1. Birkeland Centre for Space Science, Department of Physics and Technology University of Bergen Bergen Norway
2. University Centre in Svalbard Longyearbyen Norway
3. Birkeland Centre for Space Science University Centre in Svalbard Longyearbyen Norway
4. Now at British Antarctic Survey Cambridge UK
5. European Incoherent Scatter Association Ramfjordbotn Norway
6. Department of Physics University of Oslo Oslo Norway