1. Finnish Meteorological Institute; Helsinki Finland
2. Solar-Terrestrial Environment Laboratory; Nagoya University; Nagoya Japan
3. Deceased 16 December 2014
4. Now at Astronomy and Space Physics Unit; University of Oulu; Oulu Finland
5. Astrophysics Division; Technical University of Denmark, DTU Space; Lyngby Denmark
6. Now at Astronomy and Space Physics Unit Helmholtz-Centre Potsdam, GFZ German Research Center for Geosciences; Potsdam Germany
7. European Space Agency/ESTEC; Noordwijk Netherlands
8. European Space Agency/ESAC; Madrid Spain
9. European Space Agency/ESRIN; Frascati Italy