BackForwardInstrument:  ISAMS 

Instrument details
Acronym ISAMS
Full name Improved Stratospheric and Mesospheric Sounder
Purpose Atmospheric chemistry. Tracked species: CH4, CO, H2O, HNO3, N2O, N2O5, NO, O3 and aerosols
Short description Pressure-modulated correlation spectrometer, eight cells in the spectral range 4.6-16.6 µm. Spectral resolution about 5 cm-1
Background Follow-on of SAMS flown on Nimbus-7. Early failure in July 1992
Scanning Technique Limb sounding. Sampling at 200 km intervals
Resolution Vertical: 2.4 km; horizontal: 300 km along-view
Coverage / Cycle Global (except for polar regions, due to the 57° orbital inclination) in 3 days for cells of 300 km side
Mass Power Data Rate 1.25 kbit/s


Providing Agency UKSA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 1991 to 2005
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
WIGOS Subcomponents
  • Subcomponent 2
  • UV/VIS/NIR/IR/MW limb sounders
  • UV/VIS/NIR/IR/MW scanning limb sounder
Mission objectives
No mission objectives have been defined.
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.

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Note: * Primary mission objective.