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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 15, issue 12
Ann. Geophys., 15, 1537–1547, 1997
© European Geosciences Union 1997
Ann. Geophys., 15, 1537–1547, 1997
© European Geosciences Union 1997

  31 Dec 1997

31 Dec 1997

Afternoon mid-latitude current system and low-latitude geomagnetic field asymmetry during geomagnetic storms

A. Grafe2, P. A. Bespalov1, V. Y. Trakhtengerts1, and A. G. Demekhov1 A. Grafe et al.
  • 1Institute of Applied Physics, 46 Ulyanov St., 603600 Nizhny Novgorod, Russia
  • 2GeoForschungsZentrum, Telegrafenberg, D-14473 Potsdam, Germany

Abstract. For four geomagnetic storms of middle intensity the relationship between the low-latitude magnetic field asymmetry using ASY indices and the intensity of the auroral eastward and westward electrojet was considered. It was asked whether there exists a connection between ASY and the eastward electrojet. To answer this question equivalent current systems were estimated in mid-latitudes. It was found that the observations obviously show no correlative relationship between the low-latitude magnetic-field asymmetry and the eastward electrojet, whereas one exists between ASY and the westward electrojet. To explain the generally accepted common three-dimensional current system between the partial ring current and the eastward electrojet, a condensor model of the three-dimensional current system was developed. It could be shown that the short periodic variations of the partial ring current are shielded by the condensor and cannot influence the eastward-electrojet current.

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