1. School of Physics and Astronomy; University of Minnesota; Minneapolis Minnesota USA
2. Space Sciences Laboratory; University of California; Berkeley California USA
3. Blackett Laboratory; Imperial College; London UK
4. Swedish Institute of Space Physics; Uppsala Division; Uppsala Sweden
5. Centre d'Etude Spatiale des Rayonnements; Toulouse France
6. NASA Goddard Space Flight Center; Greenbelt Maryland USA
7. University of New Hampshire; Durham New Hampshire USA