1. DTU Space Technical University of Denmark Lyngby Denmark
2. CEA, DAM, DIF Arpajon France
3. Institute of Electronics AGH University of Science and Technology Krakow Poland
4. Department of Space Physics Institute of Atmospheric Physics Czech Academy of Sciences Prague Czech Republic
5. Faculty of Mathematics and Physics Charles University Prague Czech Republic
6. Laboratoire d’Aérologie Université de Toulouse UT3, CNRS, IRD Toulouse France
7. Earth Networks Germantown MD USA