Anomalous dynamics of the extremely compressed magnetosphere during 21 January 2005 magnetic storm

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題名:	Anomalous dynamics of the extremely compressed magnetosphere during 21 January 2005 magnetic storm
作者:	蘇亞拉;Dmitriev, A. V.;Suvorova, A. V.;Chao, J.-K.;Wang, C. B.;Rastaetter, L.;Panasyuk, M. I.;Lazutin, L. L.;Kovtyukh, A. S.;Veselovsky, I. S.;Myagkova, I. N.
貢獻者:	全球大氣觀測與資料應用研究中心
關鍵詞:	erupting filament;geomagnetic storm;Geophysics;Magnetic fields;magnetosphere boundary layers;ring current decay;Simulation
日期:	2014-02-01
上傳時間:	2026-04-23 11:23:52 (UTC+8)
出版者:	Wiley-Blackwell;Washington: Blackwell Publishing Ltd
摘要:	摘要： The dayside magnetosphere and proton radiation belt were analyzed during unusual magnetic storm on 21 January 2005. We have found that from 1712 to 2400 UT, the subsolar magnetopause was continuously located inside geosynchronous orbit due to strong compression. The compression was extremely strong from 1846 to 2035 UT when the dense plasma of fast erupting filament produced the solar wind dynamic pressure that peaked up to > 100 nPa, and during the first time, the upstream solar wind was observed at geosynchronous orbit for almost 2 h. Under the extreme compression, the outer magnetosphere at L > 5 was pushed inward, and the outer radiation belt particles moved earthward, became adiabatically accelerated, and accumulated in the inner magnetosphere at L < 4 that produced the intensified ring current with an exceptionally long lifetime. The observations were compared with predictions of various empirical and first‐principles models. All the models failed to predict the magnetospheric dynamics under the extreme compression when the minimal magnetopause distance was estimated to be ~3 RE. The inconsistencies might result from distortions of plasma measurements by extreme heliospheric conditions consisting in very fast solar wind streams and intense fluxes of solar energetic particles. We speculated that anomalous dynamics of the magnetosphere could be well described by the models if the He abundance in the solar wind was assumed to be > 20%, which is well appropriate for erupting filaments and which is in agreement with the upper 27% threshold for the He/H ratio obtained from Cluster measurements. Key Points Extreme compression pushes the bow shock inside geosynchronous orbit for ~2 h Ring current moves to the inner magnetosphere (L~3) with betatron energization High He abundance in the erupting filament allows predicting the observations 其他題名： J. Geophys. Res. Space Physics 出版者： Washington: Blackwell Publishing Ltd 出版日期： 2014-02 出處： Journal of geophysical research : Space physics (2013 - Present), 2014-02, Vol.119 (2), p.877-896 資源來源： Wiley Online Library - Journals 版權： 2014. American Geophysical Union. All Rights Reserved. 識別號： ISSN: 2169-9380 識別號： ISSN: 2169-9402 識別號： EISSN: 2169-9402 識別號： DOI: 10.1002/2013JA019534
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