[1] Finnish Meteorol Inst, Space Res Unit, FIN-00101 Helsinki, Finland
[2] Ctr Etud Spatiale Rayonnements, F-31028 Toulouse, France
[3] Swedish Inst Space Phys, S-98128 Kiruna, Sweden
[4] SW Res Inst, San Antonio, TX 78220 USA
[5] UCL, Mullard Space Sci Lab, Dorking RH5 6NT, Surrey, England
[6] Univ Michigan, Space Phys Res Lab, Ann Arbor, MI 48109 USA
[7] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA
[8] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA
[9] Univ Arizona, Tucson, AZ 85721 USA
[10] Rutherford Appleton Lab, Didcot OX11 0QX, Oxon, England
[11] Natl Univ Ireland, Space Technol Ltd, Maynooth, Kildare, Ireland
[12] Ist Fis Spazio Interplanetario, I-00133 Rome, Italy
[13] Univ Bern, Inst Phys, CH-3012 Bern, Switzerland
[14] Max Planck Inst Aeron, D-37191 Katlenburg Lindau, Germany
[15] Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan
[16] Tech Univ Braunschweig, D-38106 Braunschweig, Germany
[17] Univ Helsinki, Dept Phys Sci, FIN-00014 Helsinki, Finland