1. Space Research Institute; Austrian Academy of Sciences; Graz Austria
2. Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA
3. Institut für Geophysik und Extraterrestrische Physik; Technische Universität Braunschweig; Braunschweig Germany
4. Max Planck Institute of Solar System Research; Katlenburg-Lindau Germany
5. Space Sciences Laboratory; University of California; Berkeley California USA
6. Los Alamos National Laboratory; Los Alamos New Mexico USA
7. Space Environment Research Center; Kyushu University; Fukuoka Japan
8. Space and Atmospheric Physics Group; Imperial College; London UK
9. Centre d'Etude Spatiale des Rayonnements; Université Paul Sabatier, UMR 5187, CNRS; Toulouse France