1. Department of Physics University of Helsinki Helsinki Finland
2. Finnish Meteorological Institute, Space and Earth Observation Centre Helsinki Finland
3. School of Electrical Engineering Aalto University Espoo Finland
4. Department of Physics and Astronomy University of Turku Turku Finland
5. Space Climate Research Unit University of Oulu Oulu Finland
6. Department of Climate and Space Sciences and Engineering University of Michigan Ann Arbor MI USA
7. Department of Future Technologies University of Turku Turku Finland
8. Sodankylä Geophysical Observatory (Oulu Unit) University of Oulu Oulu Finland
9. Tartu Observatory University of Tartu Tõravere Estonia