1. The Johns Hopkins University Applied Physics Laboratory; Laurel MD USA
2. Center for Solar-Terrestrial Research; New Jersey Institute of Technology; Newark NJ USA
3. Department of Physics and Astronomy; University of Iowa; Iowa City IA USA
4. Institute for the Study of Earth, Oceans, and Space; University of New Hampshire; Durham NH USA
5. School of Physics and Astronomy; University of Minnesota, Twin Cities; Minneapolis MN USA