1. Department of Earth and Environmental Sciences Ludwig‐Maximilians‐University Munich Germany
2. Space Research Institute Russian Academy of Sciences Moscow Russia
3. Johns Hopkins University Applied Physics Laboratory Laurel MD USA
4. Astronomy and Space Physics Department Kyev Taras Shevchenko University Kyev Ukraine
5. Center for Space Physics Boston University Boston MA USA
6. Max Planck Institute for Solar System Research Göttingen Germany