1. Munich Germany
2. Department of Geophysics University of Zagreb Zagreb Croatia
3. Climate and Space Sciences and Engineering University of Michigan Ann Arbor Michigan USA
4. Royal Belgian Institute for Space Aeronomy (Space Physics and STCE) Brussels Belgium
5. Earth and Life Institute, TECLIM Université Catholique de Louvain Belgium
6. Research Centre for Microtechnology University of Applied Sciences Dornbirn Austria