1. Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139–4307, USA.
2. Planetary Science Directorate, Southwest Research Institute, Boulder, CO 80302, USA.
3. Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015, USA.
4. Department of Earth, Environmental, and Planetary Sciences, Case Western Reserve University, Cleveland, OH 44106, USA.
5. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA.
6. Department of Physics, University of California, Santa Barbara, CA 93106, USA.
7. Department of Earth and Space Sciences, University of California, Los Angeles, CA 90095, USA.
8. Department of Earth and Ocean Sciences, University of British Columbia, Vancouver, BC, V6T 1Z4 Canada.
9. Planetary Science Institute, 1700 East Fort Lowell, Suite 106, Tucson, AZ 85719, USA.
10. Stinger Ghaffarian Technologies, Inc., 7701 Greenbelt Rd., Greenbelt, MD 20770, USA.
11. Johns Hopkins University, Applied Physics Laboratory, Laurel, MD 20723, USA.
12. University of Maryland, Baltimore County, Baltimore, MD 21250, USA.
13. Department of Geological Sciences, Brown University, Providence, RI 02912, USA.
14. KinetX, Inc., Tempe, AZ 85284, USA.