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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 22, issue 2
Ann. Geophys., 22, 673-687, 2004
https://doi.org/10.5194/angeo-22-673-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 22, 673-687, 2004
https://doi.org/10.5194/angeo-22-673-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.

  01 Jan 2004

01 Jan 2004

Formation of a strong southward IMF near the solar maximum of cycle 23

S. Watari1, M. Vandas2, and T. Watanabe3 S. Watari et al.
  • 1Communications Research Laboratory, 4-2-1 Nukuikita, Koganei, Tokyo 184-8795, Japan
  • 2Astronomical Institute, Bocni II 1401, 14131 Praha 4, Czech Republic
  • 3Ibaraki University, 2-1-1 Bunkyo, Mito, Ibaraki 310-8512, Japan

Abstract. We analyzed observations of the solar activities and the solar wind parameters associated with large geomagnetic storms near the maximum of solar cycle 23. This analysis showed that strong southward interplanetary magnetic fields (IMFs), formed through interaction between an interplanetary disturbance, and background solar wind or between interplanetary disturbances are an important factor in the occurrence of intense geomagnetic storms. Based on our analysis, we seek to improve our understanding of the physical processes in which large negative Bz's are created which will lead to improving predictions of space weather.

Key words. Interplanetary physics (Flare and stream dynamics; Interplanetary magnetic fields; Interplanetary shocks)

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