Ukrainian Antarctic Journal

Vol 21 No 2(27) (2023): Ukrainian Antarctic Journal
Articles

Long-distance HF radio waves propagation during the April 2023 geomagnetic storm by measurements in Antarctica, in Europe, and aboard RV Noosfera

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  • A. Zalizovski,
  • Y. Yampolski,
  • I. Stanislawska,
  • O. Koloskov,
  • O. Budanov,
  • O. Bogomaz,
  • B. Gavrylyuk,
  • A. Sopin,
  • A. Reznychenko,
  • A. Kashcheyev,
  • S. Kashcheyev,
  • V. Lisachenko
A. Zalizovski
State Institution National Antarctic Scientific Center, Ministry of Education and Science of Ukraine, 01601, Kyiv, Ukraine; Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 61002, Kharkiv, Ukraine; Space Research Centre of Polish Academy of Sciences, 00-716, Warsaw, Poland
Y. Yampolski
Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 61002, Kharkiv, Ukraine
I. Stanislawska
Space Research Centre of Polish Academy of Sciences, 00-716, Warsaw, Poland
O. Koloskov
State Institution National Antarctic Scientific Center, Ministry of Education and Science of Ukraine, 01601, Kyiv, Ukraine; Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 61002, Kharkiv, Ukraine; Department of Physics, University of New Brunswick, Fredericton, NB E3B5A3, Canada
O. Budanov
Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 61002, Kharkiv, Ukraine
O. Bogomaz
Institute of Ionosphere, National Academy of Sciences of Ukraine and Ministry of Education and Science of Ukraine, 61001, Kharkiv, Ukraine
B. Gavrylyuk
State Institution National Antarctic Scientific Center, Ministry of Education and Science of Ukraine, 01601, Kyiv, Ukraine; Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 61002, Kharkiv, Ukraine
A. Sopin
State Institution National Antarctic Scientific Center, Ministry of Education and Science of Ukraine, 01601, Kyiv, Ukraine; Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 61002, Kharkiv, Ukraine
A. Reznychenko
Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 61002, Kharkiv, Ukraine; Space Research Centre of Polish Academy of Sciences, 00-716, Warsaw, Poland
A. Kashcheyev
Department of Physics, University of New Brunswick, Fredericton, NB E3B5A3, Canada
S. Kashcheyev
Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 61002, Kharkiv, Ukraine
V. Lisachenko
Institute of Radio Astronomy, National Academy of Sciences of Ukraine, 61002, Kharkiv, Ukraine
Spectrograms of the signal emitted from Vernadsky and received onboard RV Noosfera after reflection from the ionosphere, the black line shows the X component of the geomagnetic field measured at the Vernadsky AIA station. See paper Zalizovski et al. 2024 (page 195). Photo by S. Glotov and from the archive of the SI NASC
DOI: https://doi.org/10.33275/1727-7485.2.2023.717
Published December 31, 2023
Keywords
  • Doppler HF receiver,
  • ionosonde,
  • geomagnetic field,
  • ionosphere
How to Cite
Zalizovski, A., Yampolski, Y., Stanislawska, I., Koloskov, O., Budanov, O., Bogomaz, O., Gavrylyuk, B., Sopin, A., Reznychenko, A., Kashcheyev, A., Kashcheyev, S., & Lisachenko, V. (2023). Long-distance HF radio waves propagation during the April 2023 geomagnetic storm by measurements in Antarctica, in Europe, and aboard RV Noosfera. Ukrainian Antarctic Journal, 21(2(27), 190-209. https://doi.org/10.33275/1727-7485.2.2023.717

Copyright (c) 2023 Ukrainian Antarctic Journal

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Abstract

The paper aims at an experimental study of the mechanisms of long-distance high-frequency (HF) propagation and spatial and temporal variations of the ionospheric parameters during the first hours of a severe geomagnetic storm of April 23, 2023 by spatially separated measuring equipment located at the research vessel (RV) Noosfera, the Ukrainian Antarctic Akademik Vernadsky station (hereinafter Vernadsky), and the LOFAR observatory PL610 in Borowiec (Poland). High-frequency vertical and oblique sounding techniques of the ionosphere were used. Geospace measurements were carried out synchronously. During the first hours of the geomagnetic storm of April 23–24, 2023, unexpectedly well-correlated variations in the Doppler frequency shifts of HF signals emitted from Vernadsky were observed at the RV Noosfera and the PL610 station. Furthermore, variations in Doppler frequency shifts of HF signals strongly correlate with magnetic field records in Antarctica and Poland. Variations in the frequency of HF signal spectral components, distinguishable during storm conditions, are utilized to clarify the mechanism of long-distance HF propagation and estimate the vertical velocity of ionospheric layers. Signals of HF CHU time radio station (Canada) at 7850 and 14670 kHz were unexpectedly observed in all receiving sites. Most probably, the CHU station radio signals registered during the initial stage of the geomagnetic storm were scattered on the polar ovals’ ionospheric inhomogeneities and propagated further along the return (long arc of the great circle) paths. Redistribution of the ionospheric plasma during the geomagnetic storm leads to the formation of HF radio propagation channels absent under quiet conditions.

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