Robert Michell, University of Maryland College Park, College Park, MD, United States, Douglas E. Rowland, NASA Goddard Space Flight Center, Greenbelt, MD, United States, James Clemmons, University of New Hampshire, Durham, NH, United States, Guy Alan Grubbs II, Catholic University of America, Washington, DC, United States and Michael R Collier, NASA/GSFC, Greenbelt, MD, United States