Abstract
The geomagnetic superstorm of 20 November 2003 with Dst=−422 nT, one of the most intense in history, is not well understood. The superstorm was caused by a moderate solar eruptive event on 18 November, comprehensively studied in our preceding Papers I – III. The analysis has shown a number of unusual and extremely complex features, which presumably led to the formation of an isolated right-handed magnetic-field configuration. Here we analyze the interplanetary disturbance responsible for the 20 November superstorm, compare some of its properties with the extreme 28 – 29 October event, and reveal a compact size of the magnetic cloud (MC) and its disconnection from the Sun. Most likely, the MC had a spheromak configuration and expanded in a narrow angle of ≤ 14∘. A very strong magnetic field in the MC up to 56 nT was due to the unusually weak expansion of the disconnected spheromak in an enhanced-density environment constituted by the tails of the preceding ICMEs. Additional circumstances favoring the superstorm were i) the exact impact of the spheromak on the Earth’s magnetosphere and ii) the almost exact southward orientation of the magnetic field, corresponding to the original orientation in its probable source region near the solar disk center.
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Notes
According to the final data of the Kyoto Dst index service, http://wdc.kugi.kyoto-u.ac.jp/dst_final/index.html .
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Acknowledgements
We thank V. Sdobnov, K. Marubashi, and P. K. Manoharan for useful discussions and the materials, which they kindly made available to us. We thank the ACE/MAG and SWEPAM teams and the ACE Science Center for providing the solar wind data. We are grateful to anonymous reviewers for useful remarks. We thank the Center for Astrophysics and Space Sciences in USD for heliospheric 3D reconstruction made from the SMEI mission, which is a joint project of the University of California at San Diego, Boston College, the University of Birmingham (UK), and the Air Force Research Laboratory. This study was supported by the Russian Foundation of Basic Research under grants 11-02-00757, 11-02-01079, 12-02-00008, 12-02-92692, and 12-02-00037, the Program of basic research of the RAS Presidium No. 22, and the Russian Ministry of Education and Science under projects 8407 and 14.518.11.7047.
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Grechnev, V.V., Uralov, A.M., Chertok, I.M. et al. A Challenging Solar Eruptive Event of 18 November 2003 and the Causes of the 20 November Geomagnetic Superstorm. IV. Unusual Magnetic Cloud and Overall Scenario. Sol Phys 289, 4653–4673 (2014). https://doi.org/10.1007/s11207-014-0596-5
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DOI: https://doi.org/10.1007/s11207-014-0596-5