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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 23, issue 6
Ann. Geophys., 23, 2117–2128, 2005
https://doi.org/10.5194/angeo-23-2117-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 23, 2117–2128, 2005
https://doi.org/10.5194/angeo-23-2117-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.

  15 Sep 2005

15 Sep 2005

The relationship between auroral hiss at high altitudes over the polar caps and the substorm dynamics of aurora

E. E. Titova1, A. G. Yahnin1, O. Santolík2, D. A. Gurnett3, F. Jirícek4, J.-L. Rauch5, F. Lefeuvre5, L. A. Frank3, J. B. Sigwarth3, and M. M. Mogilevsky6 E. E. Titova et al.
  • 1Polar Geophysical Institute, Apatity, Russia
  • 2Faculty of Mathematics and Physics, Charles University and Institute of Atmospheric Physics, Prague, Czech Republic
  • 3Department of Physics and Astronomy, University of Iowa, Iowa City, USA
  • 4Institute of Atmospheric Physics, Prague, Czech Republic
  • 5LPCE/CNRS, Orleans, France
  • 6Institute of Space Research, Moscow, Russia

Abstract. Strong variations of intensity and cutoff frequency of the auroral hiss were observed by INTERBALL-2 and POLAR satellites at high altitudes, poleward from the auroral oval. The hiss intensifications are correlated with the auroral activations during substorms and/or pseudo-breakups. The low cutoff frequency of auroral hiss increases with the distance between the aurora and the satellite footprint. Multicomponent wave measurements of the hiss emissions on board the POLAR spacecraft show that the horizontal component of the Poynting flux of auroral hiss changes its direction in good accordance with longitudinal displacements of the bright auroras. The vertical component of the Poynting flux is directed upward from the aurora region, indicating that hiss could be generated by upgoing electron beams. This relationship between hiss and the aurora dynamics means that the upgoing electron beams are closely related to downgoing electron beams which produce the aurora. During the auroral activations the upgoing and downgoing beams move and change their intensities simultaneously.

Keywords. Magnetospheric physics (Auroral phenomena; Plasma waves and instabilities; Storms and substorms)

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