1. Space Research Institute Austrian Academy of Sciences Graz Austria
2. Swedish Institute of Space Physics Uppsala Sweden
3. NASA Goddard Space Flight Center Greenbelt MD USA
4. European Space Research and Technology Centre Noordwijk The Netherlands
5. Geodetic and Geophysical Institute Research Centre for Astronomy and Earth Sciences (RCAES) Sopron Hungary
6. Laboratory for Atmospheric and Space Physics Boulder CO USA
7. Department of Astrophysical and Planetary Sciences University of Colorado Boulder Boulder CO USA