1. Department of Physics and Astronomy; University of Leicester; Leicester UK
2. Mullard Space Science Laboratory; University College London; Dorking UK
3. Center for Space Physics; Boston University; Boston Massachusetts USA
4. Blackett Laboratory; Imperial College; London UK
5. Laboratoire de Physique Atmosphérique et Planétaire; Université de Liège; Liège Belgium
6. Department of Atmospheric, Oceanic, and Space Sciences; University of Michigan; Ann Arbor Michigan USA
7. European Space Agency, HQ; Paris France