1. Department of Earth and Environmental Sciences Ludwig Maximilian University of Munich Munich Germany
2. Max Planck Institute for Solar System Research Göttingen Germany
3. Space Research Institute Russian Academy of Sciences Moscow Russia
4. Moscow Institute of Physics and Technology Moscow Russia
5. Helmholtz‐Centre Potsdam ‐ GFZ German Research Centre for Geosciences Potsdam Germany
6. Institute of Physics and Astronomy University of Potsdam Potsdam Germany
7. Geophysical Center of the Russian Academy of Sciences Moscow Russia
8. Max Planck Institute for Extraterrestrial Physics Garching Germany