地磁与空间电磁环境研究室SeasonalbehaviorofmeteorradarwindsoverWuhanGuangxinZhao1,2,3,LiboLiu1,WeixingWan1,BaiqiNing1,andJiangangXiong11DivisionofGeomagnetismandSpacePhysics,InstituteofGeologyandGeophysics,ChineseAcademyofSciences,Beijing,100029,China2WuhanInstituteofPhysicsandMathematics,CAS,Wuhan,430071,China3GraduateSchooloftheChineseAcademyofSciences(ReceivedMarch23,2004;RevisedNovember9,2004;AcceptedNovember10,2004)Anewlyinstalledmeteorradarhasbeeninstalledtomeasurewindsinthemesosphereandlowerthermosphere(MLT)overWuhan(114.4◦E,30.6◦N).Inthepresentstudy,adatabaseofthefirst25months(February2002–February2004)ofobservationshasbeenanalyzedtoinvestigatetheclimatologyofmeanwindsandtides.Thedailyaveragezonalwindischaracteredbyastrongshearinsolsticesandanintenseeastwardflowinsummer.Thedailyaveragemeridionalwindisnorthwardinwinterandsouthwardinotherseasons.TherearesomediscrepanciesbetweentheradarmeanwindsandtheHWM93modelwinds.Thesummerzonalwindsandmeridionalwindsfromthemodelareobviouslyweakerthanourobservations.TheanalysisontidesindicatesthatthediurnaltideisdominantatWuhan.Theseasonalvariabilityisobservedinboththediurnalandsemidiurnaltidalamplitudeswiththemaximumvaluesoccurringusuallyneartheequinoxes.ComparedwiththeGlobalScaleWaveModel(GSWM00),theobservedresultsgenerallyshowasmallerdiurnaltidalamplitudeandalargersemidiurnaltidalamplitude.Keywords:Meteorradar,meanwinds,tides,MLTdynamics.TheterdiurnaltideinthemesosphereandlowerthermosphereoverWuhan(30◦N,114◦E)GuangxinZhao1,2,3,LiboLiu1,BaiqiNing1,WeixingWan1,andJiangangXiong11InstituteofGeologyandGeophysics,ChineseAcademyofSciences,Beijing,100029,China2WuhanInstituteofPhysicsandMathematics,ChineseAcademyofSciences,Wuhan,China3GraduateSchooloftheChineseAcademyofSciences,China(ReceivedAugust25,2004;RevisedApril18,2005;AcceptedApril18,2005)Windsmeasuredbyanall-skymeteorradarhavebeenusedtoinvestigatetheterdiurnaltideinthemesosphereandlowerthermosphere(MLT)regionoverWuhan(30.6◦N,114.4◦E).Wepresentaclimatologyoftheterdiurnaltideatlow-midlatitudesiteduringtheperiodofApril2002toDecember2004.Theterdiurnalpeakisdistinctinthelong-termpowerspectrumofthewind.Themonthlyandseasonalmeanmaximumamplitudeshavevaluesof7m/sand5m/s,respectively.Theshort-termamplitudescanoccasionallyreachupto30m/s,andattimestheterdiurnaltideisaslargeasthediurnalandsemidiurnalones.Itseemsthatthemeridionalcomponentismoreregularthanthezonalone.Anobviousannualvariationisobservedinthemeridionalphaseswithaphaseleadinginwinterthanthatinsummer.Theannualvariationfortheterdiurnaltidalamplitudeisnotobvious,andisvariablefromyeartoyearinourobservations.Thisseasonaltrendisslightlydifferentfromearlierstudiesatotherlocations.Keywords:Meteorradar,terdiurnaltide,mesosphericdynamics,nonlinearinteraction.Responsesofequatorialanomalytothectober−November2003superstormsB.Zhao1,2,3,W.Wan1,andL.Liu11InstituteofGeologyandGeophysics,ChineseAcademyofSciences,Beijing100029,China2WuhanInstituteofPhysicsandMathematics,CAS,Wuhan430071,China3GraduateSchoolofChineseAcademyofSciences,Beijing,ChinaReceived:8May2004–Revised:2December2004–Accepted:16December2004–Published:30March2005Abstract.TheresponsesofEquatorialIonizationAnomaly(EIA)tothesuperstormsofOctober−November2003wereinvestigatedusingthetotalelectroncontent(TEC)measuredwithglobalpositioningsystem(GPS)receiversinChina,SoutheastAsia,...
