[1] Department of Physics, University of Maryland, College Park,MD, United States
[2] Institute for Physical Science and Technology, University of Maryland, United States
[3] California Institute of Technology, Pasadena,CA, United States
[4] Johns Hopkins University, Applied Physics Laboratory, Laurel,MD, United States
[5] Aerospace Corporation, Los Angeles,CA, United States
[6] University of New Hampshire, Durham,NH, United States
[7] NASA, Goddard Space Flight Center, Greenbelt,MD, United States
[8] Jet Propulsion Laboratory, Pasadena,CA, United States