1. Arctic Geophysics; University Centre in Svalbard; Longyearbyen Norway
2. Now at Space Vehicles Directorate; Air Force Research Laboratory; Kirtland AFB New Mexico USA
3. Department of Physics and Technology; University of Tromsø; Tromsø Norway
4. Now at Tromsø Geophysical Observatory; University of Tromsø; Tromsø Norway
5. Geophysical Institute; University of Alaska Fairbanks; Fairbanks Alaska USA
6. Institute of Geophysics and Planetary Physics; University of California; California USA
7. Birkeland Centre for Space Science; Bergen Norway