1. Space Research Institute; Austrian Academy of Sciences; Graz Austria
2. State Key Laboratory of Space Weather, Center for Space Science and Applied Research; Chinese Academy of Sciences; Beijing China
3. Institute of Geology and Geophysics; Chinese Academy of Sciences; Beijing China
4. Institut für Geophysik und Extraterrestrische Physik; Technische Universität Braunschweig; Braunschweig Germany
5. Max Planck Institute for Solar System Research; Katlenburg-Lindau Germany
6. Space Science Laboratory; University of California; Berkeley California USA