CIR-Driven Geomagnetic Storm and High-Intensity Long-Duration Continuous AE Activity (HILDCAA) Event: Effects on Brazilian Equatorial and Low-Latitude Ionosphere-Observations and Modeling

dc.contributor.authorAbaidoo, Samuel
dc.contributor.authorKlausner, Virginia
dc.contributor.authorCandido, Claudia Maria Nicoli
dc.contributor.authorPillat, Valdir Gil
dc.contributor.authorGodoy, Stella Pires de Moraes Santos Ribeiro
dc.contributor.authorGuedes, Fabio Becker
dc.contributor.authorToledo, Josiely Aparecida do Espirito Santo
dc.contributor.authorTrigo, Laura Luiz
dc.date.accessioned2025-08-14T18:25:49Z
dc.date.available2025-08-14T18:25:49Z
dc.date.issued22025
dc.description.abstractThis paper investigates the effects of a Corotating Interaction Region (CIR)/High-Speed Stream (HSS)-driven geomagnetic storm from 13 to 23 October 2003, preceding the well-known Halloween storm. This moderate storm exhibited a prolonged recovery phase and persistent activity due to a High-Intensity Long-Duration Continuous AE Activity (HILDCAA) event. We focus on low-latitude ionospheric responses induced by Prompt Penetration Electric Fields (PPEFs) and Disturbance Dynamo Electric Fields (DDEFs). To assess these effects, we employed ground-based GNSS receivers, Digisonde data, and satellite observations from ACE, TIMED, and SOHO. An empirical model by Scherliess and Fejer (1999) was used to estimate equatorial plasma drifts and assess disturbed electric fields. Results show a ∼120 km uplift in hmF2 due to PPEF, expanding the Equatorial Ionization Anomaly (EIA) crest beyond 20° dip latitude. DDEF effects during HILDCAA induced sustained F-region oscillations (∼100 km). The storm also altered thermospheric composition, with [[O]/[N2] enhancements coinciding with TEC increases. Plasma irregularities, inferred from the Rate of TEC Index (ROTI 0.5–1 TECU/min), extended from equatorial to South Atlantic Magnetic Anomaly (SAMA) latitudes. These results demonstrate prolonged ionospheric disturbances under CIR/HSS forcing and highlight the relevance of such events for understanding extended storm-time electrodynamics at low latitudes.
dc.description.physical27 p.
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.uriCNPq (308258/2021-5, 138157/2024-3 and 109825/2024-1)
dc.format.mimetypePDF
dc.identifier.affiliationUniversidade do Vale do Paraíba
dc.identifier.affiliationInstituto Nacional de Pesquisas Espaciais
dc.identifier.bibliographicCitationABAIDOO, S. et al. CIR-Driven Geomagnetic Storm and High-Intensity Long-Duration Continuous AE Activity (HILDCAA) Event: Effects on Brazilian Equatorial and Low-Latitude Ionosphere-Observations and Modeling. Atmosphere, v. 16, n. 5, p. 1-27, 2025. Disponível em: 10.3390/atmos16050499.
dc.identifier.doi10.3390/atmos16050499
dc.identifier.urihttps://repositorio.univap.br/handle/123456789/1018
dc.language.isoen_US
dc.publisherMDPI
dc.rights.holderAtmosphere
dc.subject.keywordGeomagnetic storm
dc.subject.keywordIonospheric parameters
dc.subject.keywordSolar activity
dc.subject.keywordDisturbance dynamo
dc.titleCIR-Driven Geomagnetic Storm and High-Intensity Long-Duration Continuous AE Activity (HILDCAA) Event: Effects on Brazilian Equatorial and Low-Latitude Ionosphere-Observations and Modeling
dc.typeArtigos de Periódicos

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