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Features of Variations in the F2-Layer Critical Frequency During the Sudden Stratospheric Warnings of 1966–2009 According to Data from Kaliningrad and Irkutsk Stations

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Abstract

A study of the wave changeability in the F2-layer critical frequency over Kaliningrad (54.6° N, 20° E) and Irkutsk (53° N, 103° E) stations during strong sudden stratospheric warmings is presented. Low solar activity was a common factor for all selected cases. The results of wavelet analysis of the time variations in foF2 showed that an amplification of the oscillations with periods of 4–10 days occurred in the majority of the warmings within a period of 1965–2009. The amplitude of long-period (25–30 days) oscillations, vice versa, decreased. A similar analysis performed for the 1975–1976 winter, during which there were no warmings, showed that the amplitudes of the foF2 oscillations with periods of 25–30 days, conversely, were very stable and changed insignificantly. The amplification of the variability in the foF2 oscillation spectrum in other frequency ranges also is another manifestation of stratospheric warmings over Kaliningrad and Irkutsk.

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5. ACKNOWLEDGMENTS

The authors thank the National Center of Environment Prediction/National Center of Atmospheric Research (NCEP/NCAR) for the temperature data and to World Data Center on Geomagnetism in Kyoto for the geomagnetic indices from the site http://wdc.kugi.kyoto-u.ac.jp/.

Funding

The work was supported by the Russian Foundation for Basic Research (project no. 18-05-00594). The experimental data of the Angara Center for Common Use (http://ckp-rf.ru/ckp/3056/), which were obtained in the scope of the basic financing of the FNI II.12 program, were used in the paper.

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Authors and Affiliations

  1. I. Kant Baltic Federal University, Kaliningrad, Russia

    A. V. Timchenko, F. S. Bessarab & O. P. Borchevkina

  2. Kaliningrad Branch, N.V. Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Kaliningrad, Russia

    A. V. Timchenko, F. S. Bessarab, Yu. N. Koren’kov, N. A. Koren’kova & O. P. Borchevkina

  3. Institute of Solar–Terrestrial Physics, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia

    K. G. Ratovsky

Authors
  1. A. V. Timchenko
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  2. F. S. Bessarab
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  3. Yu. N. Koren’kov
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  4. N. A. Koren’kova
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  5. O. P. Borchevkina
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  6. K. G. Ratovsky
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Correspondence to A. V. Timchenko.

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Translated by A. Danilov

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Timchenko, A.V., Bessarab, F.S., Koren’kov, Y.N. et al. Features of Variations in the F2-Layer Critical Frequency During the Sudden Stratospheric Warnings of 1966–2009 According to Data from Kaliningrad and Irkutsk Stations. Geomagn. Aeron. 61, 100–107 (2021). https://doi.org/10.1134/S0016793221010151

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  • DOI: https://doi.org/10.1134/S0016793221010151

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