1. Department of Geosciences; Stony Brook University; Stony Brook New York USA
2. Atmospheric, Oceanic and Planetary Physics, Department of Physics; Oxford University; Oxford UK
3. Hawaii Institute of Geophysics and Planetology; University of Hawaii; Honolulu Hawaii USA
4. Jet Propulsion Laboratory; Pasadena California USA
5. Royal Belgian Institute for Space Aeronomy; Brussels Belgium
6. The Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA