Observation and simulation studies of ionospheric F-region in the South American and Antarctic sectors in the intense geomagnetic storm of August 2018

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dc.contributor.authorAbreu, Alessandro José de
dc.contributor.authorCorreia, Emilia
dc.contributor.authorJonah, Olusegun Folarin
dc.contributor.authorVenkatesh, Kavutarapu
dc.contributor.authorThomas, Evan G.
dc.contributor.authorJesus, Rodolfo F. de
dc.contributor.authorRoberto, Marisa
dc.contributor.authorAbalde, José Ricardo
dc.contributor.authorFagundes, Paulo Roberto
dc.date.accessioned2025-08-19T12:41:27Z
dc.date.available2025-08-19T12:41:27Z
dc.date.issued22025
dc.description.abstractIn this investigation, we present and discuss the ionospheric F region observations in the equatorial, low-, mid-, and near high-latitude regions in the South American and Antarctic sectors during the intense geomagnetic storm that occurred on 25–27 August 2018. The geomagnetic storm reached a minimum Dst of − 175 nT at ~0700 UT on 26 August. We present the variations of vertical total electron content (VTEC) from a chain of almost 200 GPS stations, covering the South American and Antarctic sectors. A comparison with model simulations from the Thermosphere Ionosphere Electrodynamics General Circulation Model (TIE-GCM) is realized. The results ob- tained show that during the main phase of the storm, a southward Bz component of the interplanetary magnetic field (IMF) and an eastward prompt penetration electric field (PPEF) can be observed, but they had no significant impact on the ionospheric plasma. A long recovery phase a predominance of positive phase is observed during daytime. The observations show the effects of an unusual case of multiple PPEF, occurred on 26 August, and effects of thermospheric winds disturbances, occurred on 27 August, resulting in increased VTEC values on both days. The TIE-GCM model reproduces the VTEC increases during the main and recovery phases from mid- latitudes to the equatorial region, but it underestimates the observed values near high-latitudes.
dc.description.physical18 p.
dc.description.sponsorshipConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
dc.description.uriCNPq (317447/2023- 8 and 300229/2024-0)
dc.format.mimetypePDF
dc.identifier.affiliationUniversidade do Vale do Paraíba
dc.identifier.affiliationInstituto Nacional de Pesquisas Espaciais
dc.identifier.affiliationInstituto Tecnológico de Aeronáutica
dc.identifier.affiliationUniversidade Presbiteriana Mackenzie
dc.identifier.affiliationInternational Geospace Group
dc.identifier.affiliationNational Atmospheric Research Laboratory
dc.identifier.affiliationDartmouth College
dc.identifier.bibliographicCitationABREU, Alessandro José de et al. Observation and simulation studies of ionospheric F-region in the South American and Antarctic sectors in the intense geomagnetic storm of August 2018. Journal of Atmospheric and Solar-Terrestrial Physics, v. 266, p. 1-18, 2025. Disponível em: 10.1016/j.jastp.2024.106394.
dc.identifier.doi10.1016/j.jastp.2024.106394
dc.identifier.urihttps://repositorio.univap.br/handle/123456789/1028
dc.language.isoen_US
dc.publisherElsevier
dc.rights.holderJournal of Atmospheric and Solar-Terrestrial Physics
dc.subject.keywordIonospheric
dc.subject.keywordF-region
dc.subject.keywordGeomagnetic storm
dc.titleObservation and simulation studies of ionospheric F-region in the South American and Antarctic sectors in the intense geomagnetic storm of August 2018
dc.typeArtigos de Periódicos

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