1. Finnish Meteorological Institute; Helsinki Finland
2. Department of Electronics and Nanoengineering, School of Electrical Engineering; Aalto University; Espoo Finland
3. Laboratory for Atmospheric and Space Physics; University of Colorado Boulder; Boulder CO USA
4. LATMOS/IPSL, UVSQ Université Paris-Saclay, UPMC University Paris CNRS; Guyancourt France
5. Université de Toulouse, UPS-OMP, IRAP; Toulouse France
6. Swedish Institute of Space Physics; Kiruna Sweden