1. Department of Physics; University of Oslo; Oslo Norway
2. Swedish Institute of Space Physics; Uppsala Sweden
3. RSSD; ESTEC; Noordwijk Netherlands
4. Space Science Laboratory; University of California; Berkeley California USA
5. Division of Plasma Physics, Alfven Laboratory; Royal Institute of Technology; Stockholm Sweden
6. Laboratoire de Physique et Chimie de l'Environnement; LPCE/CNRS; Orléans France
7. CESR/CNRS; Toulouse France
8. Department of Physics, Mullard Space Science Laboratory; University College London; Dorking UK
9. MPI fur Extraterrestrische Physik; Garching Germany
10. Division of Electronics; Norwegian Defence Research Establishment; Kjeller Norway
11. Space Research Institute; Austrian Academy of Sciences; Graz Austria
12. Geophysics Department; University of Washington; Seattle Washington USA