1. INAF Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Capodimonte, 80131 Napoli, Italy
2. ASI - Italian Space Agency, Via del Politecnico, s.n.c 00133—Rome, Italy
3. Space Science Division, Code 7684, Naval Research Laboratory, Washington, DC 20375, USA
4. University College London, Mullard Space Science Laboratory, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, United Kingdom
5. Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University Belfast, University Road, Belfast, BT7 1NN, Northern Ireland, United Kingdom
6. Department of Physics and Astronomy, George Mason University, 4400 University Drive, Fairfax, Virginia 22030, USA
7. Max Planck Institute for Solar System Research, Justus-von-Liebig-Weg 3, 37077 Göttingen, Germany
8. Niels Bohr International Academy, Niels Bohr Institute, Blegdamsvej 17, DK-2100 Copenhagen, Denmark
9. Department of Physics and Astronomy, California State University Northridge, Northridge, California 91330, USA