BackForwardInstrument:  SAGE-II 

Instrument details
Acronym SAGE-II
Full name Stratospheric Aerosol and Gas Experiment - II
Purpose Observation of stratospheric H2O, NO2, O3 and aerosol
Short description UV/VIS/NIR grating spectrometer with 7 sub-bands in the spectral range 0.385-1.020 µm. Spectral resolution from 1 to 2 nm
Background Follow-on of SAGE-1 flown in 1979-1981 on AEM-2 (Application Explorer - 2)
Scanning Technique Sun occultation
Resolution 300 km (horizontal), 1-2 km (vertical)
Coverage / Cycle N/A (few tens of events/day limited to latitudes ~ 57°)
Mass 29.5 kg Power 18 W Data Rate 6.3 kbps

 

Providing Agency NASA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 1985 to 2005-10-14
Last update: 2017-01-17
Detailed characteristics
Satellites this instrument is flying on

Note: a red tag indicates satellites no longer operational, a green tag indicates operational satellites, a blue tag indicates future satellites

Instrument classification
  • Earth observation instrument
  • Limb sounders
  • Limb sounder
Mission objectives
Primary mission objectives
  • BrO Mole Fraction
  • ClO Mole Fraction
  • H2O Mole Fraction
  • HCHO Mole Fraction
  • NO Mole Fraction
Show allShow fewer
Tentative Evaluation of Measurements

The following list indicates which measurements can typically be retrieved from this category of instrument. To see a full Gap Analysis by Variable, click on the respective variable.

Note: table can be sorted by clicking on the column headers
VariableRelevance for measuring this variableOperational limitationsExplanation
Aerosol mass mixing ratio5 - marginalLimited to high atmosphere.. Limited to high latitudes.. Daylight only.UV, VIS, NIR limb sounding by solar occultation. Self-calibrating
Atmospheric temperature5 - marginalLimited to high atmosphere.. Limited to high latitudes.. Daylight only.UV, VIS, NIR limb sounding by solar occultation. Self-calibrating
BrO Mole Fraction5 - marginalLimited to high atmosphere.. Limited to high latitudes.. Daylight only.UV spectrometry. BrO lines around 300 nm. Limb sounding by solar occultation.. Self-calibrating
HCHO Mole Fraction5 - marginalLimited to high atmosphere.. Limited to high latitudes.. Daylight only.UV spectrometry. HCHO lines around 350 nm Limb sounding by solar occultation. Self-calibrating
ClO Mole Fraction5 - marginalLimited to high atmosphere.. Limited to high latitudes.. Daylight only.UV spectrometry. ClO lines around 300 nm. Limb sounding by solar occultation. Self-calibrating
H2O Mole Fraction5 - marginalDaylight only.. Limited to high atmosphere.. Limited to high latitudes.Spectrometry in UV and VIS (several weak bands) and NIR (strong band around 940 nm). Limb sounding by solar occultation. Self-calibrating
NO Mole Fraction5 - marginalLimited to high atmosphere.. Limited to high latitudes.. Daylight only.UV spectrometry. NO lines around 250 nm. Limb sounding by solar occultation. Self-calibrating
NO2 Mole Fraction5 - marginalLimited to high atmosphere.. Limited to high latitudes.. Daylight only.UV and VIS spectrometry. Several lines in the ranges around 220 nm and 400 nm. Limb sounding by solar occultation. Self-calibrating
O3 Mole Fraction5 - marginalLimited to high atmosphere.. Limited to high latitudes.. Daylight only.UV and VIS spectrometry. Ozone lines in the bands around 260 nm (Hartley) and/or 340 nm (Huggins) and 600 nm (Chappuis). Limb sounding by solar occultation. Self-calibrating
PSC occurrence5 - marginalLimited to high atmosphere.. Limited to high latitudes.. Daylight only.UV and VIS spectrometry. Limb sounding by solar occultation. Self-calibrating
SO2 Mole Fraction5 - marginalLimited to high atmosphere.. Limited to high latitudes.. Daylight only.UV spectrometry. SO2 lines around 350 nm. Limb sounding by solar occultation. Self-calibrating
Specific humidity5 - marginalLimited to high atmosphere.. Limited to high latitudes.. Daylight only.UV, VIS and NIR spectrometry with several water vapour bands (main: around 940 nm). Limb sounding by solar occultation, Self-calibrating
Aerosol volcanic ash5 - marginalLimited to high atmosphere.. Limited to high latitudes.. Daylight only.UV, VIS and NIR spectrometry; limb sounding by solar occultation. Self-calibrating