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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 28, issue 9
Ann. Geophys., 28, 1625-1631, 2010
https://doi.org/10.5194/angeo-28-1625-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 28, 1625-1631, 2010
https://doi.org/10.5194/angeo-28-1625-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

  03 Sep 2010

03 Sep 2010

The large-scale magnetospheric electric field observed by Double Star TC-1

Z. H. He1, Z. X. Liu1, T. Chen1, C. Shen1, X. Li2, C. Carr3, and H. Rème4 Z. H. He et al.
  • 1State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing, China
  • 2Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO, USA
  • 3Space and Atmospheric Physics, the Blackett Laboratory, Imperial College, London, UK
  • 4CESR, Toulouse, France

Abstract. The relationship between the average structure of the inner magnetospheric large-scale electric field and geomagnetic activity levels has been investigated by Double Star TC-1 data for radial distances ρ between 4.5 RE and 12.5 RE and MLT between 18:00 h and 06:00 h from July to October in 2004 and 2005. The sunward component of the electric field decreases monotonically as ρ increases and approaches zero as the distance off the Earth is greater than 10 RE. The dawn-dusk component is always duskward. It decreases at about 6 RE where the ring current is typically observed to be the strongest and shows strong asymmetry with respect to the magnetic local time. Surprisingly, the average electric field obtained from TC-1 for low activity is almost comparable to that observed during moderate activity, which is always duskward at the magnetotail (8 RE~12 RE).

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