1. Institute for Solar‐Terrestrial Physics German Aerospace Center (DLR) Neustrelitz Germany
2. Institute of Applied Physics & Oeschger Center for Climate Change Research, Microwave Physics University of Bern Bern Switzerland
3. Department of Earth and Planetary Science Kyushu University Fukuoka Japan
4. High Altitude Observatory National Center for Atmospheric Research Boulder CO USA
5. British Antarctic Survey Cambridge UK
6. Department of Electronic & Electrical Engineering University of Bath Bath UK
7. EISCAT Scientific Association Kiruna Sweden