1. NASA GSFC; Laboratory for Extraterrestrial Physics; Greenbelt Maryland USA
2. Mullard Space Science Laboratory; Holmbury St. Mary; Dorking, Surrey England UK
3. Rutherford Appleton Laboratory; Chilton, Didcot, Oxfordshire England UK
4. Swedish Institute of Space Physics; Uppsala Sweden
5. Earth and Space Sciences Department; University of California; Los Angeles California USA
6. Space and Atmospheric Physics; Imperial College; London England UK
7. Institut für Geophysik und Meteorologie; Technische Universität Braunschweig; Braunschweig Germany
8. Centre d'Etude Spatiale des Rayonnements; Toulouse France