Latitudinal dependence of quasi-periodic variations in the geomagnetic field during the greatest geospace storm of September 7-9, 2017
Heading:
| 1Chernogor, LF, 1Shevelev, MB 1V.N. Karazin National University of Kharkiv, Kharkiv, Ukraine |
| Space Sci. & Technol. 2020, 26 ;(2):72-83 |
| https://doi.org/10.15407/knit2020.02.072 |
| Publication Language: Russian |
Abstract: Despite the Solar Cycle 24 minimum in the vicinity, September in 2017 was characterized by high astral activity, when 40 C-class, 15 M-class, and 4 X-class flares occurred. Huge coronal mass ejection events and strong geospace storms, sets of magnetic, ionospheric, and atmospheric storms as well as electric field disturbances, were reported. The purpose of this paper is to present the results of analysis of global-scale quasi-periodic variations in the geomagnetic field during the unique geospace storm that occurred on September 7—9, 2017. To analyze the time variations, the data acquired at the 0.1-nT resolution and the 1-min sampling interval from the Intermagnet magnetometer network at the Tamanrasset (22.79°N, 5.53°E), Duronia (41.35°N, 14.466°E), Lonjsko Polje (45.408°N, 16.659°E), Belsk (51.84°N, 20.79°E), Uppsala (59.903°N, 17.353°E), Abisko (68.358°N, 18.823°E) observatories have been used. The local time variations in the horizontal field components that occurred on September 7—9, 2017 have been analyzed. Band-pass filtering and the system spectral analysis have been performed in the 2–120-min per cycle period range, when the mutually complementary short-time Fourier transform (SFT), the Fourier transform in a sliding window (FTS) with a width adjusted to be equal to a fixed number of harmonic periods, and the wavelet transform (WT) employing the Morlet wavelet as a basis function were used simultaneously.
T he latitudinal dependence of quasi-periodic disturbances in the horizontal components of the geomagnetic field during the unique geospace storm and on a reference day has been studied. The amplitude, spectral content, and the duration of the disturbances have been determined. The geospace storm has been shown to be accompanied by both the aperiodic and quasi-periodic disturbances in the geomagnetic field. The quasi-periodic variations occur in the 35–55- and 70–110-min per cycle period range. The quasi-periodicity strengthens as the geographic latitude of the magnetic observatory decreases. When the geographic latitude increases from ~20° to ~70°, the amplitude of the disturbances increases from 20 to 1500 nT. The duration of the oscillation trains averages fr om a few ones to ~16 hours on September 8–9, 2017.
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| Keywords: aperiodic and quasi-periodic disturbances, latitudinal dependence of geomagnetic field variations, magnetic storm, quasi-periodic disturbance parameters, system spectral analysis |
References:
1. Astaf’eva N. M. (1996). Wavelet analysis: basic theory and some applications. Phys. Usp., 39, 1085—1108.
2. Pilipenko V. A., BelakhovskiyV. B., Sakharov Ya. A., Selivanov V. N. (2018). Magnetic storm on September 7—8, 2017 influence on electroenergetic system. RAS Kol’sk Scientific Centre Proceedings. Geliogeophysics, 4, 29—35 [in Russian].
3. Chernogor L. F. (2008). Advanced methods of spectral analysis of quasiperiodic wave-like processes in the ionosphere: Specific features and experimental results. Geomagnetism and Aeronomy, 48 (5), 652—673.
3. Chernogor L. F. (2008). Advanced methods of spectral analysis of quasiperiodic wave-like processes in the ionosphere: Specific features and experimental results. Geomagnetism and Aeronomy, 48 (5), 652—673.
4. Chernogor L. F., Domnin I. F. (2014). Physics of geocosmic storms. Kharkiv: V. N. Karazin Kharkiv National University Publ. [in Russian].
5. Chernogor L. F., Shevelev M. B. (2019). Geomagnetic Field Quasi-Periodic Variations During Severe Geospace Storm of September 6—10, 2017: Global Characteristics. Baikal Young Scientists’ International School on Fundamental Physics “Physical Processes in Outer and Near-Earth Space”. XVI Young Scientists’ Conference “Interaction of fields and radiation with matter”. Irkutsk, 16—21 September 2019.
5. Chernogor L. F., Shevelev M. B. (2019). Geomagnetic Field Quasi-Periodic Variations During Severe Geospace Storm of September 6—10, 2017: Global Characteristics. Baikal Young Scientists’ International School on Fundamental Physics “Physical Processes in Outer and Near-Earth Space”. XVI Young Scientists’ Conference “Interaction of fields and radiation with matter”. Irkutsk, 16—21 September 2019.
6. Aa E. (2018). Midlatitude Plasma Bubbles Over China and Adjacent Areas During a Magnetic Storm on 8 September 2017. Space Weather, 16, № 3, 321—331.
7. Gromova L. I., Kleimenova N. G., Gromov S. V. (2018). High-latitude daytime magnetic bays in the September 2017 strong magnetic storm. Proc. XLI Annual Seminar «Physics of Auroral Phenomena», Apatity, 14—17.
8. Kilifarska N., Tassev Y. (2018). Ozone profile response to the series of coronal mass ejections and severe geomagnetic storm in September 2017. Comptes Rendus de L’Academie Bulgare des Sciences, 71, № 5, 662—668.
8. Kilifarska N., Tassev Y. (2018). Ozone profile response to the series of coronal mass ejections and severe geomagnetic storm in September 2017. Comptes Rendus de L’Academie Bulgare des Sciences, 71, № 5, 662—668.
9. Lei J., Huang F., Chen X., Zhong J., Ren D., Wang W., Yue X., Luan X., Jia M., Dou X., Hu L., Ning B., Owolabi C., Chen J., Li G., Xue X. (2018). Was Magnetic Storm the Only Driver of the Long-Duration Enhancements of Daytime Total Electron Content in the Asian-Australian Sector Between 7 and 12 September 2017? J. Geophys. Res.: Space Physics, 123, № 4, 3217—3232.
10. Sidorov R., Soloviev A., Gvishiani A., Getmanov V., Mandea M., Petrukhin A., Yashin I. (2018). A combined analysis of geomagnetic data and cosmic ray secondaries in the September 2017 space weather phenomena studies. Ann. Geophys.
11. Sripathi S., Ram Singh. (2019). Response of the equatorial and low latitude ionosphere to September 2017 solar flares and their likely role in storm-time electrodynamics. 2019 URSI Asia Pacific Radio Science Conference. Mo-GO1-6.
12. Tassev Y., Velinov P. I. Y., Tomova D., Mateev L. (2017). Analysis of extreme solar activity in early September 2017: G4 — severe geomagnetic storm (07–08.09) and GLE72 (10.09) in solar minimum. Comptes rendus de l’Académie bulgare des sciences:
sciences mathématiques et naturelles, 70, № 10, 1437—1444.
13. Tomova D., Velinov P., Tassev Y. (2017). Comparison between extreme solar activity during periods March 15 – 17, 2015 and September 4—10, 2017 at different phases of solar cycle 24. Aerospace Research in Bulgaria, 29, 10—28.
12. Tassev Y., Velinov P. I. Y., Tomova D., Mateev L. (2017). Analysis of extreme solar activity in early September 2017: G4 — severe geomagnetic storm (07–08.09) and GLE72 (10.09) in solar minimum. Comptes rendus de l’Académie bulgare des sciences:
sciences mathématiques et naturelles, 70, № 10, 1437—1444.
13. Tomova D., Velinov P., Tassev Y. (2017). Comparison between extreme solar activity during periods March 15 – 17, 2015 and September 4—10, 2017 at different phases of solar cycle 24. Aerospace Research in Bulgaria, 29, 10—28.
14. Yamauchi M., Sergienko T., Enell C. F., Schillings A., Slapak R., Johnsen M. G., Tjulin A., Nilsson H. (2018). Ionospheric Response Observed by EISCAT During the 6—8 September 2017 Space Weather Event: Overview. Space Weather, 16, № 9, 1437—1450.
15. Yuan L., Jin S., Calabia A. (2019). Distinct thermospheric mass density variations following the September 2017 geomagnetic storm from GRACE and Swarm. J. Atmospheric and Solar-Terrestrial Physics, 184, 30—36.