Evidence of anti-correlation between sporadic (Es) layers occurrence and solar activity observed at low latitudes over the Brazilian sector

Fontes Neto, Pedro Alves; Muella, Marcio Tadeu de Assis Honorato; Resende, Laysa Cristina Araújo; Fagundes, Paulo Roberto

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Evidence of anti-correlation between sporadic (Es) layers occurrence and solar activity observed at low latitudes over the Brazilian sector

dc.contributor.author	Fontes Neto, Pedro Alves
dc.contributor.author	Muella, Marcio Tadeu de Assis Honorato
dc.contributor.author	Resende, Laysa Cristina Araújo
dc.contributor.author	Fagundes, Paulo Roberto
dc.date.accessioned	2025-02-06T17:24:47Z
dc.date.available	2025-02-06T17:24:47Z
dc.date.issued2	2024
dc.description.abstract	Sporadic E-layers (Es) are thin and denser layers with high ionization observed at about 100–140 km altitude in the E region. Their formation is mainly associated with the tidal components of the diurnal and semidiurnal winds with the convergence of ions driven by the wind shear mechanism. This present work shows evidence of the relationship between the occurrence of Es layers and the solar activity at two observatories located in the Brazilian sector, the near-equatorial site of Palmas (PAL, 10.17 S; 48.33 W; dip lat. 7.31 ) and the low latitude station of Sa ̃o Jose ́ dos Campos (SJC, 23.18 S; 45.89 W; dip lat. 19.35 ). The analysis was performed from Decem- ber/2008 to November/2009 (a period of low solar activity) and from December/2013 to November/2014 (a period of high solar activity) using data collected from two digital ionosondes. Our results show an anti-correlation of the Es layer occurrence concerning the solar activity over both stations studied here. A more clearly observed anti-correlation at the SJC station can be attributed to a greater tidal amplitude at low latitudes. Other relevant aspects of the observations associated with the formation of the Es layers are highlighted and discussed.
dc.description.physical	15 p.
dc.description.sponsorship	Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorship	Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.uri	CAPES (88887.372542/2019-00) CNPQ (314261/2020-6)
dc.format.mimetype	PDF
dc.identifier.affiliation	Universidade do Vale do Paraíba
dc.identifier.affiliation	Instituto Federal do Maranhão
dc.identifier.affiliation	State Key Laboratory of Space Weather
dc.identifier.affiliation	Instituto Nacional de Pesquisas Espaciais
dc.identifier.bibliographicCitation	Fontes Neto, Pedro Alves et al. Evidence of anti-correlation between sporadic (Es) layers occurrence and solar activity observed at low latitudes over the Brazilian sector. Advances in Space Research, v. 73, n. 7, p. 3563–3577, 2024. Disponível em: https://linkinghub.elsevier.com/retrieve/pii/S0273117723007627.
dc.identifier.doi	10.1016/j.asr.2023.09.040
dc.identifier.uri	https://repositorio.univap.br/handle/123456789/554
dc.language.iso	en_US
dc.publisher	Elsevier
dc.rights.holder	Pedro Alves Fontes Neto
dc.rights.holder	Marcio Tadeu de Assis Honorato Muella
dc.subject.keyword	Sporadic (Es) layer
dc.subject.keyword	Solar activity
dc.subject.keyword	Ionosphere
dc.title	Evidence of anti-correlation between sporadic (Es) layers occurrence and solar activity observed at low latitudes over the Brazilian sector
dc.type	Artigos de Periódicos