1. Department of PhysicsLancaster University Lancaster UK
2. Mullard Space Science LaboratoryUniversity College London Dorking UK
3. Centre for Planetary Sciences at UCL/Birkbeck London UK
4. Now at Climate and Space Sciences and Engineering, Space Research BuildingUniversity of Michigan Ann Arbor Michigan USA
5. Department of Physics and AstronomyUniversity College London London UK
6. Rutherford Appleton LaboratoryScience and Technology Facilities Council Didcot UK
7. Space Research Centre, Department of Physics and AstronomyUniversity of Leicester Leicester UK
8. Department of Physics and AstronomyUniversity of Leicester Leicester UK
9. Institute of Geophysics and Planetary PhysicsUniversity of California Los Angeles California USA
10. Department of Earth and Space SciencesUniversity of California Los Angeles California USA
11. LESIA Meudon France
12. Arctic Slope Technical Services Beltsville Maryland USA
13. Max‐Planck‐Institut für Sonnensystemforschung Katlenburg‐Lindau Germany
14. The Blackett LaboratoryImperial College London UK
15. The Johns Hopkins Applied Physics Laboratory Laurel Maryland USA