1. Laboratoire de Physique et Chimie de l'Environnement, CNRS; Université d'Orléans; Orleans France
2. le Studium Institute for Advanced Studies; Orleans France
3. Centre d'Etude Spatiale des Ryonnements; CNRS; Toulouse France
4. Space and Atmospheric Physics, Blackett Laboratory; Imperial College London; London UK
5. Space Science and Technology Department; Rutherford Appleton Laboratory; Didcot UK