1. Department of Astronomy Boston University Boston MA USA
2. Center for Space Physics Boston University Boston MA USA
3. NASA Jet Propulsion Laboratory Pasadena CA USA
4. New Mexico State University/Apache Point Observatory Las Cruces NM USA
5. Space Sciences Laboratory University of California Berkeley CA USA
6. School of Physics and Astronomy University of Leicester Leicester UK
7. Laboratory for Atmospheric and Space Physics University of Colorado Boulder CO USA