1. Sodankylä Geophysical Observatory University of Oulu Sodankylä Finland
2. Institute of Physics of the Earth Moscow Russia
3. Space Research Institute Moscow Russia
4. Institute for Space‐Earth Environmental Research Nagoya University Nagoya Japan
5. Ionospheric Physics Unit, University of Oulu Oulu Finland
6. National Institute of Polar Research Tokyo Japan
7. Department of Communication Engineering and Informatics University of Electro‐Communications Tokyo Japan
8. Department of Physics and Astronomy University of Leicester Leicester UK
9. Tromsø Geophysical Observatory The Arctic University of Norway Tromsø Norway