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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 18, issue 1
Ann. Geophys., 18, 65–73, 2000
https://doi.org/10.1007/s00585-000-0065-3
© European Geosciences Union 2000
Ann. Geophys., 18, 65–73, 2000
https://doi.org/10.1007/s00585-000-0065-3
© European Geosciences Union 2000

  31 Jan 2000

31 Jan 2000

The response of the azimuthal component of the ionospheric electric field to auroral arc brightening

V. Safargaleev1, W. Lyatsky1, N. G. Gazey2, P. N. Smith3, and V. Kriviliov1 V. Safargaleev et al.
  • 1Polar Geophysical Institute, Apatity, 184200, Russia
  • E-mail: safar@pgi.kolasc.net.ru
  • 2EISCAT group, Rutherford Appleton Laboratory, Chilton, Oxfordshire, OX11 0QX, UK
  • 3Space Physics Group, University of Sussex, Brighton, E Sussex BN1 9QH UK

Abstract. We have analyzed the response of azimuthal component of the ionospheric electric field to auroral arc activity. We have chosen for analysis three intervals of coordinated EISCAT and TV observations on 18 February, 1993. These intervals include three kinds of arc activity: the appearance of a new auroral arc, the gradual brightening of the existing arc and variations of the arc luminosity. The arcs were mostly east-west aligned. In all cases, the enhancement of arc luminosity is accompanied by a decrease in the westward component of the ionospheric electric field. In contrast, an increase of that component seems to be connected with arc fading. The observed response is assumed to have the same nature as the "short circuit" of an external electric field by the conductor. The possible consequence of this phenomenon is discussed..

Keywords. Ionosphere (electric fields and currents; ionospheric irregularities) · Magnetospheric physics (auroral phenomena)

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