1. INAF-Istituto di Astrofisica e Planetologia Spaziali Via Fosso del Cavaliere 100, 00133 Rome, Italy
2. Physikalisches Institut, der Universität Bonn, Nussallee 12, 53115 Bonn, Germany
3. Graduate School of Advanced Science and Engineering, Hiroshima University, 1-3-1, Kagamiyama, Higashi-Hiroshima 739-8526, Japan
4. Dipartimento di Fisica e Astronomia “Galileo Galilei”, Universitá degli Studi di Padova, Via VIII febbraio 2, 35122 Padova, Italy
5. NASA Marshall Space Flight Center, 320 Sparkman Drive, Huntsville, AL 35805, USA
6. Dipartimento di Fisica, Universitá degli Studi di Roma “La Sapienza”, Piazzale Aldo Moro 5, 00185 Roma, Italy
7. Dipartimento di Fisica, Universitá degli Studi di Roma “Tor Vergata”, Via della Ricerca Scientifica 1, 00133 Roma, Italy
8. Department of Physics and Astronomy and Space Science Center, University of New Hampshire, Morse Hall, 8 College Rd, Durham, NH 03824, USA
9. Physics Department, Washington University in Saint Louis, 1 Brookings Dr, St. Louis, MO 63130, USA
10. Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139, USA
11. NASA Goddard Space Flight Center, 8800 Greenbelt Rd, Greenbelt, MD 20771, USA
12. KTH Royal Institute of Technology, Department of Physics, 106 91 Stockholm, Sweden
13. The Oskar Klein Centre for Cosmoparticle Physics, AlbaNova University Centre, 106 91 Stockholm, Sweden