1. Department of Astrophysics University of Vienna Vienna Austria
2. Space Research Institute Austrian Academy of Sciences Graz Austria
3. Swedish Institute of Space Physics Kiruna Sweden
4. Skobeltsyn Institute of Nuclear Physics Lomonosov Moscow State University Moscow Russia
5. Institute of Astronomy Russian Academy of Sciences Moscow Russia
6. Institute of Laser Physics Siberian Branch of the Russian Academy of Sciences Novosibirsk Russia