1. Leibniz‐Institute of Atmospheric Physics at the Rostock University Kühlungsborn Germany
2. GFZ German Research Centre for Geosciences Potsdam Germany
3. Tromsø Geophysical Observatory UiT‐The Arctic University of Norway Tromsø Norway
4. National Institute of Polar Research Tokyo Japan
5. Beijing National Observatory of Space Environment, Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China