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1、1Themesosphericinversionlayerandsprites11*22S.Fadnavis,DevendraaSiingh,R.P.Singh314IndianInstituteofTropicalMeteorology,Pune-411008,India.25Vice-Chancellor,VeerKunwarSinghUniversity,Ara(Bihar)-802301,India.*6alsoat,CenterforSun-ClimateResearch,DanishNationalSp
2、aceCenter,DK-2100,7Copenhagen,Denmark8Abstract9TheverticalstructureoftemperatureobservedbySABER(SoundingofAtmosphere10usingBroadbandEmissionRadiometry)aboardTIMED(Thermosphere,Ionosphere,11MesosphereEnergeticsandDynamics)andspritesobservationsmadeduringtheEuro
3、sprite122003-2007observationalcampaignwereanalyzed.Spriteobservationsweremadeattwo’’’’13locationsinFrance,namelyPuydeDôme(45°46'19.2N;02°57'44.64E;1.464km0’’’0’14altitude)intheFrenchMassifCentralandatthePicduMidi(425611N;000834’’E;152.877kmaltitude)intheFrench
4、Pyrénées.Itisobservedthattheverticalstructureof16temperatureshowsevidenceforaMesosphericInversionLayer(MIL)onthosedayson17whichspriteswereobserved.Afeweventsarealsoreportedinwhichspriteswerenot18recorded,althoughthereisevidenceofaMILintheverticalstructureofthe
5、temperature.Itis19proposedthatbreakinggravitywavesproducedbyconvectivethunderstormsfacilitatethe20productionof(a)spritesbymodulatingtheneutralair-densityand(b)MILsviathe21depositionofenergy.Thesamepropositionhasbeenusedtoexplainobservationsof22lightingsaswella
6、sbothMILsandlightningarisingoutofdeepconvections.1231.Introduction24MesosphericInversionLayers(MILs)overlowandmid-latitudeshavebeenreported25inanumberofstudies[Schmidlin,1976;Hauchecorneetal.,1987;Leblancand26Hauchecorne,1997;Meriwetheretal.,1998;StatesandGard
7、ner,1998;Kumaretal.,2001;27FadnavisandBeig,2004;Fadnavisetal.,2007].TherearetwotypesofMILs(1)lower28MILs(~75km)and(2)upperMILs(~90km)[FadnavisandBeig,2004;Meriwetherand29Gerrard,2004].PossiblemechanismsforproductionofMILshavebeenreviewedby30[MeriwetherandGardn
8、er,2000].MeriwetherandGerrard[2004]statedthatthelowerMILs31aretheresultofdissipatingplanetarywavesandamechanismresponsiblefortheformation32oftheupperMILmaybenonlineargravitywave-ti
