1. Department of Chemistry, Physics and Environment, ECEE; Dunărea de Jos University of Galaţi; Galaţi Romania
2. Faculty of Sciences; University of Oulu; Oulu Finland
3. Finnish Meteorological Institute; Helsinki Finland
4. Royal Belgian Institute for Space Aeronomy, Space Physics and STCE; Brussels Belgium
5. Center for Space Radiations and Georges Lemaître Centre for Earth and Climate Research, Earth and Life Institute; Université Catholique de Louvain; Louvain-la-Neuve Belgium