[1] Mullard Space Science Laboratory, Department of Space and Climate Physics, University College London, Holmbury St. Mary, Dorking RH5 6NT, United Kingdom
[2] Centre for Planetary Sciences, UCL/Birkbeck, London, United Kingdom
[3] Space and Atmospheric Physics Group, Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2AZ, United Kingdom
[4] Institute for Research in Electronics and Applied Physics, University of Maryland, Energy Research Building, College Park, MD 20742-3511, United States
[5] Space Science and Applications, Los Alamos National Laboratory, Los Alamos, NM 87545, United States
[6] Institute of Geophysics and Planetary Physics, University of California, 3845 Slichter Hall, 603 Charles Young Dr. East, Los Angeles, CA 90095, United States
[7] Office of Space Research and Technology, Academy of Athens, Soranou Efesiou 4, Athens GR-11527, Greece
[8] Space Science and Engineering Division, Southwest Research Institute, PO Drawer 28510, San Antonio, TX 78228, United States
[9] Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Rd., Laurel, MD 20723, United States
[10] JAXA Institute of Space and Astronautical Science, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210, Japan