1. British Antarctic Survey (NERC) Cambridge UK
2. Now at Department of AstronomyUniversity of Maryland College Park MD USA
3. Now at NASA Goddard Space Flight CenterPlanetary Magnetospheres Laboratory Greenbelt MD USA
4. Royal Observatory of the Spanish Navy San Fernando Spain
5. The All‐Russia Scientific Research Institute for Geology and Mineral Resources of the Ocean Saint Petersburg Russia
6. Alfred Wegener Institute for Polar and Marine Research Bremerhaven Germany