Nicolas Andre, CNRS, Paris Cedex 16, France, Sae Aizawa, IRAP, Toulouse, France, Ronan Modolo, UVSQ / LATMOS-IPSL/CNRS-INSU, Guyancourt, France, Francois Leblanc, LATMOS Laboratoire Atmosphères, Milieux, Observations Spatiales, Paris Cedex 05, France, Elisabeth Werner, LATMOS, Paris, France and Vincent N Genot, IRAP / CNRS / UPS, PEPS, Toulouse, France