BackForwardInstrument:  SMR 

Instrument details
Acronym SMR
Full name Sub-Millimetre Radiometer
Purpose Chemistry of the high atmosphere.  Tracked species: ClO, H2O, H2O2, HNO3, HO2, N2O, O3, temperature and pressure
Short description 5-bands millimetre-submillimetre heterodyne radiometer. One band around 118 GHz, four bands in the range 480-580 GHz. Spectral resolution 0.1 to 1.0 MHz
Background New development
Scanning Technique Limb scanning
Resolution Vertical: 1.5-3 km, in the altitude range 5-100 km.  Horizontal effective resolution: ~ 300 km (limb geometry)
Coverage / Cycle Global coverage every 3 d for cells of 300 km side
Mass Power Data Rate


Providing Agency SNSB
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2001 to ≥2018
Last update: 2017-03-29
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
  • ClO
  • H2O
  • HCl
  • N2O
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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
Atmospheric temperature4 - fairLimited to high atmosphere.Mm-submm spectrometry in 60-650 GHz range
BrO3 - highLimited to high atmosphere.Mm-submm spectrometry. BrO lines around 640 GHz.
ClO3 - highLimited to high atmosphere.Mm-submm spectrometry. ClO lines around 640 GHz.
H2O4 - fairLimited to high atmosphere.Mm-submm spectrometry. H2O lines in bands 183, 325, 380, 448, 556 GHz, and others.
HCl2 - very highLimited to high atmosphere.Mm-submm spectrometry. HCl lines in a band around 625 GHz
N2O3 - highLimited to high atmosphere.Mm-submm spectrometry. N2O lines in bands around 300 and 500 GHz.
O33 - highLimited to high atmosphere.Mm-summ spectrometryOzone lines around 240, 300 and 500 GHz.
Specific humidity4 - fairLimited to high atmosphere.Mm-submm spectrometry of water vapour bands at frequency up to 650 GHz (main: around 183, 325, 380, 448 and 556 GHz)