1. Institute of Geophysics and Extraterrestrial Physics TU Braunschweig Braunschweig Germany
2. Laboratory for Atmospheric and Space Physics and Department of Astrophysical and Planetary Sciences University of Colorado Boulder CO USA
3. Institute for Planetology Universität Münster Münster Germany
4. Zuse Institute Berlin Berlin Germany
5. Institute for Theoretical Physics Johannes Kepler Universität Linz Linz Austria