1. Division of Geological and Planetary Sciences California Institute of Technology Pasadena CA USA
2. Climate and Space Sciences University of Michigan Ann Arbor MI USA
3. Space Science Southwest Research Institute San Antonio TX USA
4. Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA
5. School of Physics and Astronomy University of Leicester Leicester UK
6. Department of Physics University of Houston Houston TX USA
7. Department of Astronomy Cornell University Ithaca NY USA