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    24-Jul-2014
EO Data Access
How to Apply
How to Access
Index
  Acknowledgements and contact
List of figures and tables
List of tables
 Additional information on the GOMOS measurements
Periods of data unavailabilities
Evolution of the IPF
Glossary
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
Mesosphere
Specific events
GOMOS-related theses
Other technical reports by members of GOMOS SAG, ESL and QWG
Level2 processing
How to
FAQ
Access tools
GOMOS products toolbox
EnviView
Data selection
PCD summary in the Level2 products
Obliquity
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
Accuracy
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
Services
Site Map
Frequently asked questions
Glossary
Credits
Terms of use
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Chapter 7
  List of figures and tables

7.1 List of figures

Figure 1.1: Block diagram of the GOMOS instrument.

Figure 1.2: GOMOS detector system.

Figure 1.3: Geometry of the stellar occultation measurement by GOMOS.

Figure 1.4: Example of geographical coverage of GOMOS measurements (measurements planned between 6 and 13 April 2004). The colour code for each occultation corresponds to the star ID.

Figure 1.5: Example of geographical coverage of GOMOS measurements (measurements planned between 7 and 14 April 2007). The colour code for each occultation corresponds to the star ID and its magnitude.

Figure 1.6: Area probed by occultations planned between 7 and 14 April 2007 and highlighted by occultation obliquity range.

Figure 1.7: Occultation obliquity (°) versus instrument azimuth direction (°) (measurements made between 08/03/2004 and 20/03/2004).

Figure 1.8: Vertical profiles of the median of the relative error estimates for O3 local density, from GOMOS night-time measurements during 2003; each plot corresponds to a category of star brightness (bright stars of visual magnitude lower than 0.8; typical stars of visual magnitude between 0.8 and 2.0; dim stars of visual magnitude higher than 2.0). Results on each plot are given by category of star T (hot stars of T > 10000K; typical stars of T between 6000K and 10000K; cold stars of T lower than 6000K) and by occultation obliquity (V for close to vertical occultations; O for oblique occultations; see text for details). The number of profiles used to calculate the median profile for each category is given in the curve label.

Figure 1.9: Vertical profiles of the median of the relative error estimates for NO2 local density, from GOMOS night-time measurements during 2003; each plot corresponds to a category of star brightness (bright stars of visual magnitude lower than 0.8; typical stars of visual magnitude between 0.8 and 2.0; dim stars of visual magnitude higher than 2.0). Results on each plot are given by category of star T (hot stars of T > 10000K; typical stars of T between 6000K and 10000K; cold stars of T lower than 6000K) and by occultation obliquity (V for close to vertical occultations; O for oblique occultations; see text for details). The number of profiles used to calculate the median profile for each category is given in the curve label.

Figure 1.10: Vertical profiles of the median of the relative error estimates for NO2 local density, from GOMOS night-time measurements during 2003; each plot corresponds to a category of star brightness (bright stars of visual magnitude lower than 0.8; typical stars of visual magnitude between 0.8 and 2.0; dim stars of visual magnitude higher than 2.0). Results on each plot are given by category of star T (hot stars of T > 10000K; typical stars of T between 6000K and 10000K; cold stars of T lower than 6000K) and by occultation obliquity (V for close to vertical occultations; O for oblique occultations; see text for details). The number of profiles used to calculate the median profile for each category is given in the curve label.

Figure 1.11: Vertical profiles of the median of the relative error estimates for NO3 local density, from GOMOS night-time measurements during 2003; each plot corresponds to a category of star T (hot stars of T > 10000K; typical stars of T between 6000K and 10000K; cold stars of T lower than 6000K). Results on each plot are given by category of star brightness (bright stars of visual magnitude lower than 0.8; typical stars of visual magnitude between 0.8 and 2.0; dim stars of visual magnitude higher than 2.0) and by occultation obliquity (V for close to vertical occultations; O for oblique occultations; see text for details). The number of profiles used to calculate the median profile for each category is given in the curve label.

Figure 1.12: Vertical profiles of the median of the relative error estimates for NO3 local density, from GOMOS night-time measurements during 2003; each plot corresponds to a category of star brightness (bright stars of visual magnitude lower than 0.8; typical stars of visual magnitude between 0.8 and 2.0; dim stars of visual magnitude higher than 2.0). Results on each plot are given by category of star T (hot stars of T > 10000K; typical stars of T between 6000K and 10000K; cold stars of T lower than 6000K) and by occultation obliquity (V for close to vertical occultations; O for oblique occultations; see text for details). The number of profiles used to calculate the median profile for each category is given in the curve label.

Figure 1.13: Left figure: Vertical profiles of the average and of the dispersion of O3 local density from GOMOS products (red line), and measured by ground-based lidar instruments (blue line) between 0 and 50km. Right figure: Vertical profiles of the average relative difference between O3 local density from GOMOS products and measured by ground-based lidar instruments (green lines: mean profile of the distribution with variability envelop; black line: median profile of the distribution). Coincidence criteria between GOMOS profiles and lidar profiles are a distance lower than 500 km and a time difference lower than 20 h. Only GOMOS measurements from occultations  in pure dark limb have been used.

Figure 1.14: Same as Figure 1.13, but for mid-latitude measurements.

Figure 1.15: Same as Figure 1.13, but for polar measurements.

Figure 1.16: Same as Figure 1.13, but for tropical measurements.

Figure 2.1: High level data flow of GOMOS processing.

Figure 2.2: Simplified architecture of the Level 1b processing.

Figure 2.3: Simplified architecture of the Level 2 processing.

Figure 2.4: Data flow of the calibration and the configuration files for GOMOS processing.

Figure 5.1: Ray geometries and illustration of the different altitudes.