1. The Johns Hopkins University Applied Physics Laboratory Laurel MD USA
2. Department of Astrophysical SciencesPrinceton University Princeton USA
3. Southwest Research Institute San Antonio TX USA
4. Department of Physics and AstronomyUniversity of Texas at San Antonio San Antonio TX USA
5. Department of Physics and AstronomyUniversity of Iowa Iowa City IA USA
6. Max Planck Institute for Solar System Research MPS Goettingen Germany
7. Space Sciences LabUniversity of California Berkeley CA USA
8. Laboratory for Atmospheric and Space PhysicsUniversity of Colorado Boulder CO USA