1. Max Planck Institute for Solar System Research Göttingen Germany
2. Space Research Institute Russian Academy of Sciences Moscow Russia
3. Birkeland Centre for Space Science, Department of Physics University of Bergen Bergen Norway
4. Laboratoire de Physique des Plasmas Palaiseau Cedex France
5. Key Laboratory of Ionospheric Environment, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China
6. Department of Physics Space Science Center University of New Hampshire Durham New Hampshire USA
7. University of Toulouse, UPS‐OMP, UMR 5277 Institut de Recherche en Astrophysique et Planátologie Toulouse France
8. CNRS, IRAP Toulouse France