1. Laboratory for Atmospheric and Space PhysicsUniversity of Colorado Boulder Boulder CO USA
2. Department of Earth, Planetary, and Space SciencesUniversity of California Los Angeles CA USA
3. Space Sciences LaboratoryUniversity of California Berkeley CA USA
4. Applied Physics LaboratoryThe Johns Hopkins University Laurel MD USA
5. Department of Astrophysical Sciences and Princeton Plasma Physics LaboratoryPrinceton University Princeton NJ USA