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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 20, issue 10
Ann. Geophys., 20, 1603–1616, 2002
https://doi.org/10.5194/angeo-20-1603-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 20, 1603–1616, 2002
https://doi.org/10.5194/angeo-20-1603-2002
© Author(s) 2002. This work is distributed under
the Creative Commons Attribution 3.0 License.

  31 Oct 2002

31 Oct 2002

A hybrid simulation model for a stable auroral arc

P. Janhunen1 and A. Olsson2 P. Janhunen and A. Olsson
  • 1Finnish Meteorological Institute, Geophysical Research, Helsinki, Finland
  • 2Swedish Institute of Space Physics, Uppsala Division, Uppsala, Sweden
  • Correspondence to: P. Janhunen (pekka.janhunen@fmi.fi)

Abstract. We present a new type of hybrid simulation model, intended to simulate a single stable auroral arc in the latitude/altitude plane. The ionospheric ions are treated as particles, the electrons are assumed to follow a Boltzmann response and the magnetospheric ions are assumed to be so hot that they form a background population unaffected by the electric fields that arise. The system is driven by assumed parallel electron energisation causing a primary negative charge cloud and an associated potential structure to build up. The results show how a closed potential structure and density depletion of an auroral arc build up and how they decay after the driver is turned off. The model also produces upgoing energetic ion beams and predicts strong static perpendicular electric fields to be found in a relatively narrow altitude range (~ 5000–11 000 km).

Key words. Magnetospheric physics (magnetosphere-ionosphere interactions; auroral phenomena) – Space plasma physics (numerical simulation studies)

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