1. Instituto de Astrofísica de Andalucía-CSIC; Granada Spain
2. LATMOS; CNRS; Paris France
3. Laboratoire de Météorologie Dynamique; CNRS; Paris France
4. Laboratory for Atmospheric and Space Physics; University of Colorado Boulder; Boulder CO USA
5. Space Sciences, Technologies and Astrophysics Research Institute; Université de Liège; Liège Belgium