“嫦娥一号”卫星观测近月太阳风离子特征

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1、第30卷第3期航天器环境工程2013年6月SPACECRAFTENVIRONMENTENGn町EERIN(}225FeaturesofsolarwindionsspacecraftneartheMoonobservedbyChang’E-1ZhongJunl，XieLunl，PuZuyinl，JiaoWeixinl，MotoharuNowadal，WangXinyue2，Zhan；Xiangu02，WangShijin2(1．SchoolofEarthandSpaceSciences，PekingUniversity，Beijing100871，China；2．Ce

2、nterforSpaceScienceandAppliedResearch，ChineseAcademyofSciences，Beijing100190，China)Abstract：ThesolarwindionsdetectorsonboardthespacecraftChang’E一1(CE·1)havemadeagreatcontributioninadvancingtheunderstandingofthesolarwind-Mooninteractionandtheinducednear-Moonplasmaenvironment．Severalfeat

3、uresofsolarwindionsneartheMoonwereobservedbytlleCE一1onDec30，2007：1)bothprotons(H+)andalphaparticles(He”)wereidentifiedintheslowsolarwind；2)theacceleratedsolarwindpickupionswererepeatedlyobservedonthelunardaysideunderthenterplanetarymagneticfield(IMF)毋dominantconditions；3)theaccelerated

4、pickupionsshowbeingangle—dependentclearlyandlocation—dependentsensitively；4)undertheIMFpositive(negative)毋conditions，thedecelerated(accelerated)solarwindH+intrudeddeepintothewakefromthewakeboundaryinthenorthernhemisphere．whiletheHe”populationintrudedlessdeepthanH+．Therevelationofthesef

5、eat盯esmaybeofgreathelptounderstandthenear-Moonplasmaenvironment．Keywords：Chang’E-1；near-Moonplasmaenvironment；solarwind；pickupions；lunarwakebottadaryCLCnumber：V417+．7Documentcode：AArticleID：1673—1379(2013)03—0225—05DOI：10．3969／j．issn．1673一1379．2013．03．0010IntroductionTheMoonlscommonlyc

6、onsideredasaheavenlybodywithoutsignificantatmosphereorglobalmagneticfieldsandinabsenceofanyionosphere．Unlikemagnetizedbodies(Earth，Jupiter,Saturn，etc．)thatwouldinteractwiththesolarwind，theMoon，whenitperiodicallyimmersesintheinterplanetarymedium，wouldactasanobstaclethatdirectlyabsorbsth

7、esolarwindparticlesthatimpactitssunlitsurface，creatingadownstreamplasma·voidcavityleftbehinditforseverallunarradii．whichisreferredtoasthe‘lunarwake’⋯．Mostofthesebasicviewsaboutthesolarwind．Mooninteractionshavebeenformedfromearlyplasma／magneticfieldexperimentsonboardExplorerandtheApol