1. NASA Goddard Space Flight Center; Greenbelt MD USA
2. Department of Physics; Catholic University of America; Washington DC USA
3. Bartol Research Institute; University of Delaware; Newark DE USA
4. Rostov State University; Rostov-on-Don Russia
5. Space Research Institute; Moscow Russia
6. Centre d'Etude Spatiale des Rayonnements; Toulouse France
7. Space Science Laboratory; University of California; Berkeley CA USA
8. Department of Physics and Astronomy; Rice University; Houston TX USA
9. Jet Propulsion Laboratory; Pasadena CA USA