1. Space Environment Physics Group, Department of Meteorology; University of Reading; Reading UK
2. Space and Atmospheric Physics; Imperial College London; London UK
3. NASA Goddard Space Flight Center; Greenbelt Maryland USA
4. Astronomy Department; University of Maryland; College Park Maryland USA
5. Department of Physics and Astronomy; Dartmouth College; Hanover New Hampshire USA
6. School of Physics, Astronomy, Computational Sciences; George Mason University; Fairfax Virginia USA
7. State Key Laboratory for SpaceWeather, Center for Space Science and Applied Research; Chinese Academy of Sciences; Beijing China