1. Finnish Meteorological Institute Helsinki Finland
2. Department of Climate and Space Sciences and Engineering University of Michigan Ann Arbor MI USA
3. Department of Physics Ben Gurion University of the Negev Beer‐Sheva Israel
4. Swedish Institute of Space Physics Uppsala Sweden
5. Space and Plasma Physics Department of Physics and Astronomy Uppsala University Uppsala Sweden
6. University of Amsterdam Amsterdam The Netherlands
7. Department of Earth, Planetary, and Space Sciences University of California Los Angeles CA USA