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Shrinkage of magnetosphere observed by TC-1 satellite during the high-speed solar wind stream

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Abstract

During the interval 06:14–07:30 UT on August 24, 2005, since the Earth’s magnetopause was suddenly compressed by the persistent high-speed solar wind stream with the southward component of the interplanetary magnetic field (IMF), the magnetopause moved inward for about 3.1 RE. Meanwhile, TC-1 satellite shifted from northern plasma sheet to the northern lobe/mantle region, although it kept inward flying during the interval 06:00–07:30UT. The shift of TC-1 from the plasma sheet to the lobe/mantle is caused by the simultaneous inward displacements of the plasma sheet and near-Earth lobe/mantle region, and their inward movement velocity is larger than the inward motion velocity of TC-1. The joint inward displacements of the magnetopause, the lobe/mantle region and the plasma sheet indicate that the whole magnetosphere shrinks inward due to the magnetospheric compression by the high-speed solar wind stream, and the magnetospheric ions are attached to the magnetic field lines (i.e. ‘frozen’ in magnetic field) and move inward in the shrinking process of magnetosphere. The large shrinkage of magnetosphere indicates that the near-Earth magnetotail compression caused by the strong solar wind dynamic pressure is much larger than its thickening caused by the southward component of the IMF, and the locations of magnetospheric regions with different plasmas vary remarkably with the variation of the solar wind dynamic pressure.

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Authors and Affiliations

  1. State Key Laboratory of Space Weather/CSSAR, Chinese Academy of Sciences, Beijing, 100190, China

    LiuYuan Li, JinBin Cao, GuoCheng Zhou, JunYing Yang & ChunXiao Yan

  2. Space Research Institute, Austrian Academy of Sciences, 8042, Graz, Austria

    TieLong Zhang

  3. Centre d’Etude Spatiale des Rayonnements, BP 4346, 31028, Toulouse cedex 4, France

    H. Rème & I. Dandouras

  4. The Blackett Laboratory, Imperial College, London, SW7 2BZ, UK

    C. M. Carr

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  1. LiuYuan Li
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  2. JinBin Cao
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  3. GuoCheng Zhou
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  7. H. Rème
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  9. C. M. Carr
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Correspondence to LiuYuan Li.

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Supported by the National Natural Science Foundation of China (Grant Nos. 40604018, 40523006), CSSAR (Grant No. O72114AA4S), Scientific Research Start-up Foundation for President Prize of CAS, 973 Program of China (Grant No. 2006CB806305) and the Specialized Research Fund for State Key Laboratories

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Li, L., Cao, J., Zhou, G. et al. Shrinkage of magnetosphere observed by TC-1 satellite during the high-speed solar wind stream. Sci. China Ser. E-Technol. Sci. 51, 1695–1703 (2008). https://doi.org/10.1007/s11431-008-0258-7

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  • DOI: https://doi.org/10.1007/s11431-008-0258-7

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