1. Department of Physics and Technology Birkeland Centre for Space Science University of Bergen Bergen Norway
2. Karlsruhe Institute of Technology Eggenstein‐Leopoldshafen Germany
3. University of Oulu Oulu Finland
4. Birkeland Centre for Space Science Norwegian University of Science and Technology Trondheim Norway
5. British Antarctic Survey (UKRI‐NERC) Cambridge England
6. Instituto de Astrofísica de Andalucía CSIC Granada Spain
7. Space and Earth Observation Centre Finnish Meteorological Institute Helsinki Finland
8. LASP University of Colorado Boulder CO USA
9. University of Otago Dunedin New Zealand
10. PMOD/WRC Davos Switzerland
11. St. Petersburg State University St. Petersburg Russia
12. University of Rostock Rostock Germany
13. Skobeltsyn Institute of Nuclear Physics Lomonosov Moscow State University Moscow Russia