Occurrence of Ionospheric irregularities over Brazil and Africa during the 2019 Antarctic minor sudden stratospheric warming

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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.authorArcanjo, Mateus de Oliveira
dc.date.accessioned2025-02-26T17:08:37Z
dc.date.available2025-02-26T17:08:37Z
dc.date.issued22023
dc.description.abstractThe influence of sudden stratospheric warming (SSW) on the ionosphere and ionospheric irregularities has been studied extensively over the years. However, majority of these investigations have been conducted using warming events originating from the northern hemisphere. Only a few studies have been done on ionospheric variations due to the Antarctic SSW events and to the best of our knowledge, there have not been any studies on southern hemisphere SSW and the occurrence of ionospheric irregularities. In this study, the occurrence of ionospheric irregularities during the 2019 minor Southern hemisphere (SH)/Antarctic SSW is investigated. The event occurs in a relatively calm solar and geomagnetic activity period which makes it possible to identify the effects of SSW on the occurrence of irregularities. Three ionosondes located in different latitudinal regions in Brazil as well as a network of ground-based GPS receiver stations located in both Brazil and Africa were used for this undertaking. Complimentary data from the same ionosonde stations using the same months from 2017 and 2018 were also used. On average more Spread-F was observed in 2019 than in 2017 or 2018 at all stations. ROT observations showed more occurrence in the Brazil sectors followed by West Africa and thenEast Africa. It was observed that the occurrence frequency decreased between 8% and 46 % from the pre-SSW phase to ascending/peak phases and from 2018 to 2019 for the peak phase.
dc.description.physical23 p.
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.uriFAPESP (2019/09361-2) CNPq (302406/2017-4)
dc.format.mimetypePDF
dc.identifier.affiliationUniversidade do Vale do Paraíba
dc.identifier.bibliographicCitationAGYEI-YEBOAH, Ebenezer et al. Occurrence of Ionospheric irregularities over Brazil and Africa during the 2019 Antarctic minor sudden stratospheric warming. Advances in Space Research, v. 71, n. 1, p. 176-198, 2023. Disponível em: https://linkinghub.elsevier.com/retrieve/pii/S0273117722008018
dc.identifier.doi10.1016/j.asr.2022.08.065
dc.identifier.urihttps://repositorio.univap.br/handle/123456789/593
dc.language.isoen_US
dc.publisherElsevier
dc.rights.holderElsevier
dc.subject.keywordSudden stratospheric warming
dc.subject.keywordIonospheric irregularities
dc.subject.keywordAntarctic
dc.subject.keywordROT
dc.subject.keywordSpread-F
dc.titleOccurrence of Ionospheric irregularities over Brazil and Africa during the 2019 Antarctic minor sudden stratospheric warming
dc.typeArtigos de Periódicos

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