1. Space Radiation Laboratory; California Institute of Technology; Pasadena California USA
2. Laboratory for Atmospheric and Space Physics; University of Colorado at Boulder; Boulder Colorado USA
3. Applied Physics Laboratory; Johns Hopkins University; Laurel Maryland USA
4. Center for Space Plasma and Aeronomy Research; University of Alabama in Huntsville; Huntsville Alabama USA
5. Space Sciences Laboratory; University of California; Berkeley California USA
6. Centre d'Etude Spatiale des Rayonnements; Université de Toulouse; Toulouse France
7. Centre National de la Recherche Scientifique, UMR 5187; Toulouse France
8. Institute of Geophysics and Planetary Physics; University of California; Los Angeles California USA