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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 24, issue 12
Ann. Geophys., 24, 3491–3496, 2006
https://doi.org/10.5194/angeo-24-3491-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 24, 3491–3496, 2006
https://doi.org/10.5194/angeo-24-3491-2006
© Author(s) 2006. This work is distributed under
the Creative Commons Attribution 3.0 License.

  21 Dec 2006

21 Dec 2006

Global manifestations of a substorm onset observed by a multi-satellite and ground station network

H. Wang1,*, S. Y. Ma1, H. Lühr2, Z. X. Liu3, Z. Y. Pu4, C. P. Escoubet5, H. U. Frey6, H. Réme7, and P. Ritter2 H. Wang et al.
  • 1Inst. of Ionosphere and Magnetosphere, LOGEG, CNME; College of Electronic Informatics, Wuhan University, Wuhan 430079, P. R. China
  • 2GeoForschungsZentrum Potsdam, Telegrafenberg 14473 Potsdam, Germany
  • 3Center for Space Science and Applied research, Chinese Academy of Sciences, Beijing, P. R. China
  • 4School of Earth and Space Science, Peking University, Beijing 100871, P. R. China
  • 5ESA/ESTEC (SCI-RSSD), Postbus 299, Keplerlaan 1, 2200 AG Noordwijk, The Netherlands
  • 6Space Sciences Laboratory, University of California, Berkeley, USA
  • 7CESR/CNRS, 31029 Toulouse, France
  • *now at: University of Michigan, 2455 Hayward Str., Ann Arbor, 48109, USA

Abstract. With a favorable constellation of spacecraft and ground stations, a study is made on the global manifestations of a substorm onset. The onset occurred simultaneously and conjugately in both hemispheres, confirmed by observations of the auroral breakup from IMAGE FUV-WIC and a sudden intensification of a westward electrojet from ground-based magnetometers. Concurrently with the onset, field-aligned and Hall currents in the auroral ionosphere are observed by CHAMP, which are consistent with the signature of a Harang discontinuity. Immediately after the onset a magnetic field dipolarization is clearly observed by Double Star TC-1, located near the central magnetotail and subsequently, by the Cluster quartet. The observations can be explained by a dawnward propagation of the substorm current wedge at a speed of about 300 km/s.

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