University of Kansas, Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045, USA
University of Kansas, Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045, USA
Southwest Research Institute, Southwest Research Institute, P.O. Drawer 28510, San Antonio, TX 78228-0510, USA
NASA Goddard Space Flight Center, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
University of Arizona, Lunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721-0092, USA
University of Arizona, Lunar and Planetary Laboratory, University of Arizona, 1629 E. University Blvd., Tucson, AZ 85721-0092, USA
University of Kansas, Department of Physics and Astronomy, University of Kansas, Lawrence, KS 66045, USA
University of California, Berkeley, Space Sciences Laboratory, University of California, Berkeley, Berkeley, CA 94720, USA
University of California, Berkeley, Space Sciences Laboratory, University of California, Berkeley, Berkeley, CA 94720, USA
Applied Physics Laboratory, John Hopkins University, Applied Physics Laboratory, Johns Hopkins University, Laurel, MD 20723, USA
National Central University, Instit. of Astronomy and Space Sci., National Central University, Chung-Li, TWN 32054 Taiwan
Imperial College, Space and Atmospheric Physics Group, Imperial College, London, SW7 2BW United Kingdom
Swedish Institute of Space Physics, Swedish Institute of Space Physics Uppsala Division, Swedish Institute of Space Physics Uppsala Division, Box 537, Uppsala, SE-751 21 Sweden
University College London, Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, RH5 6NT Bulgaria