Presentation of the instrument and the measurements
GOMOS (Global Ozone Monitoring by Occultation of Stars) is one of the three instruments dedicated to atmospheric composition sounding on board the ESA-satellite ENVISAT, launched on 1 March, 2002. Using the star occultation technique, GOMOS combines the features of high vertical resolution, good global coverage and self-calibration.
The key objective of the GOMOS mission is the long-term monitoring of the global vertical ozone distribution from the upper troposphere to the upper mesosphere on a global coverage, with a high vertical resolution, and with a very high and a long-term stable accuracy. Other objectives of the mission include the stratospheric gas-phase chemistry and mesospheric ozone and clouds.
This chapter is dedicated to a brief description of the GOMOS instrument and of the stellar occultation technique. More details on the instrument and the measurement technique may be found in the GOMOS ATBD and on the ESA web pages related to GOMOS (document references and addresses of web pages are given in Chapter 4). Characteristics of the measurements such as coverage, resolution and accuracy are presented in the second part of this chapter.