1. Laboratoire de Planétologie de Grenoble; CNRS, UJF; Grenoble France
2. Rutherford Appleton Laboratory; Didcot UK
3. Max-Planck-Institut für extraterrestrische Physik; Garching Germany
4. Institute for Space Sciences; Bucharest Romania
5. Mullard Space Science Laboratory, Department of Space and Climate Physics; University College London; Dorking UK
6. European Space Agency; Noordwijk Netherlands
7. Space and Atmospheric Physics Group; Imperial College London; London UK
8. Centre d'Etude Spatiale des Rayonnements; CNRS, UPS; Toulouse France