1. Conrad Observatory Zentralanstalt für Meteorologie und Geodynamik Vienna Austria
2. Space Research Institute Austrian Academy of Sciences Graz Austria
3. Institute of Geodesy Graz University of Technology Graz Austria
4. Heliophysics Science Division NASA Goddard Space Flight Center Greenbelt MD USA
5. Air Force Research Laboratory Space Vehicles Directorate Kirtland OH USA
6. Space and Atmospheric Electricity Group Department of Meteorology University of Reading Reading UK
7. Institute of Physics University of Graz Graz Austria