1. Blackett LaboratoryImperial College London London UK
2. Space Research Laboratory, Department of Physics and AstronomyUniversity of Turku Turku Finland
3. Department of Earth, Planetary, and Space SciencesUniversity of California Los Angeles CA USA
4. Swedish Institute of Space Physics Uppsala Sweden
5. Department of Electronics and Nanoengineering, School of Electrical EngineeringAalto University Espoo Finland
6. Department of Space ScienceUniversity of Alabama in Huntsville Huntsville AL USA
7. NASA Goddard Space Flight Center Greenbelt MD USA