1. Atmospheric Physics Laboratory, Department of Physics and AstronomyUniversity College London London UK
2. Centre for Planetary Sciences at UCL/Birkbeck London UK
3. Physics DepartmentLancaster University Lancaster UK
4. Blackett LaboratoryImperial College London London UK
5. Office of Space Research and TechnologyAcademy of Athens Athens Greece
6. Planetary Science Institute Tucson Arizona USA
7. Mullard Space Science Laboratory, Department of Space and Climate PhysicsUniversity College London Dorking UK