1. Department of Astrophysical and Planetary Sciences; University of Colorado Boulder; Boulder Colorado USA
2. Southwest Research Institute; San Antonio Texas USA
3. Department of Physics; University of New Hampshire; Durham New Hampshire USA
4. Swedish Institute of Space Physics; Uppsala Sweden
5. Royal Institute of Technology; Stockholm Sweden
6. Department of Earth, Planetary and Space Science; University of California; Los Angeles California USA
7. Space Research Institute; Austrian Academy of Sciences; Graz Austria
8. NASA Goddard Space Flight Center; Greenbelt Maryland USA