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Spatial and temporal evolution of different-scale ionospheric irregularities in central and East Siberia during the 27–28 May 2017 geomagnetic storm

Spatial and temporal evolution of different-scale ionospheric irregularities in central and East Siberia during the 27–28 May 2017 geomagnetic storm
Spatial and temporal evolution of different-scale ionospheric irregularities in central and East Siberia during the 27–28 May 2017 geomagnetic storm

We present a multi-instrumental study of ionospheric irregularities of different scales (from tens of centimeters to few kilometers) observed over the Central and East Siberia, Russia, during a moderate-to-strong geomagnetic storm on 27–28 May 2017. From high-frequency (HF) and ultrahigh-frequency (UHF) radar data, we observed an intense auroral backscatter developed right after the initial phase of the geomagnetic storm. Additionally, we examined variations of Global Positioning System (GPS)-based ROT (rate of TEC changes, where TEC is total electron content) for available GPS receivers in the region. Ionosondes, HF, and UHF radar data exhibited a presence of intense multi-scale ionospheric irregularities. We revealed a correlation between different-scale Auroral/Farley-Buneman ionospheric irregularities of the E layer during the geomagnetic storm. The combined analysis showed that an area of intense irregularities is well connected and located slightly equatorward to field-aligned currents (FACs) and auroral oval at different stages of the geomagnetic storm. An increase and equatorward displacement of Region 1 (R1)/Region 2 (R2) FACs leads to appearance and equatorward expansion of ionospheric irregularities. During downward (upward) R1 FAC and upward (downward) R2 FAC, the eastward and upward (westward and downward) E × B drift of ionospheric irregularities occurred. Simultaneous disappearance of UHF/HF auroral backscatter and GPS ROT decrease occurred during a prolonged near noon reversal of R1 and R2 FAC directions that accompanied by R1/R2 FAC degradation and disappearance of high-energy auroral precipitation.

E layer, field-aligned currents, field-aligned irregularities, HF absorption, radar auroral backscatter, rate of TEC change
Ovodenko, V. B.
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Klimenko, M. V.
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Zakharenkova, I. E.
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Oinats, A. V.
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Kotova, D. S.
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Nikolaev, A. V.
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Tyutin, I. V.
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Rogov, D. D.
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Ratovsky, K. G.
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Chugunin, D. V.
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Budnikov, P. A.
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Coxon, J. C.
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Anderson, B. J.
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Chernyshov, A. A.
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Ovodenko, V. B.
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Klimenko, M. V.
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Zakharenkova, I. E.
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Oinats, A. V.
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Kotova, D. S.
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Nikolaev, A. V.
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Tyutin, I. V.
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Rogov, D. D.
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Ratovsky, K. G.
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Chugunin, D. V.
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Budnikov, P. A.
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Coxon, J. C.
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Anderson, B. J.
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Chernyshov, A. A.
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Ovodenko, V. B., Klimenko, M. V., Zakharenkova, I. E., Oinats, A. V., Kotova, D. S., Nikolaev, A. V., Tyutin, I. V., Rogov, D. D., Ratovsky, K. G., Chugunin, D. V., Budnikov, P. A., Coxon, J. C., Anderson, B. J. and Chernyshov, A. A. (2020) Spatial and temporal evolution of different-scale ionospheric irregularities in central and East Siberia during the 27–28 May 2017 geomagnetic storm. Space Weather, 18 (6), [e2019SW002378]. (doi:10.1029/2019SW002378).

Record type: Article

Abstract

We present a multi-instrumental study of ionospheric irregularities of different scales (from tens of centimeters to few kilometers) observed over the Central and East Siberia, Russia, during a moderate-to-strong geomagnetic storm on 27–28 May 2017. From high-frequency (HF) and ultrahigh-frequency (UHF) radar data, we observed an intense auroral backscatter developed right after the initial phase of the geomagnetic storm. Additionally, we examined variations of Global Positioning System (GPS)-based ROT (rate of TEC changes, where TEC is total electron content) for available GPS receivers in the region. Ionosondes, HF, and UHF radar data exhibited a presence of intense multi-scale ionospheric irregularities. We revealed a correlation between different-scale Auroral/Farley-Buneman ionospheric irregularities of the E layer during the geomagnetic storm. The combined analysis showed that an area of intense irregularities is well connected and located slightly equatorward to field-aligned currents (FACs) and auroral oval at different stages of the geomagnetic storm. An increase and equatorward displacement of Region 1 (R1)/Region 2 (R2) FACs leads to appearance and equatorward expansion of ionospheric irregularities. During downward (upward) R1 FAC and upward (downward) R2 FAC, the eastward and upward (westward and downward) E × B drift of ionospheric irregularities occurred. Simultaneous disappearance of UHF/HF auroral backscatter and GPS ROT decrease occurred during a prolonged near noon reversal of R1 and R2 FAC directions that accompanied by R1/R2 FAC degradation and disappearance of high-energy auroral precipitation.

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More information

Accepted/In Press date: 13 May 2020
e-pub ahead of print date: 19 May 2020
Published date: 1 June 2020
Keywords: E layer, field-aligned currents, field-aligned irregularities, HF absorption, radar auroral backscatter, rate of TEC change

Identifiers

Local EPrints ID: 444402
URI: http://eprints.soton.ac.uk/id/eprint/444402
PURE UUID: 3ccaf6ed-4648-4a59-8e0d-4a216c5d13f5
ORCID for J. C. Coxon: ORCID iD orcid.org/0000-0002-0166-6854

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Date deposited: 16 Oct 2020 16:32
Last modified: 16 Oct 2020 16:32

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Contributors

Author: V. B. Ovodenko
Author: M. V. Klimenko
Author: I. E. Zakharenkova
Author: A. V. Oinats
Author: D. S. Kotova
Author: A. V. Nikolaev
Author: I. V. Tyutin
Author: D. D. Rogov
Author: K. G. Ratovsky
Author: D. V. Chugunin
Author: P. A. Budnikov
Author: J. C. Coxon ORCID iD
Author: B. J. Anderson
Author: A. A. Chernyshov

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