1. Physical Sciences Division; British Antarctic Survey; Cambridge UK
2. Department of Physics; University of Otago; Dunedin New Zealand
3. Department of Physics and Astronomy; Dartmouth College; Hanover New Hampshire USA
4. Space Sciences Laboratory, Department of Physics; University of California; Berkeley California USA
5. Department of Earth and Space Science; University of Washington; Seattle Washington USA
6. Sodankylä Geophysical Observatory; University of Oulu; Sodankylä Finland
7. Space Plasma Environment and Radio Science Group, Department of Communication Systems; University of Lancaster; Lancaster UK
8. Department of Physics and Astronomy; University of Calgary; Calgary, Alberta Canada