1. Department of Physics and Technology; University of Tromsø-The Arctic University of Norway; Tromsø Norway
2. Department of Arctic Geophysics; University Centre in Svalbard; Longyearbyen Norway
3. Department of Physics; University of Oslo; Oslo Norway
4. Birkeland Centre for Space Science; University of Bergen; Bergen Norway
5. Institute of Space and Atmospheric Studies; University of Saskatchewan; Saskatoon Saskatchewan Canada
6. Department of Physics and Astronomy; University of Calgary; Calgary Alberta Canada
7. Max-Planck Institute for Solar Systems Research; Göttingen Germany