1. Department of Space Physics, Institute of Atmospheric Physics; Academy of Sciences of the Czech Republic; Prague Czech Republic
2. LESIA, Observatoire de Paris, CNRS, UPMC; 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