Universities Space Research Association and Laboratory for Solar and Space Physics, NASA Goddard Space Flight Center, Code 612.3, Greenbelt, MD 20771, USA
Institute for Research in Electronics and Applied Physics, University of Maryland, Energy Research Facility (Bldg. #223), Paint Branch Drive, University of Maryland, College Park, MD 20742-3511, USA
Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723-6099, USA