1. Department of Atmospheric, Oceanic and Space Sciences; University of Michigan; Ann Arbor Michigan USA
2. Heliophysics Science Division; NASA Goddard Space Flight Center; Greenbelt Maryland USA
3. Goddard Planetary Heliophysics Institute; University of Maryland; Baltimore County Maryland USA
4. The Johns Hopkins University Applied Physics Laboratory; Laurel Maryland USA
5. Laboratory for Atmospheric and Space Physics; University of Colorado; Boulder Colorado USA
6. Department of Terrestrial Magnetism; Carnegie Institution of Washington; Washington D.C. USA
7. Lamont-Doherty Earth Observatory; Columbia University; Palisades New York USA