1. Blackett LaboratoryImperial College London London UK
2. School of Physics and AstronomyQueen Mary University of London London UK
3. Electrical and Computer Engineering DepartmentVirginia Polytechnic Institute and State University Blacksburg Virginia USA
4. Department of Mechanical Engineering and Center for Space PhysicsBoston University Boston Massachusetts USA
5. Space Sciences LaboratoryUniversity of California Berkeley California USA
6. Space Research InstituteAustrian Academy of Sciences Graz Austria
7. Department of Earth, Planetary and Space SciencesUniversity of California Los Angeles California USA