10.1134/S0016793220040039. Dao E., Kelley M.C., Roddy P., Retterer J.M., Ballenthin J., de La Beaujardiere O., Su Y.-J. Longitudinal and seasonal dependence of nighttime equatorial plasma density irregularities during solar minimum detected on the C/NOFS satellite. Geophys. Res. Lett. 2011, vol. 38, iss. 1, L10104. DOI: 10.1029/2011GL047046. Dao E., Kelley M.C., Roddy P., Retterer J.M., Ballenthin J., de La Beaujardiere O., Su Y.-J. Longitudinal and seasonal dependence of nighttime equatorial plasma density irregularities during solar minimum detected on the C/NOFS satellite. Geophys. Res. Lett. 2011, vol. 38, iss. 1, L10104. DOI: 10.1029/2011GL047046. Green J.L., Sandel B.R., Fung S.F., Gallagher D.L. Reinisch B. On the origin of kilometric continuum. J. Geophys. Res. 2002, vol. 107, no. A7, 1105. DOI: 10.1029/2001JA000193. Green J.L., Sandel B.R., Fung S.F., Gallagher D.L. Reinisch B. On the origin of kilometric continuum. J. Geophys. Res. 2002, vol. 107, no. A7, 1105. DOI: 10.1029/2001JA000193. Green J.L., Boardsen S., Fung S.F., Matsumoto H., Hashimoto K., Anderson R.R., et al. Association of kilometric continuum radiation with plasmaspheric structures. J. Geophys. Res. 2004, vol. 109, A03203. DOI: 10.1029/2003JA010093. Green J.L., Boardsen S., Fung S.F., Matsumoto H., Hashimoto K., Anderson R.R., et al. Association of kilometric continuum radiation with plasmaspheric structures. J. Geophys. Res. 2004, vol. 109, A03203. DOI: 10.1029/2003JA010093. Gurnett D.A. The Earths as a radio source: Terrestrial kilometric radiation. J. Geophys. Res. 1974, vol. 79, iss. 28, pp. 4227-4238. DOI: 10.1029/JA079I028P04227. Gurnett D.A. The Earths as a radio source: Terrestrial kilometric radiation. J. Geophys. Res. 1974, vol. 79, iss. 28, pp. 4227-4238. DOI: 10.1029/JA079I028P04227. Gurnett D.A. The Earth as a radio source: The nonthermal continuum. J. Geophys. Res. 1975, vol. 80, pp. 2751-2763. DOI: 10.1029/JA080I019P02751. Gurnett D.A. The Earth as a radio source: The nonthermal continuum. J. Geophys. Res. 1975, vol. 80, pp. 2751-2763. DOI: 10.1029/JA080I019P02751. Hanasz J., de Feraudy H., Schreiber R., Parks G., Brittnacher M., Mogilevsky M.M., Romantsova T.V. Wideband bursts of auroral kilometric radiation and their association with UV auroral bulges J. Geophys. Res. 2001, vol. 106, pp. 3859-3872. DOI: 10.1029/2000JA900098. Hanasz J., de Feraudy H., Schreiber R., Parks G., Brittnacher M., Mogilevsky M.M., Romantsova T.V. Wideband bursts of auroral kilometric radiation and their association with UV auroral bulges J. Geophys. Res. 2001, vol. 106, pp. 3859-3872. DOI: 10.1029/2000JA900098. Hashimoto K., Calvert K.W., Matsumoto H. Kilometric continuum detected by GEOTAIL. J. Geophys. Res. 1999, vol. 104, pp. 28645-28656. DOI: 10.1029/1999JA900365. Hashimoto K., Calvert K.W., Matsumoto H. Kilometric continuum detected by GEOTAIL. J. Geophys. Res. 1999, vol. 104, pp. 28645-28656. DOI: 10.1029/1999JA900365. Hashimoto K., Anderson R.R., Green J.L., Matsumoto H. Source and propagation characteristics of kilometric continuum observed with multiple satellites. J. Geophys. Res. 2005, vol. 110, A09229. DOI: 10.1029/2004JA010729. Hashimoto K., Anderson R.R., Green J.L., Matsumoto H. Source and propagation characteristics of kilometric continuum observed with multiple satellites. J. Geophys. Res. 2005, vol. 110, A09229. DOI: 10.1029/2004JA010729. Hashimoto K., Kumamoto A., Tsuchiya F., Kasahara Y., Matsuoka A. Hectometric line spectra detected by the Arase (ERG) satellite. Geophys. Res. Lett. 2018, vol. 45, iss. 21, pp. 11555-11561. DOI: 10.1029/2018GL080133. Hashimoto K., Kumamoto A., Tsuchiya F., Kasahara Y., Matsuoka A. Hectometric line spectra detected by the Arase (ERG) satellite. Geophys. Res. Lett. 2018, vol. 45, iss. 21, pp. 11555-11561. DOI: 10.1029/2018GL080133. Hashimoto K., Shinbori A., OtsukaY., Tsuchiya F., Kumamoto A., Kasahara Y., et al. Propagation mechanism of medium wave broadcasting waves observed by the Arase satellite: Hectometric line spectra. J. Geophys. Res. 2021, vol. 126, iss. 11, e2021JA029813. DOI: 10.1029/2021JA029813. Hashimoto K., Shinbori A., OtsukaY., Tsuchiya F., Kumamoto A., Kasahara Y., et al. Propagation mechanism of medium wave broadcasting waves observed by the Arase satellite: Hectometric line spectra. J. Geophys. Res. 2021, vol. 126, iss. 11, e2021JA029813. DOI: 10.1029/2021JA029813. Jones D. Latitudinal beaming of planetary radio emissions. Nature. 1980, vol. 288, pp. 225-229. DOI: 10.1038/288225A0. Jones D. Latitudinal beaming of planetary radio emissions. Nature. 1980, vol. 288, pp. 225-229. DOI: 10.1038/288225A0. Kasaba Y., Matsumoto H., Hashimoto K., Anderson R.R. The angular distribution of auroral kilometric radiation observed by GEOTAIL spacecraft. Geophys. Res. Lett. 1997, vol. 24, pp. 2483-2486. Kasaba Y., Matsumoto H., Hashimoto K., Anderson R.R. The angular distribution of auroral kilometric radiation observed by GEOTAIL spacecraft. Geophys. Res. Lett. 1997, vol. 24, pp. 2483-2486. Kasaba Y., Matsumoto H., Hashimoto K., Anderson R.R., Bougeret J.-L., Kaiser M.L., et al. Remote sensing of the plasmapause during substorms: GEOTAIL observation of nonthermal continuum enhancement. J. Geophys. Res.: Atmos. 1998, vol. 103, no. A9, pp. 20389-20406. DOI: 10.1029/98JA00809. Kasaba Y., Matsumoto H., Hashimoto K., Anderson R.R., Bougeret J.-L., Kaiser M.L., et al. Remote sensing of the plasmapause during substorms: GEOTAIL observation of nonthermal continuum enhancement. J. Geophys. Res.: Atmos. 1998, vol. 103, no. A9, pp. 20389-20406. DOI: 10.1029/98JA00809. Kasahara Y., Kasaba Y., Kojima H., et al. The Plasma Wave Experiment (PWE) on board the Erase (ERG) satellite. Earth, Planets and Space. 2018, vol. 70, 86. DOI: 10.1186/s40623-018-0842-4. Kasahara Y., Kasaba Y., Kojima H., et al. The Plasma Wave Experiment (PWE) on board the Erase (ERG) satellite. Earth, Planets and Space. 2018, vol. 70, 86. DOI: 10.1186/s40623-018-0842-4. Kolpak V.I., Mogilevsky M.M., Chugunin D.V., Chernyshov A.A., Moiseenko I.L., Kumamoto A., et al. Statistical properties of auroral kilometer radiation: based on ERG (Arase) satellite data. Solar-Terr. Phys. 2021, vol. 7, no. 1, pp. 11-16. DOI: 10.12737/stp-71202102. Kolpak V.I., Mogilevsky M.M., Chugunin D.V., Chernyshov A.A., Moiseenko I.L., Kumamoto A., et al. Statistical properties of auroral kilometer radiation: based on ERG (Arase) satellite data. Solar-Terr. Phys. 2021, vol. 7, no. 1, pp. 11-16. DOI: 10.12737/stp-71202102. Kumamoto A., Tsuchiya F., Kasahara Y., Kasaba Y., Kojima H., Yagitani S., et al. High Frequency Analyzer (HFA) of Plasma Wave Experiment (PWE) onboard the Arase spacecraft. Earth, Planets and Space. 2018, vol. 70, 82. DOI: 10.1186/s40623-018-0854-0. Kumamoto A., Tsuchiya F., Kasahara Y., Kasaba Y., Kojima H., Yagitani S., et al. High Frequency Analyzer (HFA) of Plasma Wave Experiment (PWE) onboard the Arase spacecraft. Earth, Planets and Space. 2018, vol. 70, 82. DOI: 10.1186/s40623-018-0854-0. Kuril’chik V.N. Observations of the auroral hectometric radio emissions onboard the INTERBALL-1 satellite.Cosmic Res. 2007, vol. 45, no. 3, pp. 248-252. Kuril’chik V.N. Observations of the auroral hectometric radio emissions onboard the INTERBALL-1 satellite.Cosmic Res. 2007, vol. 45, no. 3, pp. 248-252. Kuril'chik V.N., Grigor’eva V.P., Tirpak A., Mironov S.V., Fisher L., Yaroshevich A. Observations of a nonthermal continuum in the southern subpolar region of the Earth’s magnetosphere by the Prognoz-10 INTERKOSMOS satellite. Kosmicheskie issledovaniya [Cosmic Research]. 1992, vol. 30, no. 2, pp. 231-242. (In Russian). Kuril'chik V.N., Grigor’eva V.P., Tirpak A., Mironov S.V., Fisher L., Yaroshevich A. Observations of a nonthermal continuum in the southern subpolar region of the Earth’s magnetosphere by the Prognoz-10 INTERKOSMOS satellite. Kosmicheskie issledovaniya [Cosmic Research]. 1992, vol. 30, no. 2, pp. 231-242. (In Russian). Kuril’chik V.N., Kopaeva I.F., Mironov S.V. INTERBALL-1 observations of the kilometric “continuum” of the Earth’s magnetosphere. Cosmic Res. 2004, vol. 42, no. 1, pp. 1-7. Kuril’chik V.N., Kopaeva I.F., Mironov S.V. INTERBALL-1 observations of the kilometric “continuum” of the Earth’s magnetosphere. Cosmic Res. 2004, vol. 42, no. 1, pp. 1-7. Kurth W.S. Detailed observations of the source of terrestrial narrowband electromagnetic radiation. Geophys. Res. Lett. 1982, vol. 9, pp. 1341-1344. Kurth W.S. Detailed observations of the source of terrestrial narrowband electromagnetic radiation. Geophys. Res. Lett. 1982, vol. 9, pp. 1341-1344. Kurth W.S., Murata T., Lu G., Gurnett D.A., Matsumoto H. Auroral kilometric radiation and the auroral electrojet index for the January 1997 magnetic cloud event. Geophys. Res. Lett. 1998, vol. 25, iss. 15, pp. 3027-3030. DOI: 10.1029/98GL00404. Kurth W.S., Murata T., Lu G., Gurnett D.A., Matsumoto H. Auroral kilometric radiation and the auroral electrojet index for the January 1997 magnetic cloud event. Geophys. Res. Lett. 1998, vol. 25, iss. 15, pp. 3027-3030. DOI: 10.1029/98GL00404. Louarn P., Le Quéau D. Generation of the auroral kilometric radiation in plasma cavities - II. The cyclotron maser instability in small size sources. Planet. Space Sci. 1996, vol. 44, no. 3, pp. 211-224. Louarn P., Le Quéau D. Generation of the auroral kilometric radiation in plasma cavities - II. The cyclotron maser instability in small size sources. Planet. Space Sci. 1996, vol. 44, no. 3, pp. 211-224. Melrose D.B. A theory for the nonthermal radio continua in the terrestrial and Jovian magnetospheres. J. Geophys. Res. 1981, vol. 86, pp. 30-36. DOI: 10.1029/JA086IA01P00030. Melrose D.B. A theory for the nonthermal radio continua in the terrestrial and Jovian magnetospheres. J. Geophys. Res. 1981, vol. 86, pp. 30-36. DOI: 10.1029/JA086IA01P00030. Miyoshi Y., Shinohara I., Takashima T., Asamura K., Higashio N., Mitani T., et al. Geospace exploration project ERG. Earth, Planets and Space. 2018a, vol. 70, 101. DOI: 10.1186/ s40623-018-0862-0. Miyoshi Y., Shinohara I., Takashima T., Asamura K., Higashio N., Mitani T., et al. Geospace exploration project ERG. Earth, Planets and Space. 2018a, vol. 70, 101. DOI: 10.1186/ s40623-018-0862-0. Miyoshi Y., Hori T., Shoji M., Teramoto M., Chang T.F., Segawa T., et al. The ERG Science Center. Earth, Planets and Space. 2018b, vol. 70, 96. DOI: 10.1186/s40623-018-0867-8. Miyoshi Y., Hori T., Shoji M., Teramoto M., Chang T.F., Segawa T., et al. The ERG Science Center. Earth, Planets and Space. 2018b, vol. 70, 96. DOI: 10.1186/s40623-018-0867-8. Mogilevsky M.M., Moiseenko I.L., Hanasz J. Spectral variations and long-period intensity variations of auroral kilometric radiation from INTERBALL-2 satellite measurements. Astron. Lett. 2005, vol. 31, no. 6, pp. 422-426. Mogilevsky M.M., Moiseenko I.L., Hanasz J. Spectral variations and long-period intensity variations of auroral kilometric radiation from INTERBALL-2 satellite measurements. Astron. Lett. 2005, vol. 31, no. 6, pp. 422-426. Mogilevsky M.M., Chugunin D.V., Chernyshov A.A., Romantsova T.V., Moiseenko I.L., Kumamoto A., et al. Localization of sources of two types of continuum radiation. JETP Lett. 2021, vol. 114, pp. 23-28. DOI: 10.1134/S0021364021130075. Mogilevsky M.M., Chugunin D.V., Chernyshov A.A., Romantsova T.V., Moiseenko I.L., Kumamoto A., et al. Localization of sources of two types of continuum radiation. JETP Lett. 2021, vol. 114, pp. 23-28. DOI: 10.1134/S0021364021130075. Morooka M., Mukai T. Density as a controlling factor for seasonal and latitudinal variations of the auroral particle acceleration region. J. Geophys. Res. 2003, vol. 108, no. A7, 1306. DOI: 10.1029/2002JA009786. Morooka M., Mukai T. Density as a controlling factor for seasonal and latitudinal variations of the auroral particle acceleration region. J. Geophys. Res. 2003, vol. 108, no. A7, 1306. DOI: 10.1029/2002JA009786. Okuda H., Chance M.S., Ashour-Abdalla M., Kurth W.S. Generation of nonthermal continuum radiation in the magnetosphere. J. Geophys. Res. 1982, vol. 87, no A12, pp. 10457-10462. Okuda H., Chance M.S., Ashour-Abdalla M., Kurth W.S. Generation of nonthermal continuum radiation in the magnetosphere. J. Geophys. Res. 1982, vol. 87, no A12, pp. 10457-10462. Otsuka Y. Review of the generation mechanisms of post-midnight irregularities in the equatorial and low-latitude ionosphere. Progress Earth Planet. Sci. 2018, vol. 5, iss. 1, 57. DOI: 10.1186/s40645-018-0212-7. Otsuka Y. Review of the generation mechanisms of post-midnight irregularities in the equatorial and low-latitude ionosphere. Progress Earth Planet. Sci. 2018, vol. 5, iss. 1, 57. DOI: 10.1186/s40645-018-0212-7. Ronnmark K. Generation of magnetospheric radiation by decay of Bernstein waves. Geophys. Res. Lett. 1985, vol. 12, pp. 639-642. DOI: 10.1029/GL012i010p00639. Ronnmark K. Generation of magnetospheric radiation by decay of Bernstein waves. Geophys. Res. Lett. 1985, vol. 12, pp. 639-642. DOI: 10.1029/GL012i010p00639. Treumann R.A. The electron-cyclotron maser for astrophysical application. Astron. Astrophys. Rev. 2006, vol. 13, no. 4, pp. 229-315. DOI: 10.1007/s00159-006-0001-y. Treumann R.A. The electron-cyclotron maser for astrophysical application. Astron. Astrophys. Rev. 2006, vol. 13, no. 4, pp. 229-315. DOI: 10.1007/s00159-006-0001-y. Turner J., Zarka P., Grießmeier J.-M., Lazio J., Cecconi B., Enriquez J.E., et al. The search for radio emissions from the exoplanetary systems 55 Cancri, υ Andromedae, and τ Boötis using LOFAR beam-formed observations. Astron. Astrophys. 2021, vol. 645, A59, 28 p. DOI: 10.1051/0004-6361/201937201. Turner J., Zarka P., Grießmeier J.-M., Lazio J., Cecconi B., Enriquez J.E., et al. The search for radio emissions from the exoplanetary systems 55 Cancri, υ Andromedae, and τ Boötis using LOFAR beam-formed observations. Astron. Astrophys. 2021, vol. 645, A59, 28 p. DOI: 10.1051/0004-6361/201937201. Voots G.R., Gurnett D.A., Akasofu S.I. Auroral kilometric radiation as an indicator of auroral magnetic disturbances. J. Geophys. Res. 1977, vol. 82, iss. 16, p. 2259. Voots G.R., Gurnett D.A., Akasofu S.I. Auroral kilometric radiation as an indicator of auroral magnetic disturbances. J. Geophys. Res. 1977, vol. 82, iss. 16, p. 2259. Wu C.S., Lee L.C. A theory of the terrestrial kilometric radiation Astrophys. J. 1979, vol. 230, p. 621. DOI: 10.1086/157120. Wu C.S., Lee L.C. A theory of the terrestrial kilometric radiation Astrophys. J. 1979, vol. 230, p. 621. DOI: 10.1086/157120. Zarka P. Auroral radio emissions at the outer planets: Observations and theories. J. Geophys. Res. 1998, vol. 103, pp. 20159-20194. DOI: 10.1029/98JE01323. Zarka P. Auroral radio emissions at the outer planets: Observations and theories. J. Geophys. Res. 1998, vol. 103, pp. 20159-20194. DOI: 10.1029/98JE01323. Zheleznyakov V.V., Zlotnik E.Ya., Zaitsev V.V., Shaposhnikov V.E. Double plasma resonance and its manifestations in radio astronomy. Phys. Usp. 2016, vol. 59, iss. 10, pp. 997-1020. DOI: 10.3367/UFNe.2016.05.037813. Zheleznyakov V.V., Zlotnik E.Ya., Zaitsev V.V., Shaposhnikov V.E. Double plasma resonance and its manifestations in radio astronomy. Phys. Usp. 2016, vol. 59, iss. 10, pp. 997-1020. DOI: 10.3367/UFNe.2016.05.037813. World Data Center for Geomagnetism, Kyoto; Nose M., Iyemori T., Sugiura M., Kamei T. Geomagnetic Dst index. 2015. DOI: 10.17593/14515-74000. World Data Center for Geomagnetism, Kyoto; Nose M., Iyemori T., Sugiura M., Kamei T. Geomagnetic Dst index. 2015. DOI: 10.17593/14515-74000. URL: https://ergsc.isee.nagoya-u.ac.jp/ (accessed July 5, 2023). URL: https://ergsc.isee.nagoya-u.ac.jp/ (accessed July 5, 2023). URL: https://wdc.kugi.kyoto-u.ac.jp/ (accessed July 5, 2023). URL: https://wdc.kugi.kyoto-u.ac.jp/ (accessed July 5, 2023).