1. Department of PhysicsUniversity of Oslo Oslo Norway
2. Department of Physical Sciences and Center for Space and Atmospheric Research (CSAR)Embry‐Riddle Aeronautical University Daytona Beach Florida USA
3. Birkeland Centre for Space Science, Department of Physics and TechnologyUniversity of Bergen Bergen Norway
4. University Centre in Svalbard Longyearbyen Norway
5. Center for Space SciencesUniversity of Texas at Dallas Richardson Texas USA