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1、ArticleGeophysicsAugust2010Vol.55No.23:2542−2547doi:10.1007/s11434-010-3096-5SPECIALTOPICS:Statisticalsurveyonthemagneticfieldinmagnetotailcurrentsheets:Clusterobservations1,2,3*1341,2RONGZhaoJin,SHENChao,LUCEKE,BALOGHA&YAOLi1InstituteofGeologyandGeoph
2、ysics,ChineseAcademyofSciences,Beijing100029,China;2StateKeyLaboratoryofSpaceWeather,CenterforSpaceScienceandAppliedResearch,ChineseAcademyofSciences,Beijing100190,China;3CollegeofEarthScience,GraduateUniversityofChineseAcademyofSciences,Beijing100049,
3、China;4ImperialCollege,LondonSW72AZ,UnitedKingdomReceivedJuly3,2009;acceptedSeptember28,2009ThedistributionpropertiesofthemagneticfieldinmagnetotailcurrentsheetshavebeenexploredstatisticallywiththemagneticmeasurementdataoftheClustermissionfromJunetoNov
4、emberoftheyears2001–2005.Itisfoundthat,onaverage,thestrengthofthemagneticfieldanditsBzcomponentinthecurrentsheetareweakerintheregionclosetomidnightbutstrongernearthedawnsideanddusksideflanks,whichimpliesthat,ingeneral,athinnercurrentsheetoccursnearmidn
5、ightandthickeronesnearbothflanks.Theoccurrenceoftailcurrentsheetflappingishigheronbothflanksthaninthemidnightregion,althoughitismostfrequentinthedawnflank.CurrentsheetswithanegativeBzcomponentorastrongBycomponenthaveahigherprobabilityofoccurringatmagne
6、ticlocaltimesof21:00–01:00,indicatingthatmagneticactivity,e.g.magneticreconnectionandcurrentdis-ruptionoccurmorefrequentlythere.Statistically,theprobabilitydistributionsoftheBycomponentandthetiltangleofmagneticfieldlinesinthecurrentsheetareapproximatel
7、ynormaldistributions,andtheoccurrenceprobabilityoftheflattenedcurrentsheetisaboutonethirdthatofthenormalcurrentsheet.ThemagneticfieldandBzcomponentinthecurrentsheetmainlyvaryfrom1nTto10nT.TheBycomponentinthetailcentralcurrentsheetisonaveragetwicetheIMF
8、Byat1AU.magnetosphere,magneticfield,magnetotailcurrentsheet,neutralsheet,dawn-duskasymmetryCitation:RongZJ,ShenC,LucekE,etal.Statisticalsurveyonthemagneticfieldinmagnetotailcurrentsheets:Clusterobservations.ChineseSciBull,2010,55:2542–2
