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.authorde Abreu A.J.
dc.contributor.authorCorreia E.
dc.contributor.authorJonah O.F.
dc.contributor.authorVenkatesh K.
dc.contributor.authorThomas E.G.
dc.contributor.authorde Jesus R.
dc.contributor.authorRoberto M.
dc.contributor.authorAbalde J.R.
dc.contributor.authorFagundes P.R.
dc.date.accessioned2025-04-01T06:20:13Z
dc.date.available2025-04-01T06:20:13Z
dc.date.issued2025
dc.description.abstract© 2024 Elsevier LtdIn 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 obtained 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.volume266
dc.identifier.doi10.1016/j.jastp.2024.106394
dc.identifier.issnNone
dc.identifier.urihttps://dspace.mackenzie.br/handle/10899/40387
dc.relation.ispartofJournal of Atmospheric and Solar-Terrestrial Physics
dc.rightsAcesso Restrito
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.typeArtigo
local.scopus.citations0
local.scopus.eid2-s2.0-85212331945
local.scopus.subjectGeneral circulation model
local.scopus.subjectHigh-latitude regions
local.scopus.subjectIntense geomagnetic storms
local.scopus.subjectPenetration electric field
local.scopus.subjectPrompt penetration
local.scopus.subjectRecovery phase
local.scopus.subjectSimulation studies
local.scopus.subjectThermosphere-ionosphere
local.scopus.subjectVertical total electron contents
local.scopus.updated2025-04-01
local.scopus.urlhttps://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85212331945&origin=inward
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