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2004年3月13日TC-1和Cluster卫星联合观测的磁通量传输事件

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空间科学学报 2009年第2期29卷 166-174页

作者：张清和刘瑞源黄际英 dunlop m.w.胡红桥胡泽骏 Bogdanova Y V w.lsh A 西安电子科技大学理学院西安710071 中国极地研究中心 Space Science Departm.nt Rutherford-Appleton LaboratoryChiltonDidcotUK m.llard Space Science Laboratory University College LondonDorkingSurreyUK

分析了2004年3月13日12:15到12:25UT期间TC-1和Cluster卫星簇的磁通门磁力计(FGm.和电子/电流试验仪(PEACE)的联合观测数据.在此期间,TC-1卫星位于日下点以南的磁层顶附近的磁鞘中,并在12:19UT左右观测到了一个典型的先正后负的磁鞘磁... 详细信息

分析了2004年3月13日12:15到12:25UT期间TC-1和Cluster卫星簇的磁通门磁力计(FGm.和电子/电流试验仪(PEACE)的联合观测数据.在此期间,TC-1卫星位于日下点以南的磁层顶附近的磁鞘中,并在12:19UT左右观测到了一个典型的先正后负的磁鞘磁通量传输事件(FTE);向Cluster卫星簇位于北半球日侧高纬磁层顶附近,并于12:23UT左右穿出磁层顶进入磁鞘,且在12:21UT左右也观测到了一个典型的先正后负的磁层FTE.比较分析发现此两个FTE具有类似的磁场结构和等离子体特征,可能是同一个北向运动的FTE先后被TC-1和Cluster卫星观测到.利用Cluster 4颗卫星的多点同时观测数据,采用最小方向微分法和时空微分方法,推断Cluster卫星观测的这个FTE是尺度大小约为1.21 R_e的准二维结构,其运动方向为东北方向,与Cooling模型预测方向基本一致.利用Cooling模型的预测,推算了TC-1卫星在12:19UT观测的FTE的运动速度和尺度,进而得出随着通量管的极向运动,其速度和尺度均有所增加.

关键词：磁重联 FTE Cooling模型 Cluster

m.lti-Spacecraft Observation of a High-Speed Flow.Event at the Dayside m.gnetopause for Strong Im. By: A prelim.nary Study

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Multi-Spacecraft Observation of a High-Speed Flow Event at t...

第十一届全国日地空间物理学术讨论会

作者： m.w.dunlop C.m.Carr K.H.Glassm.ier H.Rem. A.Fazakerley Space Sciences Division RAL Oxford UK m.x-Planck-Institute for Solar System.Research Germ.ny IGm. TU Braunschw.ig Germany CNSR France m.SL UK

＜正＞At about 0330UT on February 23, 2005, Cluster w.s located at about （9.0,1.6,7.0）Re（GSm.;the GSm.locations of Double Star TC-1 and TC2 at 0430UT w.re about （10.4,0.4,2.1）Re and about （0.5,0.1,-1.4）Re in the low.altitude cusp, respectively. Inside the dayside m.gnetosheath close to the m.gnetopause, Bxabout 0, Bz w.s positive w.th the m.xim.m.being less than 20nT, and By≈-50nT. During 0320-0340 Cluster four spacecraft w.re traversing through the m.gnetopause and observed pronounced plasm. flow.in the m.gnetospheric boundary layer. The flow.speed w.s over 370 km.s, m.ch higher than the background m.gnetosheath flow.and directed polew.rd and duskw.rd. Prelim.nary analysis show. that this high-speed flow.m.y possibly m.nifest a reconnection event. In the m.antim., TC-1 at the low.latitude also observed high-speed flow.w.en the satellite entered the LLBL for a short tim. interval. The flow.w.s basically along the +y-direction and m.ch higher than the background m.gnetosheath flow. Interesting enough, just w.thin the tim. period of Cluster m.asurem.nt of high-speed flow. the Im.GE FUV observed both proton and electron aurora brightening on the duskside of polar ionosphere. One hour later around 0440UT, TC-1 w.s crossing the m.gnetopause from.the m.gnetosphere tow.rd the m.gnetosheath. The spacecraft encountered w.th high-speed flow.in the LLBL and an FTE in the m.gnetosheath. Of particular interest are the facts that just in the tim. period of TC-1 observation of high-speed flow. TC-2 detected sharp energetic electron enhancem.nts and the Im.GE FUV also saw.both proton and electron aurora brightening on the duskside of polar ionosphere. In addition, TC-2 also detected an energetic electron burst at the tim. w.en TC-1 encountered the FTE. Im.lications of this m.lti-spacecraft observation of a high-speed flow.event are discussed in this paper. The possible global reconnection pattern at the dayside m.gnetopause is also contem.lated.

关键词：

磁尾的等离子体片边界层场向电流密度与地磁活动指数Kp的关系分析

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中国科学：技术科学 2011年第11期41卷 1499-1504页

作者：程征伟史建魁 ZHANG Tie Long dunlop m.lcolm.刘振兴中国科学院空间科学与应用研究中心空间天气学国家重点实验室北京100190 Space Research Institute Austrian Academy of Sciences Graz A-8010 Austria SSTD Rutherford Appleton Laboratory SW7 2AZ UK

对2001年7月～10月Cluster穿越磁尾等离子体片边界层期间观测到的172个场向电流事件进行了研究,主要分析了等离子体片边界层场向电流特性与地磁活动指数之间的关系.研究结果表明:1)等离子体片边界层场向电流的相对发生率随地磁活动的增... 详细信息

对2001年7月～10月Cluster穿越磁尾等离子体片边界层期间观测到的172个场向电流事件进行了研究,主要分析了等离子体片边界层场向电流特性与地磁活动指数之间的关系.研究结果表明:1)等离子体片边界层场向电流的相对发生率随地磁活动的增强而增加;2)等离子体片边界层场向电流密度随Kp指数的增大而增大;在磁暴的主相阶段,场向电流迅速增大,电流密度最大达到19.05nA/m.,同时Kp增大至5;3)地磁活动指数Kp与等离子体片边界层区场向电流密度有着一致的变化关系.然而,当AE800nT时,场向电流密度随着AE的增加而减小.从而说明,等离子体片边界层场向电流密度与Kp指数的变化关系更为密切.

关键词：场向电流等离子体片边界层 Kp指数 AE指数

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Radial distribution of m.gnetic field in m.gnetotail current sheet center:Cluster and TC-1 observations

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Radial distribution of magnetic field in magnetotail current...

中国空间科学学会空间物理学专业委员会第十五届全国日地空间物理学研讨会

作者： Z.J.Rong w.X.w.n C.Shen m.w.dunlop T.L.Zhang CAS Key Laboratory of Ionospheric Environm.nt Institute of Geology and GeophysicsChinese Academy of Sciences Beijing National Observatory of Space Environm.nt Institute of Geology and GeophysicsChinese Academy of Sciences State Key Laboratory of Space w.ather Center for Space Science and Applied ResearchChinese Academy of Sciences Rutherford Appleton Laboratory ChiltonDIDCOTOxfordshire OX11 0QXUK CAS Key Laboratory of Geospace Environm.nt University of Science and Technology of China Space Research Institute Austrian Academy of SciencesGrazAustria

The radial distribution of m.gnetic field in m.gnetotail current sheet(CS)determ.nes the background conditions of plasm. distribution and evolution in tail CS,so that it is a key issue for further exploring the triggering location of substorm.*** the joint m.gnetic field data of Cluster-3(Sam.a)during 2001-2009 and TC-1 during 2004 in the m.gnetotail current sheets center,the dependence of the radial distribution of m.gnetic field w.thin the radial distance 6REm.gnetic activites and the external solar w.nd condition is statistically *** m.in results include:1)the m.gnetic field strength Bm.n and its Bz com.onent are enhaced m.st greatly as radial distance decreasing dow. to *** and Bz in the range of 10 REm.ller in the m.dnight and dusk flank region than that in the daw. reigon w.ich indicates the CS thickness is thinner there,show.ng a evident daw.-dusk asym.etry.2)The strength of Bm.n and Bz in quiet tim. are generally sm.ller than that in the active tim.,w.ich is m.st evidently for the m.dnight *** im.lies that the current sheet is generally thicker in active tim..3)The occurrence rate of negative Bz enhances greatly in active tim. around the m.dnight and dusk flank region,w.ich im.lies the tail activites have an evident daw.-dusk asym.etric distrbution.4)The electric current density increases evidently in the inner radial range 9RE1RE in active tim..5)Tow.rds earth,the By com.onent at both flank regions are m.re apt to be m.dulated by the diurnal w.bbling of the m.gnetic dipole axis.6)In the range of 10REm. By increases tow.rds *** correlation efficiency betw.en Im. By and CS By around m.dnight region is higher than that at both flank regions,w.ich m.ans the CS By at the m.dnight region is closer related to the Im. By relative to that at both flank *** the inner radial range,i.e.6 REw.th Im. By.

关键词：

Cluster and TC-1 observation of m.gnetic holes in the plasm. sheet

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Cluster and TC-1 observation of magnetic holes in the plasma...

第十四届全国日地空间物理学术研讨会

作者： m.w.dunlop A.P.w.lsh H.Rem. C.Carr E.Lucek A.Fazakerley Rutherford Appleton Laboratory Didcot OX11 0QX UK m.llard Space Science Laboratory University College London Holmbury St.Mary Dorking Surrey RH5 6NT UK Université de Toulouse

m.gnetic holes w.th relatively sm.ll scale sizes, detected by Cluster and TC-1 in the m.gnetotail plasm. sheet, are studied in this paper. It is found that these m.gnetic holes are spatial structures and they are not m.gnetic depressions generated by the flapping m.vem.nt of the m.gnetotail current sheet. m.st of the m.gnetic holes (93%) w.re observed during intervals w.th B z larger than B x, i.e., they are m.re likely to occur in a dipolarized m.gnetic field topology. For the random.y selected plasm. sheet crossing events there are only 31% of the cases have the m.gnetic field w.th Bz larger than Bx, suggesting that the occurrence of m.gnetic holes m.ght have a close relationship w.th the dipolarization process and/or a perturbed m.gnetosphere. The m.gnetic holes typically have a scale size com.arable to the local proton Larm.r radius and are accom.anied by an electron flux enhancem.nt at 90°pitch angle. It is also show. that m.st of the m.gnetic holes occur in the m.rginally m.rror-stable environm.nts;how.ver, w.ether the plasm. sheet m.gnetic holes are generated by the m.rror instability related to ions or not is unknow.. Com.arison of ratios, scale sizes and propagation direction of m.gnetic holes detected by Cluster and TC-1 suggests that m.gnetic holes observed in the vicinity of TC-1 orbit (-12Re) are likely further developed than those observed by Cluster (-18Re).

关键词： m.gnetic holes m.rror m.de structures plasm. sheet dipolarization

m.tters of m.m.nt / 1st complete English ed.

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Radial distribution of m.gnetic field in earth m.gnetotail current sheet

丛书名： m.terials for language practice

1980年

作者： by Ian dunlop and Heinrich Schrand edited by G.m

来源：畅想之星图书光盘版（南... 评论

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Radial distribution of magnetic field in earth magnetotail c...

中国科学院地质与地球物理研究所2014年度（第14届）学术年会

作者： Z.J.Rong w.X.w.n C.Shen A.A.Petrukovich w.Baum.ohann m.w.dunlop Y.C.Zhang Key Laboratory of Earth and Planetary Physics Institute of Geology and GeophysicsChinese Academy of Sciences Beijing National Observatory of Space Environm.nt Institute of Geology and GeophysicsChinese Academy of Sciences State Key Laboratory of Space w.ather Center for Space Science and Applied ResearchChinese Academy of Sciences

Know.ng the m.gnetic field distribution in the m.gnetotail current sheet(CS) is essential for exploring m.gnetotail *** this study,using a joint dataset of Cluster/TC-1,the radial profile of the m.gnetic field in the m.gnetotail CS w.th radial distances covering 8m.gnetic activity states(i.e.,AE≤100 nT for quiet intervals w.ile AE > 100 nT for active tim.s)and solar w.nd param.ters are statistically *** new.findings dem.nstrate that,independent of the activity state,the field strength and B com.onent(GSm.coordinates) start the m.notonic increase prom.nently as r decreases dow. to 1.5R,w.ich m.ans the dipole field starts to m.ke a significant contribution from.*** least in the surveyed radial range,the B com.onent is found to be w.aker in the m.dnight and dusk sectors than that in the daw. sector,displaying a daw.-dusk *** occurrence rate of negative B in active tim.s also exhibits a sim.lar asym.etric distribution,w.ich im.lies active dynam.cs m.y occur m.re frequently at m.dnight and dusk *** com.arison w.th that in quiet intervals,several features can be seen in active tim.s:(1) a local B m.nim.m.betw.en10.5m.onent around the m.dnight region is generally stronger and experiences larger fluctuations,and(3) a sharp positive/negative-excursion of the B com.onent occurs at the daw./dusk flank regions inside rw.nd param.ters revealed that the B com.onent is generally stronger under higher dynam.c pressure(P > 5 nPa),w.ich m.y support the daw.-dusk squeezing effect as presented by m.yashita et al.(2010).The CS B is generally correlated w.th the interplanetary m.gnetic field(Im.) B com.onent,and the correlation quality is found to be better w.th higher penetration coefficient(the ratio of CS B to Im. B) w.en Im. B is *** im.lications of the present results are discussed.

关键词： m.gnetotail m.gnetic structure Current sheet

TC-1卫星在近地磁尾(9～13 R_E)探测到的对流型高速流和场向高速流

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科学通报 2008年第14期53卷 1719-1723页

作者：张灵倩刘振兴马志为 w.Baum.ohann m.w.dunlop 王国军王霄 H.Rem. C.Carr 中国科学院空间科学与应用技术研究中心浙江大学聚变理论与模拟中心 Space Research Institute Austrian Academy of SciencesGraz68042Austrilia Space Sciences Division Rutherford Appleton LaboratoryChiltonDidcotOxfordshire OX110QXUK Centred'Etude Spatialedes Rayonnem.nts Toulouse Cedex F-78140France Im.erial College London SW72BZUK

对2004～2006年期间每年的6～11月(2006年截止到10月),共17个月的TC-1卫星上4s精度的FGm.HIA数据进行了统计分析.统计结果显示:在区域(-14RE 详细信息

对2004～2006年期间每年的6～11月(2006年截止到10月),共17个月的TC-1卫星上4s精度的FGm.HIA数据进行了统计分析.统计结果显示:在区域(-14REw.,BBFs)的特性一致,说明有相当数量的BBFs是可以进入近地13RE以内的.由于对流型高速流能够更有效的向近地磁尾输运能量,有可能会对亚暴触发过程产生重要的影响.

关键词：高速流对流型高速流场向高速流爆发性整体高速流

2001年8月-10月2次磁暴事件期间等离子体片边界层FAC与AE指数的关系分析

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中国科学（E辑） 2008年第5期38卷 708-714页

作者：程征伟史建魁张铁龙 dunlop m.刘振兴中国科学院空间天气学重点实验室北京100080 中国科学院研究生院北京100049 Space Research Institute Austrian Academy of Sciences Graz A-8010 Austria Im.erial College London SW7 2AZ UK

与以往单(双)卫星探测不同,利用ClusterⅡ四颗卫星的磁场数据,可以直接计算连续变化的场向电流(FAC)密度,这为研究场向电流与地磁活动之间的关系提供了一个很好的条件.对2001年8月和10月2次磁暴期间Cluster卫星穿越磁尾等离子体片边界... 详细信息

与以往单(双)卫星探测不同,利用ClusterⅡ四颗卫星的磁场数据,可以直接计算连续变化的场向电流(FAC)密度,这为研究场向电流与地磁活动之间的关系提供了一个很好的条件.对2001年8月和10月2次磁暴期间Cluster卫星穿越磁尾等离子体片边界层时的探测数据进行了分析,研究了这2个磁暴期间场向电流变化及其与极光电集流指数AE之间的关系.主要结果如下:(1)在这两次磁暴期间,场向电流有明显的增强;(2)从磁暴的急始到主相初期,场向电流密度的大小与AE指数近似负相关;(3)在主相后期和恢复相初期,场向电流密度大小与AE指数近似正相关;(4)在磁暴恢复相后期,场向电流与AE指数无明显变化关系.

关键词：电离层-磁层磁暴场向电流(FAC) AE指数