1. Centre for Mathematical Plasma Astrophysics 1 , KU Leuven, Celestijnenlaan 200B, 3001 Leuven, Belgium
2. Dutch Institute for Fundamental Energy Research 2 , 5612 AJ Eindhoven, The Netherlands
3. Eindhoven University of Technology 3 , 5600 MB Eindhoven, The Netherlands
4. Department of Physics & Astronomy, Ruhr-Universität Bochum 4 , D-44780 Bochum, Germany
5. Institute of Physics, University of Maria Curie-Skłodowska 5 , ul. Radziszewskiego 10, 20-031 Lublin, Poland