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List of figures and tables
List of tables
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List of abbreviations and acronyms
Product types and structure
Other sources of information
GOMOS-related ESA web pages
Publications (peer-reviewed publications and proceedings of conferences)
Secondary products
Scintillation and turbulence
Aerosols and PSC
Product validation
NO2 and NO3 measurements
O3 measurements
CAL/VAL activities
Retrieval and processing issues
Assimilation of GOMOS products
Specific events
GOMOS-related theses
Other technical reports by members of GOMOS SAG, ESL and QWG
Level2 processing
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Access tools
GOMOS products toolbox
Data selection
PCD summary in the Level2 products
Star properties
Data availability
Presentation of the GOMOS products
Description of the products
Product content
Product structure
Time availability
Data size
Presentation of the instrument and the measurements
Scientific achievements
Validation results
Measurement characteristics
Occultation obliquity
Geographical and time coverage
Star characteristics
Mission planning
Modified mission scenario since August 2005
Instrument description and measurement principle
Calibration phase and monitoring activities
Measurement technique
GOMOS Product Handbook
Content of the products
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Frequently asked questions
Terms of use
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Chapter 1
Presentation of the instrument and the measurements

1.1 Introduction

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.

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