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Alternative TitleMulti-satellite joint observations of an intense substorm during the main phase of 24August,2005storm
孙晓英; 段素平; 刘维宁
Source Publication地球物理学报
Keyword磁暴 亚暴 磁场偶极化 等离子体无色散注入 Pi2地磁脉动
Abstract本文根据OMNI、TC-2卫星、LANL系列卫星、Cluster星簇卫星(C1—C4)以及加拿大的8个中高纬地磁台站的观测数据,研究了2005年8月24日强磁暴(SYM-Hmin~ -179 nT)主相期间的强亚暴(ALmin~ -4046 nT)事件特征。该强磁暴在大振幅(IMF Bz min~ -55.57 nT)、短持续时间(~90 min)的行星际磁场条件下产生,有明显的磁暴急始(SSC),强度较大且持续时间较短。发生在磁暴主相期间的亚暴发展的主要特征如下:亚暴增长相期间,C1—C4卫星先后穿越中心等离子体片;亚暴膨胀相触发后,在近地磁尾(X~-6RE)可观测到磁场偶极化现象;等离子体无色散注入区在亚暴onset开始后迅速沿经向扩展,但被限制在有限的经度范围;磁纬60°附近,Pi2地磁脉动振幅超过了100 nT。膨胀相开始后,在中、高磁纬地磁台站可观测到负湾扰,近地磁尾可观测到Pi2空间脉动,中磁尾区域可观测到尾向流、磁重联以及O+/H+数密度比值在亚暴onset之后增大等现象。分析表明该强磁暴主相期间的强亚暴现象发生时序是自内向外:X~-6RE处TC-2观测到磁场偶极化(~09:42:30 UT),同步轨道卫星LANL1994-084观测到等离子体无色散注入(~09:44:30 UT),X~-17.8RE处C1观测到磁场重联(~09:45:30 UT),由此推断该亚暴事件很可能是近地磁尾不稳定性触发产生,其发生区域距离地球很近。
Other AbstractObservational data from OMNI,TC-2,LANL series of satellites,Cluster(C1C4) and Canada′s eight mid-and high-magnetic latitude geomagnetic stations are used to investigate the features of the intense substorm (AL_(min)~-4046 nT) during the main phase of the 24 August,2005 storm (SYM-H_(min)~-179 nT).The intense storm that occurred on 24 August, 2005 was driven by the interplanetary magnetic field with significantly negative Bz (IMF B_(z min)~ -55.57nT),with a comparatively short duration(~90min).It had a significant storm sudden commence(SSC)and great intensity.The features of the intense substorm occurred during the main phase of the intense storm:during the growth phase,C1C4 satellites were passing through the central plasma sheet.After expansion phase onset,in the near magnetotail(X~ -6R_E),magnetic field polarization was observed.Dispersionless Plasma injection zone extended rapidly along the longitude direction after the substorm onset,but was restricted to a limited longitude range.Near magnetic latitude 60°,the oscillation intensity of Pi2 geomagnetic pulsation was over 100 nT.After expansion phase onset,the mid-and high-magnetic latitude geomagnetic stations observed negative bays;in the near-Earth magnetotail,TC-2 observed Pi2 pulsations;in the mid-magnetotail,tailward flow and magnetic reconnection was observed and the ratio of O~+/ H~+ number density increased.Observational results show that the timing of the features of the intense substorm which occurred in the main phase of the intense storm was inside-out:at~09∶ 42∶30UT,TC-2 observed magnetic field polarization at X~-6R_E;at~09∶43∶30UT,LANL 1994- 084 observed Plasma dispersionless injection;at~09∶45∶30UT,Cluster-1 observed magnetic reconnection at X~-17.8R_E.Therefore,we inferred that this substorm event was likely to be triggered by some instabilities occurring in the near-Earth magnetotail,and its triggering region was quite close to the Earth.
Indexed BySCI ; EI ; CSCD
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Document Type期刊论文
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GB/T 7714
孙晓英,段素平,刘维宁. 2005年8月24日磁暴主相期间亚暴过程的多卫星联合观测分析[J]. 地球物理学报,2014,57(11):3729-3745.
APA 孙晓英,段素平,&刘维宁.(2014).2005年8月24日磁暴主相期间亚暴过程的多卫星联合观测分析.地球物理学报,57(11),3729-3745.
MLA 孙晓英,et al."2005年8月24日磁暴主相期间亚暴过程的多卫星联合观测分析".地球物理学报 57.11(2014):3729-3745.
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