Space & Atmospheric Physics Group, Imperial College London, The Blackett Laboratory Prince Consort Road, London, SW72BZ United Kingdom
Institut für Geophysik und Meteorologie, University of Cologne Albertus-Magnus-Platz, Cologne, 50931 Germany
Space & Atmospheric Physics Group, Imperial College London, The Blackett Laboratory Prince Consort Road, London, SW72BZ United Kingdom
Space & Atmospheric Physics Group, Imperial College London, The Blackett Laboratory Prince Consort Road, London, SW72BZ United Kingdom; Swedish Institute of Space Physics, Ångströmlaboratoriet, Lägerhyddsv. 1, Uppsala, SE-751 21 Sweden
Swedish Institute of Space Physics, Ångströmlaboratoriet, Lägerhyddsv. 1, Uppsala, SE-751 21 Sweden
KFKI Research Institute for Particle and Nuclear Physics, 29-33 Konkoly Thege street, Budapest, H-1121 Hungary
Mullard Space Science Laboratory, Holmbury St. Mary, Surrey, RH5 6NT United Kingdom
Southwest Research Institute, 6220 Culebra Road, San Antonio, TX 78228-0510, USA
Space & Atmospheric Physics Group, Imperial College London, The Blackett Laboratory Prince Consort Road, London, SW72BZ United Kingdom
Institute of Geophysics and Planetary Physics, UCLA, Los Angeles, CA 90024-1, USA
Space & Atmospheric Physics Group, Imperial College London, The Blackett Laboratory Prince Consort Road, London, SW72BZ United Kingdom