1. Deutsches Zentrum für Luft‐ und Raumfahrt Institut fr̈ Solar‐Terrestrische Physik Neustrelitz Germany
2. Institute of Applied Physics & Oeschger Center for Climate Change Research Microwave Physics University of Bern Bern Switzerland
3. Sodankylä Geophysical Observatory of the University of Oulu Sodankylä Finland
4. University of Leicester Leicester UK
5. Swedish Institute of Space Physics Kiruna Sweden