1. Mullard Space Science Laboratory; University College London; Dorking UK
2. NASA Goddard Space Flight Center; Greenbelt Maryland USA
3. British Antarctic Survey; Cambridge UK
4. Space Science Center; University of New Hampshire; Durham New Hampshire USA
5. New Mexico Consortium; Los Alamos New Mexico USA
6. School of Physics and Astronomy; University of Southampton; Southampton UK
7. Department of Meteorology; University of Reading; Reading UK