Solar-Terrestrial Physics Solar-Terrestrial Physics Solar-Terrestrial Physics 2500-0535 71171 10.12737/stp-102202407 Results of current research Results of current research Results of current research Influence of ionospheric resonators on daily dynamics of the first Schumann resonance spectral parameters according to data from a meridional chain of ULF magnetometers Influence of ionospheric resonators on daily dynamics of the first Schumann resonance spectral parameters according to data from a meridional chain of ULF magnetometers https://orcid.org/0000-0002-9117-7498 Ермакова Елена Николаевна Ermakova Elena Nikolaevna l.ermakova@nirfi.unn.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 https://orcid.org/0000-0002-8460-1203 Рябов Александр Владимирович Ryabov Alexsandr Vladimirovich alexr@nirfi.unn.ru

кандидат физико-математических наук;

candidate of physical and mathematical sciences;

 Научно-исследовательский радиофизический институт Нижегородского университета Н. Новгород Россия Institute of Radiophysics of Nizhny Novgorod University Nizhny Novgorod Russian Federation Научно-исследовательский радиофизический институт Нижегородского университета Н. Новгород Россия Institute of Radiophysics of Nizhny Novgorod University Nizhny Novgorod Russian Federation 25 06 2024 25 06 2024 10 2 62 73 12 10 2023 01 03 2024 https://naukaru.ru/en/nauka/article/71171/view

We have experimentally studied the influence of the local ionosphere, namely the ionospheric Alfvén resonator (IAR) and the lower ionospheric resonator at altitudes 80–300 km (sub-IAR) on the amplitude and polarization of the first Schumann resonance. The study is based on spectral analysis of data from simultaneous monitoring of ULF magnetic noise components at a meridional chain of stations: high-latitude stations Barentsburg and Lovozero, mid-latitude observatory NNGU NIRFI (NL, Nizhny Novgorod Region), a low-latitude station in Israel. We have also used monitoring data from the Borok and Crete observatories. At the stations in dark conditions, significant variations were found in the spectrum of the polarization parameter ε at the frequency of the first Schumann resonance (SR). Moreover, these variations had different character at different observatories. Analysis of the daily dynamics of the parameter ε has shown that these variations are associated with the influence of local sub-IAR having different optical thickness and quality factor at these observatories. The influence of sub-IAR on polarization in the SR band was found to depend on the ratio of the boundary frequency fb (the frequency that separates the negative and positive polarization of ULF magnetic noise) to the frequency of the first SR. The IAR influence on the polarization and amplitude of magnetic fields in the frequency band of the first Schumann resonance was discovered only at the NL and Lovozero stations: a high-quality Alfvén resonator in the ionosphere above the NL station could cause the SR frequency band to change and its central frequency to shift. Analysis of low-frequency data from the observatories separated by distances of 400 km has revealed that the influence of local ionospheric resonators can lead to a difference in the amplitude characteristics of the first SR even at such distances. It has also been shown that the influence of the IAR and sub-IAR resonators on the azimuthal angle of the magnetic field vector in the frequency band of the first SR is less noticeable and can generate variations in this parameter by 10°–20°. Numerical calculations performed for the spherical waveguide model made it possible to adequately interpret the features of the daily dynamics of the parameter ε in the frequency range of the first SR.

We have experimentally studied the influence of the local ionosphere, namely the ionospheric Alfvén resonator (IAR) and the lower ionospheric resonator at altitudes 80–300 km (sub-IAR) on the amplitude and polarization of the first Schumann resonance. The study is based on spectral analysis of data from simultaneous monitoring of ULF magnetic noise components at a meridional chain of stations: high-latitude stations Barentsburg and Lovozero, mid-latitude observatory NNGU NIRFI (NL, Nizhny Novgorod Region), a low-latitude station in Israel. We have also used monitoring data from the Borok and Crete observatories. At the stations in dark conditions, significant variations were found in the spectrum of the polarization parameter ε at the frequency of the first Schumann resonance (SR). Moreover, these variations had different character at different observatories. Analysis of the daily dynamics of the parameter ε has shown that these variations are associated with the influence of local sub-IAR having different optical thickness and quality factor at these observatories. The influence of sub-IAR on polarization in the SR band was found to depend on the ratio of the boundary frequency fb (the frequency that separates the negative and positive polarization of ULF magnetic noise) to the frequency of the first SR. The IAR influence on the polarization and amplitude of magnetic fields in the frequency band of the first Schumann resonance was discovered only at the NL and Lovozero stations: a high-quality Alfvén resonator in the ionosphere above the NL station could cause the SR frequency band to change and its central frequency to shift. Analysis of low-frequency data from the observatories separated by distances of 400 km has revealed that the influence of local ionospheric resonators can lead to a difference in the amplitude characteristics of the first SR even at such distances. It has also been shown that the influence of the IAR and sub-IAR resonators on the azimuthal angle of the magnetic field vector in the frequency band of the first SR is less noticeable and can generate variations in this parameter by 10°–20°. Numerical calculations performed for the spherical waveguide model made it possible to adequately interpret the features of the daily dynamics of the parameter ε in the frequency range of the first SR.

 ionospheric resonators magnetic noise Schumann resonance polarization spectral parameters resonance spectral structure ionospheric resonators magnetic noise Schumann resonance polarization spectral parameters resonance spectral structure The work was carried out under Project No. FSWR-2023-0038 within the framework of the basic part of the Government assignment of the Ministry of Science and Higher Education of the Russian Federation The work was carried out under Project No. FSWR-2023-0038 within the framework of the basic part of the Government assignment of the Ministry of Science and Higher Education of the Russian Federation

Belyaev P.P., Polyakov S.V., Rapoport V.O., Trakhtengerts V.Yu. Detection of the resonant structure of the spectrum of the atmospheric electromagnetic noise background in the range of short-period geomagnetic pulsations. Doklady AN SSSR [Reports of the Academy of Sciences of the USSR]. 1987, vol. 297, pp. 840–843. (In Russian). Belyaev P.P., Polyakov S.V., Rapoport V.O., Trakhtengerts V.Yu. Detection of the resonant structure of the spectrum of the atmospheric electromagnetic noise background in the range of short-period geomagnetic pulsations. Doklady AN SSSR [Reports of the Academy of Sciences of the USSR]. 1987, vol. 297, pp. 840–843. (In Russian). Belyaev P.P., Polyakov C.V., Rapoport V.O., Trakhtengerts V.Yu. Experimental studies of the spectral resonance structure of the atmospheric electromagnetic noise background within the range of short-period geomagnetic pulsations. Radiophys. Quantum Electron. 1989, vol. 32, no 6, pp.491–501. DOI: 10.1007/BF01058169. Belyaev P.P., Polyakov C.V., Rapoport V.O., Trakhtengerts V.Yu. Experimental studies of the spectral resonance structure of the atmospheric electromagnetic noise background within the range of short-period geomagnetic pulsations. Radiophys. Quantum Electron. 1989, vol. 32, no 6, pp.491–501. DOI: 10.1007/BF01058169. Bosinger T., Demekhov A.G., Ermakova E.N., Haldoupis C., Zhou Q. Pulsating nighttime magnetic background noise in the upper ULF band at low latitudes, J. Geophys. Res.: Space Phys. 2014, vol. 119, no. 5, pp. 4109–4119. DOI: 10.1002/ 2014ja019906. Bosinger T., Demekhov A.G., Ermakova E.N., Haldoupis C., Zhou Q. Pulsating nighttime magnetic background noise in the upper ULF band at low latitudes, J. Geophys. Res.: Space Phys. 2014, vol. 119, no. 5, pp. 4109–4119. DOI: 10.1002/ 2014ja019906. Bösinger T., Shalimov S.L. Dispersive changes in magnetic background noise polarization at 0.1 to 6 Hz during sunset and sunrise at L=1.3, Ann. Geophys. 2004, vol. 22, no. 6, pp. 1–12. DOI: 10.5194/angeo-22-1989-2004. Bösinger T., Shalimov S.L. Dispersive changes in magnetic background noise polarization at 0.1 to 6 Hz during sunset and sunrise at L=1.3, Ann. Geophys. 2004, vol. 22, no. 6, pp. 1–12. DOI: 10.5194/angeo-22-1989-2004. Ermakova E.N., Kotik D.S., Polyakov S.V., Shennikov A.V. On a mechanism forming a broadband maximum in the spectrum of background noise at frequencies 2–6 Hz. Radiophys. Quantum Electron. 2007, vol. 50, no7, pp. 555–569. DOI: 10.1007/s11141-007-0049-1. Ermakova E.N., Kotik D.S., Polyakov S.V., Shennikov A.V. On a mechanism forming a broadband maximum in the spectrum of background noise at frequencies 2–6 Hz. Radiophys. Quantum Electron. 2007, vol. 50, no7, pp. 555–569. DOI: 10.1007/s11141-007-0049-1. Ermakova E.N., Polyakov S.V., Semenova N.V. A study of resonance structures with different scales in the spectrum of background extremely low frequency noise at middle latitudes. Radiophys. Quantum Electron. 2011, vol. 54, no. 12, pp. 796–804. DOI: 10.1007/s11141-012-9341-9. Ermakova E.N., Polyakov S.V., Semenova N.V. A study of resonance structures with different scales in the spectrum of background extremely low frequency noise at middle latitudes. Radiophys. Quantum Electron. 2011, vol. 54, no. 12, pp. 796–804. DOI: 10.1007/s11141-012-9341-9. Ermakova E.N., Kotik D.S., Ryabov V.A., Bosinger T., Zhou K. Studying the variations of the broadband spectral maximum parameters in the natural ULF fields. Radiophys. Quantum Electron. 2012, vol. 55, no. 10-11, pp. 605–615. DOI: 10.1007/s11141-013-9398-0. Ermakova E.N., Kotik D.S., Ryabov V.A., Bosinger T., Zhou K. Studying the variations of the broadband spectral maximum parameters in the natural ULF fields. Radiophys. Quantum Electron. 2012, vol. 55, no. 10-11, pp. 605–615. DOI: 10.1007/s11141-013-9398-0. Ermakova E.N., Kotik D.S., Ryabov A.V., Panyutin A.A. Studying the effect of the local thunderstorm cells on the background ULF magnetic noise parameter spectra. Radiophys. Quantum Electron. 2014, vol. 57, no. 11, pp. 782–794. DOI: 10.1007/s11141-015-9564-7. Ermakova E.N., Kotik D.S., Ryabov A.V., Panyutin A.A. Studying the effect of the local thunderstorm cells on the background ULF magnetic noise parameter spectra. Radiophys. Quantum Electron. 2014, vol. 57, no. 11, pp. 782–794. DOI: 10.1007/s11141-015-9564-7. Greenberg E., Price C. Diurnal variations of ELF transients and background noise in the Schumann resonance band. Radio Sci. 2007, vol. 42, RS2S08, pp. 1–14. DOI: 10.1029/ 2006RS003477. Greenberg E., Price C. Diurnal variations of ELF transients and background noise in the Schumann resonance band. Radio Sci. 2007, vol. 42, RS2S08, pp. 1–14. DOI: 10.1029/ 2006RS003477. Kirillov V.V., Kopeykin V.N. Solving a two-dimensional telegraph equation with anisotropic parameters. Radiophys. Quantum Electron. 2002, vol. 45, no. 12, pp. 929–941. DOI: 10.1023/A:1023525331531. Kirillov V.V., Kopeykin V.N. Solving a two-dimensional telegraph equation with anisotropic parameters. Radiophys. Quantum Electron. 2002, vol. 45, no. 12, pp. 929–941. DOI: 10.1023/A:1023525331531. Kirillov V.V., Kopeykin V.N. Formation of a resonance structure of the local inductance of the ionosphere at frequencies 0.1–10 Hz. Radiophys. Quantum Electron. 2003, vol. 46, no. 1, pp. 1–12. DOI: 10.1023/A:1023652610575. Kirillov V.V., Kopeykin V.N. Formation of a resonance structure of the local inductance of the ionosphere at frequencies 0.1–10 Hz. Radiophys. Quantum Electron. 2003, vol. 46, no. 1, pp. 1–12. DOI: 10.1023/A:1023652610575. Koloskov A.V., Bezrodny V.G., Budanov O.V., Paznukhov A.V., Yampolsky Yu.M. Polarization monitoring of Schumann resonances in Antarctica and restoration of the characteristics of global thunderstorm activity. Radiofizika i radioastronomiya. [Radiophysics and Radioastronomy]. 2005, vol. 10, no. 1, pp. 11–29. (In Russian). Koloskov A.V., Bezrodny V.G., Budanov O.V., Paznukhov A.V., Yampolsky Yu.M. Polarization monitoring of Schumann resonances in Antarctica and restoration of the characteristics of global thunderstorm activity. Radiofizika i radioastronomiya. [Radiophysics and Radioastronomy]. 2005, vol. 10, no. 1, pp. 11–29. (In Russian). Nickolaenko A.P., Rabinowicz L.M. Study of the annual changes of global lightning distribution and frequency variations of the first Schumann resonance mode. J. Atmos. Solar-Terr. Phys. 1995, vol. 57, no. 11, pp. 1345–1348. DOI: 10.1016/0021-9169(94)00114-4. Nickolaenko A.P., Rabinowicz L.M. Study of the annual changes of global lightning distribution and frequency variations of the first Schumann resonance mode. J. Atmos. Solar-Terr. Phys. 1995, vol. 57, no. 11, pp. 1345–1348. DOI: 10.1016/0021-9169(94)00114-4. Nickolaenko A.P., Satori G., Zieger B., Rabiniwicz L.M., Kudintseva I.G. Parameters of global thunderstorm activity deduced from long-term Schumann resonance records. J. Atmos. Solar-Terr. Phys. 1998. vol. 60, no. 3, pp. 887–399. DOI: 10.1016/S1364-6826(97)00121-1. Nickolaenko A.P., Satori G., Zieger B., Rabiniwicz L.M., Kudintseva I.G. Parameters of global thunderstorm activity deduced from long-term Schumann resonance records. J. Atmos. Solar-Terr. Phys. 1998. vol. 60, no. 3, pp. 887–399. DOI: 10.1016/S1364-6826(97)00121-1. Ogawa T., Tanaka Y., Yasuhara M. Schumann resonances and world-wide thunderstorm activity—diurnal variations of the resonant power of natural noises in the earth-ionosphere cavity. J. Geophys. Res. 1969, vol. 21, no. 1, pp. 447–452. Ogawa T., Tanaka Y., Yasuhara M. Schumann resonances and world-wide thunderstorm activity—diurnal variations of the resonant power of natural noises in the earth-ionosphere cavity. J. Geophys. Res. 1969, vol. 21, no. 1, pp. 447–452. Polyakov S.V., Rapoport V.O. Ionospheric Alfven resonator. Geomagnetizm i aeronomiya [Geomagnetism and Aeronomy]. 1981, vol. 21, no. 5, pp. 816–822. (In Russian). Polyakov S.V., Rapoport V.O. Ionospheric Alfven resonator. Geomagnetizm i aeronomiya [Geomagnetism and Aeronomy]. 1981, vol. 21, no. 5, pp. 816–822. (In Russian). Potapov A., Polyushkina T.N., Tsegmed B. Morphology and diagnostic potential of the ionospheric Alfvén resonator. Solar-Terrestrial Phys. 2021, vol. 7, no. 3, pp. 39–56. DOI: 10.12737/stp-73202104. Potapov A., Polyushkina T.N., Tsegmed B. Morphology and diagnostic potential of the ionospheric Alfvén resonator. Solar-Terrestrial Phys. 2021, vol. 7, no. 3, pp. 39–56. DOI: 10.12737/stp-73202104. Price C., Melnikov A. Diurnal, seasonal and inter-annual variations in the Schumann resonance parameters. J. Atmos. Solar-Terr. Phys. 2004, vol. 66, no. 13-14, pp. 1179–1185. DOI: 10.1016/j.jastp.2004.05.004. Price C., Melnikov A. Diurnal, seasonal and inter-annual variations in the Schumann resonance parameters. J. Atmos. Solar-Terr. Phys. 2004, vol. 66, no. 13-14, pp. 1179–1185. DOI: 10.1016/j.jastp.2004.05.004. Roldugin V.K., Vasiliev A.N. Variations in the parameters of the Schumann resonance polarization ellipse in the horizontal and vertical planes according to observations at the Barentsburg and Lovozero observatories. Geomagnetizm i aeronomiya [Geomagnetism and Aeronomy]. 2012, vol.52, no.1, pp. 73-81. (In Russian). Roldugin V.K., Vasiliev A.N. Variations in the parameters of the Schumann resonance polarization ellipse in the horizontal and vertical planes according to observations at the Barentsburg and Lovozero observatories. Geomagnetizm i aeronomiya [Geomagnetism and Aeronomy]. 2012, vol.52, no.1, pp. 73-81. (In Russian). Roldugin V.C., Maltsev Y.P., Vasiljev A.N., Schokotov A.Y., Belyajev G.G. Diurnal variations of Schumann resonance frequency in NS and EW magnetic components. J. Geophys. Res. 2004, vol. 109, A08304, pp. 1–4. DOI: 10.1029/2004JA010487. Roldugin V.C., Maltsev Y.P., Vasiljev A.N., Schokotov A.Y., Belyajev G.G. Diurnal variations of Schumann resonance frequency in NS and EW magnetic components. J. Geophys. Res. 2004, vol. 109, A08304, pp. 1–4. DOI: 10.1029/2004JA010487. Rusakov N.N., Bakastov S.S. Rotation of the horizontal projection of the magnetic field disturbance vector at Schumann resonance frequencies. Geomagnetizm i aeronomiya [Geomagnetism and Aeronomy]. 1988, vol. 28, no. 6, pp. 919–922. (In Russian). Rusakov N.N., Bakastov S.S. Rotation of the horizontal projection of the magnetic field disturbance vector at Schumann resonance frequencies. Geomagnetizm i aeronomiya [Geomagnetism and Aeronomy]. 1988, vol. 28, no. 6, pp. 919–922. (In Russian). Satori G., Zieger B. Spectral characteristics of Schumann resonances observed in Central Europe. J. Geophys. Res. 1996, vol. 101, no. D23, pp. 29663–29669. DOI: 10.1029/96JD00549. Satori G., Zieger B. Spectral characteristics of Schumann resonances observed in Central Europe. J. Geophys. Res. 1996, vol. 101, no. D23, pp. 29663–29669. DOI: 10.1029/96JD00549. Schlegel K., Fullekrug M. Diurnal harmonics in Schumann resonance parameters observed on both hemispheres. Geophys. Res. Lett. 2000, vol. 27, no. 17, pp. 2805–2808. DOI: 10.1029/2000GL003774. Schlegel K., Fullekrug M. Diurnal harmonics in Schumann resonance parameters observed on both hemispheres. Geophys. Res. Lett. 2000, vol. 27, no. 17, pp. 2805–2808. DOI: 10.1029/2000GL003774. Sentman D.D. Magnetic elliptical polarization of Schumann resonances. Radio Sci. 1987, vol. 22, no. 4, pp. 595–606. DOI: 10.1029/RS022i004p00595. Sentman D.D. Magnetic elliptical polarization of Schumann resonances. Radio Sci. 1987, vol. 22, no. 4, pp. 595–606. DOI: 10.1029/RS022i004p00595.