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1、JOURNALOFGEOPHYSICALRESEARCH,VOL.117,A06216,doi:10.1029/2011JA017402,2012ProfileofstrongmagneticfieldBycomponentinmagnetotailcurrentsheets1,212345Z.J.Rong,W.X.Wan,C.Shen,X.Li,M.W.Dunlop,A.A.Petrukovich,67,89,10111L.-N.Hau,T.L.Zhang,H.Rème,A.M.Du,andE.LucekRecei
2、ved23November2011;revised30April2012;accepted1May2012;published12June2012.[1]ThestrongmagneticfieldBycomponent(inGSMcoordinates)hasbeenincreasinglynoticedtoplayanimportantroleinthedynamicsoftailcurrentsheet(CS).ThedistributionprofileofstrongBycomponentsinthetai
3、lCS(i.e.,thosewithguidefield),however,isnotwellknown.Inthepresentwork,byusingthesimultaneousmultipointobservationsofClustersatellites,theprofileofastrongBycomponentintailcurrentsheetsisexplored,throughdetailedcasestudies,aswellasinastatisticalstudy.Itisdiscover
4、edthataroundthemidnightmeridian,thestrengthofthestrongBycomponent,i.e.,
5、By
6、,isbasicallyenhancedatthecenteroftheCSrelativetothatintheCSboundariesandlobesandformsanorth-southsymmetricdistributionaboutthecenterofCS.Generally,however,forstrongguidefieldcasesintheno
7、n-midnightmeridian,theprofileofBystrengthbasicallybecomesnorth-southasymmetric,thestrengthoftheBycomponentinthenorthernsideoftheCSisfoundtobeeitherstrongerorweakerthanthatinthecounterpartsouthernside.Byconsideringthemodulationofthetailflaringmagneticfieldwithma
8、gneticlocaltime,weproposeaninterpretationtoaccountforthevariationoftheBy-profile,whichissupportedbythestatisticalsurvey.Theseresultsofferanobservationbasisforfurtherstudies.Citation:Rong,Z.J.,etal.(2012),ProfileofstrongmagneticfieldBycomponentinmagnetotailcurre
9、ntsheets,J.Geophys.Res.,117,A06216,doi:10.1029/2011JA017402.1.IntroductionwavyCS[e.g.,Zhangetal.,2002,2005a;Sergeevetal.,2003;Runovetal.,2005;Petrukovichetal.,2006;Shen[2]Recentstudieshavedemonstratedthattheconfigura-etal.,2008b;Rongetal.,2010a],basedonthediffe
10、renttionsofthemagnetotailcurrentsheet(CS)canbedividedmagneticgeometricconfigurationsintheCS.Normally,theintothreetypesi.e.,normalCS[e.g.,Shenetal.,2003,magneticfieldlines(MF
