1. British Antarctic Survey (NERC); Cambridge UK
2. Department of Physics; University of Otago; Dunedin New Zealand
3. Sodankylä Geophysical Observatory; University of Oulu; Sodankylä Finland
4. Department of Physics; Augsburg College; Minneapolis Minnesota USA
5. University of New Hampshire; Durham New Hampshire USA
6. Geomagnetic Laboratory; Natural Resources Canada; Ottawa Ontario Canada
7. Department of Physics; University of Alberta; Edmonton Alberta Canada