Thomas Ulich, Carl-Fredrik Enell, Antti Kero and Tero Raita
Sodankylä Geophysical Observatory, University of Oulu
Finland
Johanna Tamminen, Pekka Verronen, Sanna-Mari Salmi and Erkki Kyrölä
Finnish Meteorological Institute*
Finland
Mark Clilverd and Annika Seppälä*
British Antarctic Survey
UK
University of Otago
New Zealand
Esa Turunen
EISCAT Scientific Association
Sweden
