1. Heliophysics Sciences Division; NASA Goddard Space Flight Center; Greenbelt Maryland USA
2. Applied Physics Laboratory; Johns Hopkins University; Laurel Maryland USA
3. Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA
4. Space Sciences Laboratory; University of California; Berkeley California USA
5. Space Physics Laboratory; Lockheed Martin Advanced Technology Center; Palo Alto California USA
6. Department of Space and Atmospheric Physics; Imperial College London; London UK
7. Centre d'Etude Spatiale des Rayonnements; Toulouse France