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The GOME ozone monitoring instrument

European Space Agency


page last modified:
23 January 2004
GOME instrument on ERS-2 GOME stands for Global Ozone Monitoring Experiment. It is an instrument aboard the ERS-2 (European Remote Sensing) satellite, launched by the European Space Agency (ESA) on 21 April 1995. The picture on the right shows an artist's view of the GOME instrument on board of ERS-2. ESA uses four ground stations for downlinking ERS-2 data; they are located in Kiruna (Sweden), Gatineau (Canada), Prince Albert (Canada) and Maspalomas (Spain).

GOME is a spectrometer, which means that it measures Earthshine spectra, that is: the sunlight which is reflected back into space by molecules in the atmosphere and by the surface. The instrument also measures the solar spectrum directly. The ratio between the Earthshine and solar signal is a measure of the reflectivity of the Earth's atmosphere and surface. GOME measures the spectra in a wide wavelength range, from the ultraviolet (UV; 240 nm), via the visible into the near-infrared (790 nm), at high resolution (0.2-0.4 nm).