[1] Finnish Meteorol Inst, FIN-00101 Helsinki, Finland
[2] Austrian Acad Sci, Space Res Inst, A-8042 Graz, Austria
[3] Swedish Inst Space Phys, SE-98128 Kiruna, Sweden
[4] Ctr Etud Spatiale Rayonnements, F-31028 Toulouse, France
[5] Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan
[6] UCL, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England
[7] Univ Arizona, Tucson, AZ 85721 USA
[8] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England
[9] Univ Helsinki, Dept Phys Sci, FIN-00014 Helsinki, Finland
[10] Univ Michigan, Space Phys Res Lab, Ann Arbor, MI 48109 USA
[11] Max Planck Inst Sonnensyst Forsch, D-37191 Katlenburg Lindau, Germany
[12] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA
[13] Natl Univ Ireland, Space Technol Ireland, Maynooth, Kildare, Ireland
[14] Inst Fis Spazio Interplanetari, I-00133 Rome, Italy
[15] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA
[16] Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90095 USA
[17] KFKI Res Inst Particle & Nucl Phys, H-1525 Budapest, Hungary
[18] SW Res Inst, San Antonio, TX USA
[19] Univ Bern, Inst Phys, CH-3012 Bern, Switzerland
[20] W Virginia Univ, Dept Phys, Morgantown, WV 26506 USA