Effects of the Northern Hemisphere sudden stratospheric warmings on the Sporadic-E layers in the Brazilian sector

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dc.contributor.authorFontes Neto, Pedro Alves
dc.contributor.authorMuella, Tadeu de Assis Honorato
dc.contributor.authorResende, Laysa Cristina Araújo
dc.contributor.authorJesus, Rodolfo de
dc.contributor.authorFagundes, Paulo Roberto
dc.contributor.authorBatista, Paulo Prado
dc.contributor.authorPillat, Valdir Gil
dc.contributor.authorTardelli, Alexandre
dc.contributor.authorAndrioli, Vania F.
dc.date.accessioned2025-02-07T12:51:29Z
dc.date.available2025-02-06T14:44:12Z
dc.date.available2025-02-07T12:51:29Z
dc.date.issued22024
dc.description.abstractTidal and Planetary Wave (PWs) amplitudes are strongly influenced by Sudden Stratospheric Warming (SSW) events. A nonlinear interaction between the tidal winds and planetary waves during the SSW may contribute to the intensification of sporadic-E (Es) layers in the lower thermosphere. This work investigated the relationship between SSW events in the Northern Hemisphere and the Es layer occurrence at low latitudes in the Brazilian sector. We used data from digital ionosondes installed in the observatories of Araguatins (ARA, 5.65◦ S; 48.12◦ W; dip lat. − 5.44◦) and S ̃ao Jos ́e dos Campos (SJC, 23.18◦ S; 45.89◦ W; dip lat. − 21.37◦) to analyze the Es layers. Additionally, we used the temperature, zonal wind, and PWs data at high latitudes in the Northern Hemisphere during the major SSW event that occurred in February/2018 and during the events of Dec/2018–Jan/2019 and Dec/2020–Jan/2021. The results showed a maximum frequency peak of 20 MHz (~5 × 106 electrons.cm− 3) at ARA and SJC during these SSW events. The large values of ftEs, fbEs, and electronic densities were observed between 100 and 115 km height in the Esf/l type layers during daytime or nighttime periods. The results also showed that the number of large values of ftEs, fbEs, and electronic density of the Es layer was much higher in ARA than in SJC, in general. The wavelet power spectrum analyses of the ftEs and fbEs showed a periodicity of 2- days before and after the central day of the SSWs events at the station of ARA, with three prominent peaks in the 2018/2019 event. At the SJC station the quasi-2-day periodicity in the wavelet analyses of the ftEs was observed after the central day in all three SSW events, with a peak before the central day during the 2020/2021 event.
dc.description.physical15 p.
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.uriCAPES (88887.372542/2019-00, 88882.317521/2019-01) CNPQ (314261/2020-6)
dc.format.mimetypePDF
dc.identifier.affiliationUniversidade do Vale do Paraíba
dc.identifier.affiliationInstituto Federal do Maranhão
dc.identifier.affiliationInstituto Nacional de Pesquisas Espaciais - INPE
dc.identifier.affiliationState Key Laboratory of Space Weather
dc.identifier.bibliographicCitationFONTES NETO, Pedro Alves et al. Effects of the Northern Hemisphere sudden stratospheric warmings on the Sporadic-E layers in the Brazilian sector. Journal of Atmospheric and Solar-Terrestrial Physics, v. 256, p. 1-15, 2024. Disponível em: https://linkinghub.elsevier.com/retrieve/pii/S1364682624000270.
dc.identifier.doi10.1016/j.jastp.2024.106199
dc.identifier.urihttps://repositorio.univap.br/handle/123456789/552.2
dc.language.isoen_US
dc.publisherElsevier
dc.rights.holderElsevier
dc.subject.keywordSudden stratospheric warming
dc.subject.keywordTidal winds
dc.subject.keywordSporadic-E layer
dc.subject.keywordQ2DWs periodicity
dc.titleEffects of the Northern Hemisphere sudden stratospheric warmings on the Sporadic-E layers in the Brazilian sector
dc.typeArtigos de Periódicos

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