1. Physics Institute; University of Bern; Bern Switzerland
2. Aix-Marseille Université, CNRS, Centrale Marseille, Institut Fresnel, UMR 7249, Campus Universitaire de Saint-Jérôme; Marseille France
3. UPMC (Sorbonne University); UVSQ (UPSay); CNRS/INSU; LATMOS-IPSL; Paris France
4. LERMA; Observatoire de Paris; Paris France
5. UJF-Grenoble 1/CNRS-INSU, IPAG, UMR; Grenoble France
6. Space Research Centre; PAS; Warsow Poland