1. Birkeland Centre for Space Science; University of Bergen; Norway
2. Max-Planck Institute for Solar Systems Research; Göttingen Germany
3. Swedish Institute of Space Physics; Uppsala Sweden
4. Swedish Institute of Space Physics; Kiruna Sweden
5. Birkeland Centre for Space Science; The University Centre in Svalbard; Longyearbyen Norway
6. Department of Geophysics; University of Oslo; Norway
7. Royal Belgian Institute for Space Aeronomy; Brussels Belgium
8. Department of Physics; University of Oslo Norway