1. The Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
2. Departments of Physics and Astronomy; University of Leicester; Leicester UK
3. Southwest Research institute; San Antonio Texas USA
4. Departments of Physics and Astronomy; University of Texas at San Antonio; San Antonio Texas USA
5. Laboratory for Atmospheric and Space Physics; University of Colorado Boulder; Boulder Colorado USA
6. NASA Goddard Space Flight Center; Greenbelt Maryland USA
7. Departments of Physics and Astronomy; University of Iowa; Iowa City Iowa USA
8. Jet Propulsion Laboratory; Pasadena California USA
9. Department of Astrophysical Sciences; Princeton University; Princeton New Jersey USA
10. Institute for Geophysics and Meteorology; University of Cologne; Cologne Germany