[1
]Southwest Research Institute; San Antonio Texas USA
[2
]Department of Physics and Astronomy; University of Texas at San Antonio; San Antonio
Texas USA
[3
]Now at The Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
[4
]Lockheed Martin Advanced Technology Center; Palo Alto California USA
[5
]Laboratory for Atmospheric and Space Physics; University of Colorado Boulder; Boulder
Colorado USA
[6
]Department of Physics and Astronomy; West Virginia University; Morgantown West Virginia
USA
[7
]Goddard Space Flight Center; Greenbelt Maryland USA
[8
]Astronomy Department; University of Maryland; College Park Maryland USA
[9
]Swedish Institute of Space Physics; Uppsala Sweden
[10
]Institut de Recherche en Astrophysique et Plantologie; Université de Toulouse; Toulouse
France
[11
]Centre National de la Recherche Scientifique; Toulouse France
[12
]Space Science Laboratory; University of California; Berkeley California USA
[13
]Institute for Geophysics and Planetary Physics; University of California; Los Angeles
California USA
[14
]Space Science Center; University of New Hampshire; Durham New Hampshire USA
[15
]Physics and Astronomy; Rice University; Houston Texas USA