BackForwardInstrument:  SM (Meteor-2) 

Instrument details
Acronym SM (Meteor-2)
Full name Infrared Sounding Radiometer
Purpose Atmospheric temperature and humidity profile
Short description 9-channel IR radiometer operating in the range 9.65-18.70 ┬Ám
Background New development
Scanning Technique Cross-track, swath 1000 km
Resolution 42 km at s.s.p.
Coverage / Cycle Global in 1.5 days
Mass Power Data Rate


Providing Agency Roscosmos
Instrument Maturity Flown on operational programme
Utilization Period: 1975 to 1977
Last update: 2016-10-29
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
  • Passive optical radiometer or spectrometer
  • Cross-nadir infrared sounder, possibly including VIS channels
WIGOS Subcomponents No WIGOS subcomponents have been defined.
Mission objectives
Primary mission objectives
  • Atmospheric temperature
  • Integrated Water Vapour (IWV)
Secondary mission objectives
  • Sea surface temperature
Opportunity objectives
  • Cloud cover
  • Cloud top height
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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 temperature3 - highCloud sensitive.. Coarse vertical resolution.. Inaccurate in low troposphere.Many TIR channels in the 15 micrometer band
Cloud cover5 - marginalDiscontinuous coverage.TIR channel(s)
Cloud top height3 - highDiscontinuous coverage.TIR channels in window and in CO2 band for atmospheric column above cloud top
Cloud top temperature4 - fairDiscontinuous coverage.TIR window channels
Land surface temperature4 - fairCloud sensitive.. Coarse spatial resolution.TIR split window channels for water vapour correction
Sea surface temperature4 - fairCloud sensitive.TIR split window channels for water vapour correction
Integrated Water Vapour (IWV)3 - highCloud sensitive.TIR and FIR channels from the 11 micrometers window into the 18 micrometers water vapour rotational band
Upward long-wave irradiance at TOA5 - marginalSpectral interpolation needed.TIR and FIR channels in the 11 micrometers window, and in water vapour and CO2 bands around 6.3, 15 and 18 micrometers