1. Department of Astronomy; University of Maryland; College Park MD USA
2. Physics Department; Catholic University of America; Washington DC USA
3. NASA Goddard Space Flight Center, Space Weather Laboratory (674); Greenbelt MD USA
4. Department of Space and Climate Physics, Mullard Space Science Laboratory; University College London; London UK
5. Department of Meteorology; University of Reading; Reading UK
6. Universities Space Research Association; Columbia MD USA
7. Space Research Institute; Austrian Academy of Sciences; Graz Austria
8. Space Sciences Department; The Aerospace Corporation; El Segundo CA USA