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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 22, issue 5
Ann. Geophys., 22, 1787–1798, 2004
https://doi.org/10.5194/angeo-22-1787-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 22, 1787–1798, 2004
https://doi.org/10.5194/angeo-22-1787-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.

  08 Apr 2004

08 Apr 2004

On the altitude dependence of transversely heated O+ distributions in the cusp/cleft

M. Bouhram1, B. Klecker1, W. Miyake2, H. Rème3, J.-A. Sauvaud3, M. Malingre4, L. Kistler5, and A. Blăgău6,1 M. Bouhram et al.
  • 1Max-Planck-Institut für extraterrestrische Physik, Gießenbachstraße, D-85741 Garching, Germany
  • 2Communications Research Laboratory, 4-2-1 Koganei, Tokyo 184-8795, Japan
  • 3CESR-CNRS, BP-4346, 31028 Toulouse Cedex 04, France
  • 4CETP-CNRS, 4 Avenue de Neptune, 94100 Saint-Maur Cedex, France
  • 5Space Science Center, University of New Hampshire, Durham, USA
  • 6Space Science Institute, R-76911 Bucharest, Romaniadex, France

Abstract. The present paper focuses on the altitude dependence of oxygen ion conics in the dayside cusp/cleft region. Here, combining oxygen data from the Akebono, Interball-2 and Cluster satellites allows, for the first time, one to follow the global development of energetic (up to ~10keV) ion outflow over a continuous and broad altitude range up to about 5.5 Earth radii (RE). According to earlier statistical studies, the results are consistent with a height-integrated energization of ions at altitudes up to 3.5 RE. Higher up, the results inferred from Cluster observations put forward evidence of a saturation of both a transverse energization rate and ion gyroradii. We suggest that such results may be interpreted as finite perpendicular wavelength effects (a few tens of km) in the wave-particle interactions. To substantiate the suggestion, we carry out two-dimensional, Monte Carlo simulations of ion conic production that incorporate such effects and limited residence times due to the finite latitudinal extent of the heating region.

Key words. Magnetospheric physics (auroral phenomena) – Space plasma physics (charged particle motion and acceleration; wave-particle interactions)

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