Pierre Leon Rochus, Université de Liège, Liege, Belgium, Frederic Auchere, IAS Institut d'Astrophysique Spatiale, Orsay Cedex, France, David Berghmans, Royal Observatory of Belgium, Uccle, Belgium, Louise Harra, UCL-Mullard Space Science Laboratory, Holmbury St Mary, United Kingdom, Werner K Schmutz, PMOD WRC Physical Meteorological Observatory Davos and World Radiation Center, Davos Dorf, Switzerland and Udo Schühle, Max Planck Institute for Solar System Research, Göttingen, Germany