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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 27, issue 10
Ann. Geophys., 27, 4069–4073, 2009
https://doi.org/10.5194/angeo-27-4069-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

Special issue: Ninth International Conference on Substorms (ICS9)

Ann. Geophys., 27, 4069–4073, 2009
https://doi.org/10.5194/angeo-27-4069-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  28 Oct 2009

28 Oct 2009


High latitude magnetospheric topology and magnetospheric substorm

E. E. Antonova1,2, I. P. Kirpichev1,2, I. L. Ovchinnikov1, K. G. Orlova1, and M. V. Stepanova3 E. E. Antonova et al.
  • 1Skobeltsyn Institute of Nuclear Physics Moscow State University, Moscow, Russia
  • 2Space Research Institute RAS, Moscow, Russia
  • 3Physics Department, Universidad de Santiago de Chile, Santiago, Chile

Abstract. This study is focused on the problem of the localization of substorm expansion onset. In this context, the high latitude topology of transverse magnetospheric currents has been analyzed. This study has included the radial distribution of plasma pressure near noon, obtained using the THEMIS-B satellite data, the daytime compression of magnetic field lines and the existence of magnetic field minima far from the equatorial plane, given by all geomagnetic field models. As a result, the dayside integral transverse currents at the geocentric distances 7–10 RE has been estimated. It is suggested, that nightside transverse currents at geocentric distances ~7–10 RE are closed inside the magnetosphere and with dayside transverse currents form surrounding the Earth current system (cut ring current or CRC) which topologically is the high latitude continuation of ordinary ring current. A possibility of localization of substorm expansion onset at the nighside CRC region is analyzed using the experimental evidences that the onset is localized at geocentric distances <10 RE.

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