1. Centrum voor Plasma-Astrofysica, Departement Wiskunde; Katholieke Universiteit Leuven; Leuven Belgium
2. Faculty of Geodesy; Hvar Observatory; Zagreb Croatia
3. Noveltis; Ramonville-Saint-Agne France
4. Institute of Physics; University of Graz; Graz Austria
5. Solar-Terrestrial Center of Excellence-SIDC; Royal Observatory of Belgium; Brussels Belgium