1. EOS Group; Department of Physics and Astronomy, University of Leicester; Leicester UK
2. Belgian Institute for Space Aeronomy (BIRA-IASB); Brussels Belgium
3. Harvard-Smithsonian Center for Astrophysics; Cambridge Massachusetts USA
4. Now at Jet Propulsion Laboratory; Pasadena California USA
5. Department of Physical Geography and Ecosystems Analysis; Geobiosphere Science Center, Lund University; Lund Sweden
6. Atmospheric Environmental Research/Institute of Meteorology and Climate Research; Karlsruhe Institute of Technology; Karlsruhe Germany
7. National Center of Atmospheric Research; Boulder Colorado USA
8. Earth and Planetary Sciences; Harvard University; Cambridge Massachusetts USA
9. Geophysical Fluid Dynamics Laboratory; Princeton University; Princeton New Jersey USA