1. Centre d'Etude Spatiale des Rayonnements; Toulouse Cedex 4 France
2. Imperial College; London UK
3. Space Science Laboratory; UC Berkeley CA USA
4. Swedish Institute of Space Physics; Kiruna Sweden
5. Mullard Space Science Laboratory; Surrey UK
6. ESA/ESTEC RSSD; Noordwijk The Netherlands
7. University of New Hampshire; Durham USA
8. Instituto di Fisica dello Spazio Interplanetario; Roma Italy
9. Max-Planck-Institut für Aeronomie; Katlenburg-Lindau Germany
10. Max-Planck-Institut für Extraterrestrische Physik; Garching Germany