William Swartz, Johns Hopkins University Applied Physics Laboratory, United States; Nickolay Krotkov, NASA Goddard Space Flight Center, United States; Lok Lamsal, University of Maryland, Baltimore County, United States; Frank Morgan, Benjamin Stewart, Walter Zimbeck, Johns Hopkins University Applied Physics Laboratory, United States; Gerard Otter, Floris van Kempen, The Netherlands Organization for Applied Scientific Research, Netherlands; Scott Janz, Matthew Kowalewski, NASA Goddard Space Flight Center, United States; Pieternel Levelt, National Center for Atmospheric Research, United States; Pepijn Veefkind, Royal Netherlands Meteorological Institute, United States