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1、SolarCycleVariationsofTopsideElectronDensityandTemperature:Altitudinal,Latitudinal,andSeasonalDifferences.D.Bilitza(1),P.Richards(2),V.Truhlik(3),T.Abe(4),L.Triskova(3)(1)RaytheonITSS,GSFC,SPDF,Greenbelt,USA(2)NASA,Earth-SunSystemsDivision,WashingtonDC,USA(3)Instituteof
2、AtmosphericPhysics,Praha,CzechRepublic(4)AerospaceExplorationAgency(JAXA),Sagamihara,JapanSummaryGoal:DetermineTesolarcyclevariationforinclusioninIRI.Source:DatabaseofsatelliteinsitumeasurementsandFLIPmodelThisStudy:SolaractivityvariationofNeandTeat550,900,and2000km,for
3、MLT=2,and13,duringallseasonsPreviousStudies–Balanetal.,2001-MURadarBalanceofgain,loss,andtransportprocessesforthermalenergycanresultinincreaseordecreasewithsolaractivity.PreviousStudies–Oyamaetal.,2002-AkebonoAthighaltitudestheheattransportfromtheplasmasphereresultsinan
4、increasewithsolaractivity.PreviousStudies–Zhang,Holt,2004–MillstoneHillDatabaseAkebono,sinceFeb1989,700–10,000km,-75-75AltitudinalDifferences–JicamarcalatitudeAltitudinalDifferences–Jicamarca:AltitudinalDifferences–MillstoneHill:MidnightNoonAveragesofAkebonoelectrontemp
5、eraturesversussolarfluxfordifferentaltituderangesduringdaytimeforsummer(top)andwinter(right)conditionsseemtoindicateanincreasewithsolarfluxathigheraltitudesandadecreaseforthelowerheightrangeandnosignificantseasonalchanges.Equinox,mid-latitude,noon550km900km2000kmLog(Ne)
6、TeWinter,mid-latitude,midnight550km900km2000kmLog(Ne)Te600kmNoon,Mid-lat900km1500km2200kmMidnight,Mid-latMidnight,EquatorNoon,EquatorSeasonalDifferencesMid-latitude,noon,550kmEquinoxSummerWinterMid-latitude,noon,900kmEquinoxSummerWinterMid-latitude,noon,2000kmEquinoxSum
7、merWinterSummerEquinoxWinterResultsNeincreaseswithsolaractivityforallcases.Solarcycleeffectsarestrongestatlowaltitudes.-TechangesoverthesolarcyclearegenerallymuchsmallerthanthoseofNeandshowaseasonaldependenceduringdaytime:increasesinsummer,constantorsmalldecreaseinwinte
8、r,decreaseinequinox.FLIPgenerallyconfirmstheNetrendsseeninourdatabase.FLIPagreeswellwiththeTedaytimevalues.-Du
