1. Department of Astrophysical Sciences; Princeton University; Princeton NJ USA
2. Princeton Center for Heliophysics, Princeton Plasma Physics Laboratory; Princeton University; Princeton NJ USA
3. Department of Climate and Space Sciences and Engineering; University of Michigan; Ann Arbor MI USA
4. Department of Earth and Space Sciences; Los Angeles CA USA
5. NASA Goddard Space Flight Center; Greenbelt MD USA
6. Laboratory for Atmospheric and Space Physics; University of Colorado Boulder; Boulder CO USA
7. Space Sciences Laboratory; University of California; Berkeley CA USA
8. Department of Physics and Astronomy; University of Iowa; Iowa City IA USA
9. Department of Physics and Astronomy; Eastern Michigan University; Ypsilanti MI USA