1. Department of Physics; University of Helsinki; Helsinki Finland
2. Space Research Institute; Austrian Academy of Sciences; Graz Austria
3. Institute for Astrophysics; Georg-August-University of Göttingen; Göttingen Germany
4. Mullard Space Science Laboratory; University College London; Dorking UK
5. Center for Mathematical Plasma Astrophysics, Department of Mathematics; KU Leuven; Leuven Belgium
6. STFC-RAL Space; Rutherford Appleton Laboratory; Harwell Campus UK