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THEMIS observations of two substorms on February 26,2008

Science China(Technological Sciences) 2010年第5期53卷 1328-1337页

作者： CHU XiangNing PU ZuYin CAO Xin WANG Jue V.MISHIN V.ANGElOPOUlOS lIU Jiang WEI Yong K.H.GlASSMEIER J.MCFADDEN D.lARSON S.MENDE H.FREY C.T.RUSSEll I.MANN D.SIBECK ZONG QiuGang FU SuiYan XIE lun T.I.SAIFUDINOVA M.V.TOlOCHKO l.a.sapronova H.REME E.lUCEK School of Earth and Space Sciences Peking UriiversityBeijing 100871China Institute of Solar-Terrestrial Physics Russian Academy of Sciences IGPP UCLA Instiute of Geophysics and Extraterrestrial Physics Technical University of BraunschweigBraunschweig and Max Planck Institute of Solar System Research Space Sciences laboratory University of California Department of Physics University of Alberta Code 674 NASA/GSFC Centre d'Etude Spatiale des Rayonnements Blackett laboratory Imperial College London

Two substorms occurred at ～04:05 and ～04:55 UT on February 26,2008 are studied with the in-situ observations of THEMIS satellites and ground-based aurora and magnetic field *** et *** made a comprehensive study of the 04:55 UT *** showed detailed features of the two substorms with much attention to the first event and to the rela-tionship between mid-tail magnetic reconnection(MR) and substorm *** was found that in the earlier stage of each substorm,a first auroral intensification occurred 2-3 min soon after the start of mid-tail MR,followed by a slow and very lim-ited *** auroral arcs were weak,short-lived,and localized,characterizing all features of a *** re-garded the first auroral brightening as the initial onset of the substorms.A few minutes later,a second stronger auroral intensification appeared,followed by quick and extensive *** was interesting to note that the second brightening and related poleward expansion happened almost simultaneously(within a couple of minutes) with the onset of earthward flow and dipolarization in the near-Earth tail and other phenomenon of the substorm expansion *** thus regarded the second auroral brightening as the major onset of the ***,it was seen that during the growth phase of the two substorms,the polar cap open flux Ψ kept increasing,while it quickly reduced during the substorm expansion and recovery *** variations of Ψ implied that the evolution of the two substorm expansion phases were closely related to MR of tail lobe open field *** of substorm activities revealed that the two events studied were small substorms;while estimate of MR rate indicated that the MR processes in the two substorms were *** aforementioned observations suggested that mid-tail MR initiated the pseudobreakup first;the earthward flow generated by MR transported magnetic flux and energy to the near-Earth tail to cause the formatio

关键词： substorm auroral intensification/brightening auroral expansion dipolarization magnetic reconnection

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THEMIS星座对2008年2月26日磁层亚暴的观测--磁尾重联触发的亚暴分析研究

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中国科学：技术科学 2010年第5期40卷 565-574页

作者：褚项宁濮祖荫曹馨 V.MISHIN 王珏魏勇宗秋刚傅绥燕谢伦 V.ANGElOPOUlOS 刘江 K.H.GlASSMEIER J.MCFADDEN D.lARSON S.MENDE H.FREY C.T.RUSSEll I.MANN D.SIBECK T.I.SAIFUDINOVA M.V.TOlOCHKO l.a.sapronova H.REME E.lUCEK 北京大学地球与空间科学学院北京100871 Institute of Solar-Terrestrial Physics Russian Academy of SciencesIrkutskRussia IGPP UCLALos AngelesCalifomiaUSA Instiute of Geophysics and Extraterrestrial Physics Technical University of BraunschweigBraunschweig and Max Planck Institute of SolarSystem ResearchKatlenburg-LindauGermany Space Sciences laboratory University of CaliforniaBerkeleyCaliforniaUSA Department of Physics University of AlbertaEdmontonAlbertaCanada Code 674 NASA/GSFCGreenbeltMDUSA Centre d'Etude Spatiale des Rayonnements ToulouseFrance Blackett laboratory Imperial College LondonLondonUK

本文利用THEMIS卫星结合地面极光和地磁的观测,研究了2008年2月26日04:05和04:55UT的两次亚暴事件.Angelopoulos已经对发生在04:55UT的第二个亚暴事件做了分析.本文对两次亚暴的相关活动进行了详细研究,特别对第一次做了深入讨论,并着... 详细信息

本文利用THEMIS卫星结合地面极光和地磁的观测,研究了2008年2月26日04:05和04:55UT的两次亚暴事件.Angelopoulos已经对发生在04:55UT的第二个亚暴事件做了分析.本文对两次亚暴的相关活动进行了详细研究,特别对第一次做了深入讨论,并着重分析了磁重联与亚暴活动的关系.在两次亚暴的初始阶段,第一次极光增亮发生在中磁尾磁重联后2～3min,但是持续时间较短,极向膨胀缓慢,与伪暴的特征相似,标志了亚暴的初突发(initial onset).两次亚暴都存在第二次极光增亮和极光的极向膨胀,且时间与近地磁尾观测的地向流和磁场偶极化同时发生,并与亚暴膨胀相的其他活动的发生同步,标志了亚暴的主突发(major onset).在两次亚暴的增长相期间,极盖区开放磁通量持续增加;在亚暴膨胀相和恢复相中,极盖区磁通量迅速减少.表明两次亚暴膨胀相的演化分别与两次尾瓣开放磁力线重联过程相联系的.从亚暴活动的参数分析,这两次亚暴都属于小亚暴范围;从重联率分析,两次磁重联都属于弱重联.本文的观测结果表明,中磁尾磁尾重联首先触发伪暴;高速流将磁通量和能量传输到近地磁尾;高速流减速最终导致亚暴电流楔(substorm current wedge,简称SCW)的形成和电流中断,产生近地偶极化和极光膨胀,引起亚暴膨胀相突发.本文的观测结果是对近地中性线模型(near earth neutral line,简称NENl)和重联-电流中断协同模型(synthesis scenario of MR and CD,简称RCS)模型及亚暴膨胀相两步突发观点的有力支持.

关键词：亚暴极光增亮极光膨胀磁场偶极化磁重联

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