Global ionospheric response to a G2 and a G3 geomagnetic storms of November 4 and 5 2023

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dc.contributor.authorAgyei-Yeboah, Ebenezer
dc.contributor.authorFagundes, Paulo Roberto
dc.contributor.authorTardelli, Alexandre
dc.contributor.authorPillat, Valdir Gil
dc.contributor.authorVieira, Francisco
dc.contributor.authorBolzan, Mauricio José Alvez
dc.date.accessioned2025-08-15T19:22:22Z
dc.date.available2025-08-15T19:22:22Z
dc.date.issued22025
dc.description.abstractTwo successive geomagnetic storms of G2 and G3 intensities were observed on November 4, 2023, and November 5, 2023. The results presented in this study investigated the impacts of two geomagnetic storms during the main phases at equatorial, low-latitude, and EIA and beyond over west/east American, west/east African/European, and west/east Asian longitudinal sectors. This study was carried out using 30 GPS receivers, 30 magnetometers, and three ionosondes (East Brazilian sector). Positive storm effects were observed during the main phases of both the G2 (storm1) and G3 (storm2) storms, however the magnitude of the positive storm effects was greater during the G3 main phase than during the G2 main phase. The American sectors recorded the highest VTEC variations. Negative storm effects were mostly observed over the Asian sectors. Minimal changes in VTEC were observed in the Asian sectors during both main phases, except over DAEJ. The American sectors exhibited the strongest positive storm responses, followed by the African and Asian sectors, with VTEC enhancements being more pronounced during the G3 storm’s main phase compared G2 storm. Positive ionospheric effects extended to higher latitudes during the main phase of G3 storm especially in the American sectors, likely due to eastward prompt pen- etration electric fields (PPEF) uplifting the F-region to altitudes where lower recombination rates lead to VTEC enhancement. This PPEF effect varied with longitude and storm intensity, resulting in significant positive ionospheric responses in the American sector, par- ticularly during the G3 storm. Variations in the thermospheric O/N2 ratio further influenced the VTEC changes across all sectors. The EIA exhibited notable disturbances, particularly in the American sector. By contrast, EIA crest features were less distinct in the African sector, highlighting the longitudinal dependencies of PPEF effects on the EIA structure. The EIA features were more pronounced during the main phase of the first storm, whereas during the second, the crests appeared to merge into one structure extending beyond the typical crest regions. The foF2 obtained from ionogram also increased during the main phases in the American sector with no significant h’F variations. The DH showed marked depressions, particularly in the American and African sectors, with the G3 storm producing stronger DH depressions than the G2 storm. Similar longitudinal and latitudinal DH variations were observed across both events, with substantial decreases in DH over specific stations, such as ABG and JAI, in the West Asian sector.
dc.description.physical23 p.
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.uriFAPESP (2022/14815-5) CAPES (88887.923851/2023-00) CNPq (402724/2023-2 and 304721/2021-2)
dc.format.mimetypePDF
dc.identifier.affiliationUniversidade do Vale do Paraíba
dc.identifier.affiliationInstituto Federal de Tocantins
dc.identifier.affiliationUniversidade Federal de Jataı
dc.identifier.bibliographicCitationAGYEI-YEBOAH, Ebenezer et al. Global ionospheric response to a G2 and a G3 geomagnetic storms of November 4 and 5 2023. Advances in Space Research, v. 75, n. 7, p. 5580-5602, 2025. Disponível em: 10.1016/j.asr.2025.01.046.
dc.identifier.doi10.1016/j.asr.2025.01.046
dc.identifier.urihttps://repositorio.univap.br/handle/123456789/1023
dc.language.isoen_US
dc.publisherElsevier
dc.rights.holderAdvances in Space Research
dc.subject.keywordIonospheric response
dc.subject.keywordStorm effects
dc.subject.keywordMagnetic field variations
dc.titleGlobal ionospheric response to a G2 and a G3 geomagnetic storms of November 4 and 5 2023
dc.typeArtigos de Periódicos

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