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    24-Jul-2014
EO Data Access
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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
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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
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GOMOS products toolbox
EnviView
Data selection
PCD summary in the Level2 products
Obliquity
Star properties
Data availability
Presentation of the GOMOS products
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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
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3.2 Data availability

There are two main periods of time during which instrument failures prevented operational measurements. Between May 2003 and July 2003, due to a steering system problem and the consequent progressive reduction of the instrument Field of View, the measurement efficiency was lower. The measurement frequency resumed after the switch to the redundant electronics chain. A second steering system problem (failure of the Elevation voice-coil) occurred in early January 2005 and prevented operational measurements until July 2005, when a new mission scenario with a reduced azimuth range was implemented. This new scenario affects the effective global coverage of the measurements (see section 1.4 of this document).