1. Laboratoire de Physique des Plasmas, UMR 7648CNRS/Ecole Polytechnique/UPMC/Univ Paris‐Sud/Obs. de Paris Palaiseau France
2. Now at Scientific Support Office, Directorate of Science and Robotic ExplorationEuropean Space Research and Technology Centre (ESA/ESTEC) Noordwijk Netherlands
3. Laboratoire Atmosphères, Milieux, Observations SpatialesIPSL/CNRS/UVSQ/UPMC Guyancourt France