1. School of Physics and AstronomyUniversity of Minnesota Minneapolis Minnesota USA
2. State Key Laboratory of Space Weather, Center for Space Science and Applied Research, Chinese Academy of Sciences Beijing China
3. Space Sciences LaboratoryUniversity of California Berkeley California USA
4. The Aerospace Corporation El Segundo California USA
5. Johns Hopkins University Applied Physics Laboratory Laurel Maryland USA
6. Department of Physics and AstronomyUniversity of Iowa Iowa City Iowa USA