1. Max Planck Institute for Solar System Research; Göttingen Germany
2. Department of Earth and Environmental Sciences; Ludwig Maximilian University of Munich; Munich Germany
3. Department of Climate and Space; University of Michigan; Ann Arbor Michigan USA
4. Department of Physics; University of New Hampshire; Durham New Hampshire USA
5. Space Research Institute; Russian Academy of Sciences; Moscow Russia
6. Max Planck Institute for Extraterrestrial Physics; Garching Germany
7. University of Toulouse, UPS-OMP, UMR 5277, Institut de Recherche en Astrophysique et Planátologie; Toulouse France
8. CNRS, IRAP; Toulouse France