1. Max‐Planck‐Institut für Sonnensystemforschung Göttingen Germany
2. Institut de Recherche en Astrophysique et Planetologie, CNRS, CNES, UPS Toulouse France
3. School of Earth and Atmospheric Sciences, Georgia Institute of Technology Atlanta GA USA
4. Space Sciences Laboratory, University of California Berkeley CA USA
5. The Johns Hopkins University Applied Physics Laboratory Laurel MD USA
6. Institute of Geophysics and Planetary PhysicsUniversity of California Los Angeles Los Angeles CA USA
7. Mullard Space Science LaboratoryUniversity College London Dorking UK