[1] Univ Padua, Ctr Ateneo Studi & Att Spaziali Giuseppe Colombo, Via Venezia 15, I-35131 Padua, Italy
[2] Royal Observ Belgium, 3 Ave Circulaire, B-1180 Brussels, Belgium
[3] Open Univ, Sch Phys Sci, Walton Hall, Milton Keynes MK7 6AA, Bucks, England
[4] UPMC Univ Paris 06, Sorbonne Univ, Lab Meteorol Dynam, Inst Pierre Simon Laplace,CNRS, 4 Pl Jussieu, F-75005 Paris, France
[5] Univ Padua, Dept Ind Engn, Via Venezia 1, I-35131 Padua, Italy
[6] Finnish Meteorol Inst, Erik Palmenin Aukio 1,POB 503, FIN-00101 Helsinki, Finland
[7] Imperial Coll London, Prince Consort Rd, London SW7 2AZ, England
[8] Int Res Sch Planetary Sci, Viale Pindaro 42, Pescara, Italy
[9] Von Karman Inst, 72 Chaussee Waterloo, B-1640 Rhode St Genese, Belgium
[10] NASA, Langley Res Ctr, Hampton, VA 23681 USA
[11] Univ Cologne, Inst Geophys & Meteorol, Albertus Magnus Pl, D-50923 Cologne, Germany
[12] Curtin Univ, Dept Appl Geol, GPO Box U1987, Perth, WA 6845, Australia
[13] Boston Univ, 725 Commonwealth Ave, Boston, MA 02215 USA
[14] CALTECH, Jet Prop Lab, NASA, Pasadena, CA USA
[15] Tech Univ Dresden, Helmholtzstr 10, D-01069 Dresden, Germany