An ozone-monitoring experiment conducted aboard both of the European Remote-Sensing Satellites, launched in 1991 and 1995. GOME was the first European ozone-monitoring instrument, measuring the level of ozone in the Earth's atmosphere, investigating ozone and other gases involved in ozone photochemistry, and providing data on the causes of ozone depletion. It was succeeded by the scanning image absorption spectrometer for atmospheric cartography on the Envisat.