1. Space Research Group, Department of Geophysics and Space Sciences; Eötvös University; Budapest Hungary
2. Research Group for Geology, Geophysics and Space Sciences; Hungarian Academy of Sciences; Budapest Hungary
3. Department of Physics; University of Otago; Dunedin New Zealand
4. British Antarctic Survey; Cambridge UK
5. Hermanus Magnetic Observatory; Hermanus South Africa
6. School of Physics; University of KwaZulu-Natal; Durban South Africa