1. The Johns Hopkins University Applied Physics Laboratory Laurel Maryland USA
2. Department of Electrical and Computer EngineeringVirginia Polytechnic Institute and State University Blacksburg Virginia USA
3. Institute of Geophysics and Planetary Physics and Department of Earth and Space SciencesUniversity of California Los Angeles California USA
4. Institute for Geophysics and Extraterrestrial PhysicsTechnical University of Braunschweig Brunswick Germany
5. Max‐Planck Institute for Solar System Research Göttingen Germany