Centre Etude Spatiale des Rayonnements, CESR/CNRS, 9 Av. Colonel Roche BP 4346, Toulouse, 31028 France
Institute of Geophysics and Planetary Physics, UCLA, 405 Hilgard Avenue, Los Angeles, CA 90095-1567, USA; Department of Physics, UCLA, 405 Hilgard Avenue, Los Angeles, CA 90095-1547, USA
Institute of Geophysics and Planetary Physics, UCLA, 405 Hilgard Avenue, Los Angeles, CA 90095-1567, USA
Institute of Geophysics and Planetary Physics, UCLA, 405 Hilgard Avenue, Los Angeles, CA 90095-1567, USA
Institute of Geophysics and Planetary Physics, UCLA, 405 Hilgard Avenue, Los Angeles, CA 90095-1567, USA
Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT United Kingdom
Space Physics Division, SST Department, CCLRC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX11 0QX United Kingdom
Max-Planck-Institut für extraterrestrische Physik, Garching bei München, 85748 Germany