1. UCL Mullard Space Science Laboratory; Dorking UK
2. Department of Meteorology; University of Reading; Reading UK
3. British Antarctic Survey; Cambridge UK
4. Space Research Institute; Austrian Academy of Sciences; Graz Austria
5. Institut de Recherche en Astrophysique et Planétologie; University of Toulouse; Toulouse France
6. CNRS, IRAP; Toulouse France
7. Space Science Centre, Morse Hall; University of New Hampshire; Durham New Hampshire USA
8. School of Physics & Astronomy; University of Southampton; Southampton UK
9. Department Physics and Astronomy; University of Leicester; Leicester UK
10. Department of Physics; Imperial College London; London UK