1. Department of Physics and AstronomyUniversity of Florence Sesto Fiorentino Italy
2. INFN, Sezione di Florence Sesto Fiorentino Italy
3. Department of PhysicsUniversity of Naples Federico II Naples Italy
4. INFN, Sezione di Naples Naples Italy
5. Lebedev Physical Institute Moscow Russia
6. Department of PhysicsUniversity of Bari Bari Italy
7. INFN, Sezione di Bari Bari Italy
8. INFN, Sezione di Trieste Trieste Italy
9. Ioffe Physical Technical Institute St. Petersburg Russia
10. KTH, Department of Physics, and the Oskar Klein Centre for Cosmoparticle PhysicsAlbaNova University Centre Stockholm Sweden
11. INFN, Sezione di Roma Tor Vergata Rome Italy
12. RIKEN, Advanced Science Institute Wako Japan
13. IFAC Sesto Fiorentino Italy
14. Department of PhysicsUniversity of Rome Tor Vergata Rome Italy
15. Heliophysics DivisionNASA Goddard Space Flight Center Greenbelt Maryland USA
16. Agenzia Spaziale Italiana Science Data Center Rome Italy
17. National Research Nuclear University MEPhI Moscow Russia
18. INFN, Laboratori Nazionali di Frascati Frascati Italy
19. Department of PhysicsUniversität Siegen Siegen Germany
20. Department of PhysicsUniversity of Trieste Trieste Italy
21. Indian Centre for Space Physics Calcutta India
22. Formerly at INFN, Sezione di Trieste Trieste Italy
23. 23 IAPS/INAF I‐00133 Rome Italy