1. Department of Arctic Geophysics; University Centre in Svalbard; Longyearbyen Norway
2. Birkeland Centre for Space Science; Bergen Norway
3. Department of Physics and Astronomy; University of Southampton; Southampton UK
4. Space and Upper Atmospheric Sciences Group; National Institute of Polar Research; Tokyo Japan
5. Arctic Research; Finnish Meteorological Institute; Helsinki Finland
6. Department of Physics and Technology; University of Bergen; Bergen Norway
7. INAF-IAPS; Institute for Space Astrophysics and Planetology; Rome Italy
8. Danish Meteorological Institute; Copenhagen Denmark
9. Sodankylä Geophysical Observatory; University of Oulu; Oulu Finland