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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 21, issue 4
Ann. Geophys., 21, 881–891, 2003
https://doi.org/10.5194/angeo-21-881-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 21, 881–891, 2003
https://doi.org/10.5194/angeo-21-881-2003
© Author(s) 2003. This work is distributed under
the Creative Commons Attribution 3.0 License.

  30 Apr 2003

30 Apr 2003

Generation of Bernstein waves by ion shell distributions in the auroral region

P. Janhunen1, A. Olsson2, A. Vaivads2, and W. K. Peterson3 P. Janhunen et al.
  • 1Finnish Meteorological Institute, Geophysical Research, Helsinki, Finland
  • 2Swedish Institute of Space Physics, Uppsala Division, Uppsala, Sweden
  • 3LASP, University of Colorado, Boulder, Colorado, USA

Abstract. Hot ion shell distributions could possibly contain enough free energy for waves that could power electron energisation above auroral inverted-V regions. Using both linear theory (WHAMP) and two-dimensional electrostatic simulations, we show that ion shell distributions can cause unstable ion Bernstein mode emissions with high temporal growth rates, as well as perpendicular and parallel e-folding distances, that are in accordance with the tranverse dimensions of auroral arcs and the parallel size of the energisation region, respectively. The phase velocities of the waves are in the proper range to give parallel energisation to electrons with a Landau resonance. The simulation shows that about 90% of the energy goes into electrons and 10% goes into cold ion perpendicular heating. An electron heating rate of ~ 80 eV/s is obtained.

Key words. Ionosphere (auroral phenomena) – Space plasma physics (numerical simulation studies; wave-particle interactions)

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