Global Ozone Monitoring by Occultation of Stars
|Within Vocab||SeaVoX Device Catalogue|
|Definition||A grating spectrometer designed to perform stellar occultation measurements in the ultraviolet, visible and near-infrared spectral range to monitor the levels of ozone and other gas species in the atmosphere. The instrument operates using the technique of stellar occultation, which involves tracking a pre-selected star and making measurements of its emitted radiation through the Earth's atmosphere until it disappears behind the horizon. The spectrometer uses a grating to disperse the detected radiation into its spectrum, which holds information on the atmospheric concentration of different gases. The instrument also carries two fast photometers to detect the scintillation of the input signal, which carries information on turbulence. The spectrometer operates in approximately 1000 channels spread across three spectral bands ranging between (0.25 - 0.67) um, (0.75 - 0.77) um and (0.93 - 0.95) um, at a spectral resolution of (0.0002 - 0.0012) um. The photometers operate within the (0.47 - 0.52) um and (0.62 - 0.70) um spectral bands respectively, at a spectral resolution of 0.05 um. The instrument measures approximately 500 star occultations per day, or 25-40 occultations per orbit. The instrument's vertical resolution is 1.7 km, whilst the horizontal effective resolution is approximately 300 km. GOMOS measures within the altitude range of (20 - 100) km. Flown on Envisat. http://www.wmo-sat.info/oscar/instruments/view/168|
|Has Current Version||1|
|Broader||Atmospheric chemistry remote sensors|
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