1. Center for Space Physics; Boston University; Boston Massachusetts USA
2. Heliophysics Science Division; NASA Goddard Space Flight Center; Greenbelt Maryland USA
3. School of Physics and Astronomy; Queen Mary University of London; London UK
4. Goddard Earth Sciences and Technology Center; University of Maryland; College Park Maryland USA
5. Department of Atmospheric, Oceanic and Space Sciences; University of Michigan; Ann Arbor Michigan USA
6. Catholic University of America; Washington D.C. USA
7. The Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
8. Lamont-Doherty Earth Observatory; Columbia University; Palisades New York USA
9. Department of Terrestrial Magnetism; Carnegie Institution of Washington; Washington D.C. USA