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1、JOURNALOFGEOPHYSICALRESEARCH,VOL.117,A06308,doi:10.1029/2011JA017416,2012ForcingtheTIEGCMmodelwithBirkelandcurrentsfromtheActiveMagnetosphereandPlanetaryElectrodynamicsResponseExperiment1223S.Marsal,A.D.Richmond,A.Maute,andB.J.AndersonReceived30November2011;revised13March2012;accepted16April2012
2、;published6June2012.[1]Geomagneticfield-alignedcurrentsfromtheActiveMagnetosphereandPlanetaryElectrodynamicsResponseExperiment(AMPERE)satellitemissionareusedtodrivetheThermosphere-Ionosphere-ElectrodynamicsGeneralCirculationModel(TIEGCM).Wepresentacomparisonbetweengroundmagneticsignaturescompute
3、dbythemodelandobservationsatfourdifferentgeomagneticobservatories,fordifferentmagneticdisturbancelevels.Resultsshowtheabilityofthemodeltopickupthegrossfeaturesofthemagneticvariations,improvingitsperformancewithincreasingdisturbancelevelandfromlowtohighlatitudes.Duringgeomagneticallyquiescentcond
4、itionsabaselinenoiseofabout5nTisevidentinreconstructedgroundmagneticfieldsignatures,whichweattributetothebaselinenoiselevelintheAMPEREcurrents.Forvariationsshorterthanabout30minthemodeledsignalsareoftensignificantlylowerthanobservedbyafactorupto3to4,possiblyreflectinglocalizedionizationstructure
5、snotcapturedintheTIEGCMconductancemodules,ormissingsmall-scaleandrapidtemporalvariationsinauroralcurrents.Whiletheobservedhorizontalfieldvariationsarereflectedinthemodel,theverticalcomponentisconsistentlyunderestimated,possiblyindicatingerrorsintheestimatesforgroundinductioncurrents.Comparisonwi
6、ththestandardversionoftheTIEGCMisalsocarriedout,showingthattimevariationsshorterthan6handdowntothe10minresolutionoftheAMPEREdata(whichdonotappearinthestandardversionofTIEGCM)arenowreflectedintheAMPERE-drivenmodel.Citation:Marsal,S.,A.D.Richmond,A.Maute,andB.J.Anderson(2012),ForcingtheTIEGCMmodel
7、withBirkelandcurrentsfromtheActiveMagnetosphereandPlanetaryElectrodynamicsResponseExperiment,J.Geophys.Res.,117,A06308,doi:10.1029/2011JA017416.1.Introductionoccurringatrelativelyhighlatitudesistheauroradisplay,alsoknownsinc
