1. Planetary Science Institute; Tucson; Arizona; USA
2. Space Environment Technologies; Altadena; California; USA
3. Laboratory for Atmospheric and Space Physics; University of Colorado at Boulder; Boulder; Colorado; USA
4. Research School of Physics and Engineering; Australian National University; Canberra, ACT; Australia
5. Department of Physics; University of Central Florida; Orlando; Florida; USA
6. Jet Propulsion Laboratory; California Institute of Technology; Pasadena; California; USA
7. Southwest Research Institute; San Antonio; Texas; USA