1. Institute of Atmospheric Physics; Academy of Sciences of the Czech Republic; Prague Czech Republic
2. Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique; Observatoire de Paris, Centre National de la Recherche Scientifique, Université Pierre et Marie Curie, Université Paris Diderot; Meudon France
3. Astronomical Institute; Academy of Sciences of the Czech Republic; Prague Czech Republic
4. Department for Sun and Heliosphere; Max Planck Institute for Solar System Research; Katlenburg-Lindau Germany
5. Mullard Space Science Laboratory; University College London; Dorking UK
6. Department of Physics; West Virginia University; Morgantown West Virginia USA