1. Geospace Physics Laboratory; NASA Goddard Space Flight Center; Greenbelt Maryland USA
2. Department of Atmospheric, Oceanic and Space Sciences; University of Michigan; Ann Arbor Michigan USA
3. The Johns Hopkins University Applied Physics Laboratory; Laurel, Maryland USA
4. Heliophysics Science Division; NASA Goddard Space Flight Center; Greenbelt Maryland USA
5. Laboratory for Atmospheric and Space Physics; University of Colorado Boulder; Boulder Colorado USA
6. Space Science Laboratory; University of California; Berkeley California USA
7. Lamont-Doherty Earth Observatory; Columbia University; Palisades New York USA
8. Department of Terrestrial Magnetism; Carnegie Institution of Washington; Washington District of Columbia USA