1. Department of Electronics and Nanoengineering School of Electrical Engineering Aalto University Espoo Finland
2. Finnish Meteorological Institute Helsinki Finland
3. National Institute of Astrophysics Institute for Space Astrophysics and Planetology INAF‐IAPS Rome Italy
4. Space Research Institute Austrian Academy of Sciences Graz Austria
5. Department of Climate and Space Sciences and Engineering University of Michigan Ann Arbor MI USA