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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 23, issue 12
Ann. Geophys., 23, 3715–3725, 2005
https://doi.org/10.5194/angeo-23-3715-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 23, 3715–3725, 2005
https://doi.org/10.5194/angeo-23-3715-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.

  23 Dec 2005

23 Dec 2005

Electron-scale sheets of whistlers close to the magnetopause

G. Stenberg1, T. Oscarsson1, M. André2, A. Vaivads2, M. Morooka2, N. Cornilleau-Wehrlin3, A. Fazakerley4, B. Lavraud5, and P. M. E. Décréau6 G. Stenberg et al.
  • 1Department of Physics, Umeå University, Umeå, Sweden
  • 2Swedish Institute of Space Physics, Uppsala, Sweden
  • 3CETP/UVSQ, Vélizy, France
  • 4MSSL, University College, London, UK
  • 5CESR, Toulouse, France
  • 6LPCE et Université d’Orléans, France

Abstract. Whistler emissions close to the magnetopause on the magnetospheric side are investigated using the four Cluster spacecraft. The waves are found to be generated in thin (electron-scale) sheets moving with the plasma drift velocity. A feature in the electron data coincides with the waves; hot magnetospheric electrons disappear for a few satellite spins. This produces or enhances a temperature anisotropy, which is found to be responsible for the generation of the whistler mode waves. The high energy electrons are thought to be lost through the magnetopause and we suggest that the field lines, on which the waves are generated, are directly connected to a reconnection diffusion region at the magnetopause.

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