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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

DOI: 10.6038/cjg20141127, PP. 3729-3745

Keywords: 磁暴,亚暴,磁场偶极化,等离子体无色散注入,Pi2地磁脉动

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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~-179nT)主相期间的强亚暴(ALmin~-4046nT)事件特征.该强磁暴在大振幅(IMFBzmin~-55.57nT)、短持续时间(~90min)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100nT.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(~09:42:30UT),同步轨道卫星LANL1994-084观测到等离子体无色散注入(~09:44:30UT),X~-17.8RE处C1观测到磁场重联(~09:45:30UT),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.

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