1. Space Science Center; University of New Hampshire; Durham New Hampshire USA
2. Air Force Research Laboratory; Hanscom Air Force Base; Bedford Massachusetts USA
3. Department of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
4. Space Sciences Laboratory; University of California; Berkeley California USA
5. Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA
6. Centre d'Etude Spatiale des Rayonnements, CNRS; Toulouse France
7. Applied Research Associates, Inc.; Nashua New Hampshire USA