Characterisation of GPS-TEC in the African equatorial and low latitude region and the regional evaluation of the IRI model

Adebiyi, S.J. and Adimula, I.A. and Oladipo, O.A. (2016) Characterisation of GPS-TEC in the African equatorial and low latitude region and the regional evaluation of the IRI model. Journal of Atmospheric and Solar-Terrestrial Physics, 143�. 53�70.

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Official URL: http://dx.doi.org/10.1016/j.jastp.2016.03.003

Abstract

With theincreasingapplicationofGlobalNavigationSatelliteSystem(GNSS)productsandservices, knowledgeoftheTotalElectronContent(TEC)variationisvital,particularlyinhistoricallyunder-sam- pled regions.Theionosphericinduced-error,whichisthelargestandmostvariableerrorsourceofGNSS applications, isproportionaltoTECalongthesatellite-receiverpath.SimultaneousGlobalPositioning System(GPS)measurementsfromsixAfricanequatorialandlowlatitudestationsinthesouthern hemisphere areusedtoinvestigatethelatitudinalvariationofTECovertheregionduringtheyear2013,a yearofmoderatesolaractivity.Theanalysisrevealssomedetailedfeaturesofseasonal,month-to-month and solaractivitydependenceofTEC.TheseasonalvariationofTECrevealedthatthedaytimeandthe pre-midnight valuesofTECforstationslocatedclosetothegeographicequatorisconsiderablyhigherin equinoxesandJunesolsticecomparedtostationsfartherfromtheequator,however,thedifferenceis insignificant duringtheDecembersolstice.Themonth-to-monthvariationofTECshowssemi-annual symmetry/asymmetry inTECvaluesforstationscloser/fartherfromtheequator.TECsensitivitytosolar activity showssignificant seasonalandlatitudinalcharacteristics.Generally,arelativelygoodcorrelation existsbetweenTECandF10.7forstationsaroundtheEquatorialIonizationAnomaly(EIA)regioncom- pared tothosefoundatstationsclosetotheequator.BeyondtheEIAregion,thecorrelationcoefficients drop inallseasons.TECpredictedbythethreetopsideoptionsoftheInternationalReferenceIonosphere (IRI) 2012model[i.e.theNeQuick(NeQ),IRI-2001Corrected(IRI-01Corr)andtheIRI-2001(IRI-01) options] exhibitslatitudinalandseasonalcharacteristics.TheNeQoptionperformedbetterthanthe other twooptionsatstationslocatedwithintheequatorialregioninmostofthemonthsandseasons. Outside theEIAregion,theIRI-01CorrandIRI-01optionsgivebetterpredictions.Generally,thethree model optionsgiveimprovedTECrepresentationswithincreasinglatitude.

Item Type: Article
Subjects: Q Science > QC Physics
Depositing User: SHOLA ADEBIYI
Date Deposited: 15 Jan 2024 07:37
Last Modified: 15 Jan 2024 07:37
URI: https://eprints.lmu.edu.ng/id/eprint/4404

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