1. Karlsruhe Institute of Technology Leopoldshafen Germany
2. Department Physics and Technology Birkeland Centre for Space Science University of Bergen Bergen Norway
3. University of Oulu Oulu Finland
4. Norwegian University of Science and Technology Trondheim Norway
5. Instituto de Astrofísica de Andalucía CSIC Granada Spain
6. Formerly at the Department of Meteorology Stockholm University Stockholm Sweden
7. LASP University of Colorado Boulder CO USA
8. PMOD/WRC Davos and IAC ETH Zurich Switzerland
9. Saint Petersburg State University Saint Petersburg Russia
10. Max‐Planck Institute for Meteorologie Hamburg Germany
11. Institute of Meteorology and Climatology University of Natural Resources and Life Sciences Vienna Austria
12. Space and Earth Observation Centre Finnish Meteorological Institute Helsinki Finland
13. University of Rostock Rostock Germany
14. Skobeltsyn Institute of Nuclear Physics Lomonosov Moscow State University Moscow Russia