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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 15, issue 8
Ann. Geophys., 15, 959–966, 1997
© European Geosciences Union 1997
Ann. Geophys., 15, 959–966, 1997
© European Geosciences Union 1997

  31 Aug 1997

31 Aug 1997

Luminosity variations in several parallel auroral arcs before auroral breakup

V. Safargaleev, W. Lyatsky, and V. Tagirov V. Safargaleev et al.
  • Polar Geophysical Institute, Apatity, 184200, Russia

Abstract. Variation of the luminosity in two parallel auroral arcs before auroral breakup has been studied by using digitised TV-data with high temporal and spatial resolution. The intervals when a new arc appears near already existing one were chosen for analysis. It is shown, for all cases, that the appearance of a new arc is accompanied by fading or disappearance of another arc. We have named these events out-of-phase events, OP. Another type of luminosity variation is characterised by almost simultaneous enhancement of intensity in the both arcs (in-phase event, IP). The characteristic time of IP events is 10–20 s, whereas OP events last about one minute. Sometimes out-of-phase events begin as IP events. The possible mechanisms for OP and IP events are discussed.

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