1. Space Research Institute, Austrian Academy of Sciences, Graz, Austria.
2. Polar Geophysical Institute, Russian Academy of Sciences, Murmansk, Russian Federation.
3. Institute for Theoretical Physics, Technical University of Braunschweig, Braunschweig, Germany.
4. Present address: LESIA, CNRS-Observatoire de Paris, Meudon, France.
5. National Institute of Information and Communications Technology, Tokyo, Saitama, Japan.
6. CREST, Japan Science and Technology Agency, Saitama, Japan.
7. Institute of Computational Modelling, Russian Academy of Sciences, Krasnoyarsk, Russian Federation.
8. Institute for Physics, University of Graz, Graz, Austria.
9. Institut d'Estudis Espacials de Catalunya, Barcelona, Spain.
10. Instituto de Ciencias del Espacio, Barcelona, Spain.
11. Centre de Recherche en Astrophysique de Lyon
12. École Normale Supérieure, Lyon, France.