1. Center for Space Physics Boston University Boston MA USA
2. Department of Physics and Astronomy University of Kansas Lawrence KS USA
3. Blackett Laboratory Imperial College London London UK
4. The Johns Hopkins University Applied Physics Laboratory Laurel MD USA
5. Southwest Research Institute San Antonio TX USA
6. Department of Climate and Space Sciences and Engineering University of Michigan Ann Arbor MI USA
7. Department of Physics and Astronomy University of Iowa Iowa City IA USA
8. Swedish Institute of Space Physics Uppsala Sweden