1. Department of Earth, Environmental, and Planetary Sciences; Case Western Reserve University; Cleveland Ohio USA
2. Department of Physics and Astronomy; University of California, Los Angeles; Los Angeles California USA
3. Department of Earth and Space Sciences; University of California, Los Angeles; Los Angeles California USA
4. Department of Terrestrial Magnetism; Carnegie Institution of Washington; Washington D.C. USA
5. Lamont-Doherty Earth Observatory; Columbia University; Palisades New York USA
6. Planetary Science Directorate; Southwest Research Institute; Boulder Colorado USA
7. Department of Earth, Ocean, and Atmospheric Sciences; University of British Columbia; Vancouver British Columbia Canada
8. Planetary Science Institute; Tucson Arizona USA
9. NASA Goddard Space Flight Center; Greenbelt Maryland USA
10. Department of Earth, Atmospheric, and Planetary Sciences; Massachusetts Institute of Technology; Cambridge Massachusetts USA
11. Department of Mineral Sciences, National Museum of Natural History; Smithsonian Institution; Washington D.C. USA
12. Department of Physics; University of California; Santa Barbara California USA
13. Space Department; The Johns Hopkins Applied Physics Laboratory; Laurel Maryland USA