edu.ucar.opensky::articles:25059 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-25T15:07:45.389182 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d73t9mr2 Spatial and temporal evolution of different-scale ionospheric irregularities in central and east Siberia during the 27–28 may 2017 geomagnetic storm 2020-06-13T00:00:00Z publication https://n2t.org/ark:/85065/d73t9mr2 https://doi.org/10.1029/2019SW002378 Ovodenko, V. B. author Klimenko, M. V. author Zakharenkova, Irina author Oinats, A. V. author Kotova, D. S. author Nikolaev, A. V. author Tyutin, I. V. author Rogov, D. D. author Ratovsky, K. G. author Chugunin, D. V. author Budnikov, P. A. author Coxon, J. C. author Anderson, B. J. author Chernyshov, A. A. author UCAR/NCAR - Library publisher 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 x 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. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication 2020 The Authors. This is an open access article under the terms of the Creative CommonsAttribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. None eng geoscientificInformation