Swedish Institute of Space Physics, Box 537, Uppsala, SE-751 21 Sweden
Swedish Institute of Space Physics, Box 537, Uppsala, SE-751 21 Sweden
Swedish Institute of Space Physics, Box 537, Uppsala, SE-751 21 Sweden
Swedish Institute of Space Physics, Box 537, Uppsala, SE-751 21 Sweden
University of Alaska, Geophysical Institute, Fairbanks, AK 99775, USA
Imperial College London, Space and Atmospheric Physics Group, Blacket Laboratory Space and Atmospheric Physics Group, Blacket Laboratory, London, SW7 2BW4 United Kingdom
Imperial College London, Space and Atmospheric Physics Group, Blacket Laboratory Space and Atmospheric Physics Group, Blacket Laboratory, London, SW7 2BW4 United Kingdom
Imperial College London, Space and Atmospheric Physics Group, Blacket Laboratory Space and Atmospheric Physics Group, Blacket Laboratory, London, SW7 2BW4 United Kingdom
Mullard Space Science Laboratory Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey10, RH5 6NT United Kingdom
Mullard Space Science Laboratory Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey10, RH5 6NT United Kingdom
Institut Pierre Simon Laplace, CNRS, V?elizy-Villacoublay, 78140 France
University of Iowa, Department of Physics and Astronomy, Iowa City, IA 52242, USA
Köln University, Institute for Geophysics and Meteorology, Köln, D-50923 Germany
University of Kansas, Department of Physics and Astronomy, Lawrence7, KS 66045, USA
University of Michigan, Department of Atmospheric, Oceanic and Space Sciences, Ann Arbor, MI 481099, USA
University of Arizona, Lunar and Planetary Laboratory, Tucson, AZ 85721, USA
Southwest Research Institute, Department of Physics, San Antonio, TX 78238, USA