to replace laser B which ceased operation in August 2016. Laser A then operated at only 10% power. In 2011, TES observations were shifted from global survey mode, in which it made continuous observations, to special operations mode, wherein it made high sample density observations over specific targets. Furthermore, the TES Interferometer Control System (ICS) motor began stalling in 2015. Each stall took days or weeks to recover from and as of 2018 there had been 19 of them. As a result, in early 2018 the instrument was decommissioned. See also Terra Aqua References External links NASA site Aura validation data centre Aura Mission Profile by NASA's Solar System Exploration Earth observation satellites of the United States Spacecraft launched in 2004 Spacecraft launched by Delta II rockets NASA satellites NASA satellites orbiting Earth