1. Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
2. Mullard Space Science Laboratory; University College London; Holmbury St. Mary UK
3. Centre for Planetary Sciences at UCL/Birkbeck; London WC1E 6BT UK
4. Department of Space and Atmospheric Physics; Imperial College; London UK
5. LESIA, CNRS; Observatoire de Meudon; Meudon France
6. Applied Physics Laboratory; Johns Hopkins University; Laurel Maryland USA
7. Centre d'Étude Spatiale des Rayonnements; Université de Toulouse, UPS; Toulouse France
8. CNRS UMR 5187; Toulouse France
9. Max-Planck-Institut fur Sonnensystemforschung; Katlenburg-Lindau Germany
10. Southwest Research Institute; San Antonio Texas USA