WMO OSCAR | Details for Instrument SI-1

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Instrument: SI-1

Instrument details

Acronym	SI-1
Full name	Spectrometer/Interferometer - German Democratic Republic
Purpose	Temperature/humidity profiling and total-column ozone
Short description	Nadir viewing infrared interferometer developed by the GDR. Spectral region covered 6.25-25 microns wavelength with a resolution of 5cm-1 after apodisation. An on board black body and deep space view were used for calibration. More details: https://tinyurl.com/2tahhvz3
Background	New development - Provided by the German Democratic Republic
Scanning Technique	Nadir-only pointing
Resolution	25 km
Coverage / Cycle	Global in 10 days for cells of 100 km side
Mass		Power	Data Rate

Providing Agency	Roscosmos
Instrument Maturity	Flown on an R&D satellite
Utilization Period:	1976 to 1981
Last update:	2023-03-06

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

Meteor-Priroda (Roscosmos)
- Meteor-P2 (see instrument status) Aug 1976 - May 1978
- Meteor-P3 (see instrument status) Oct 1977 - Jul 1979
- Meteor-P4 (see instrument status) Apr 1979 - Jan 1981

Instrument classification

Earth observation instrument
Passive optical radiometer or spectrometer
Cross-nadir infrared sounder, possibly including VIS channels

WIGOS Subcomponents

Subcomponent 1
IR hyperspectral sounders [in SSO]
IR hyperspectral sounder [in SSO]

Mission objectives

Primary mission objectives

Atmospheric temperature
Integrated Water Vapour (IWV)
Specific humidity

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
Note: * Primary mission objective.

Search:

Variable	Relevance for measuring this variable	Operational limitations	Explanation
Atmospheric temperature*	3 - high	Cloud sensitive.. Coarse vertical resolution.. Inaccurate in low troposphere.. Along-track only.	Many TIR channels in the 15 micrometer band
Cloud top height	3 - high	Discontinuous coverage.. Along-track only.	TIR channels in window and in CO2 band for atmospheric column above cloud top
Cloud top temperature	3 - high	Discontinuous coverage.. Along-track only.	TIR channels in window and water vapour band (for emissivity)
Specific humidity*	3 - high	Cloud sensitive.. Very coarse vertical resolution.. Middle troposphere only.. Along-track only.	TIR channels in the water vapour band around 6.3 micrometers
Integrated Water Vapour (IWV)*	3 - high	Cloud sensitive.. Along-track only.	TIR and FIR channels from the 11 micrometers window into the 18 micrometers water vapour rotational band
Land surface temperature	4 - fair	Cloud sensitive.. Coarse spatial resolution.. Along-track only.	TIR split window channels for water vapour correction
Sea surface temperature	4 - fair	Cloud sensitive.. Along-track only.	TIR split window channels for water vapour correction
Cloud cover	5 - marginal	Discontinuous coverage.. Along-track only.	TIR channel(s)
O3 Total Column	5 - marginal	Cloud sensitive.. Along-track only.	TIR channel(s). Ozone lines in band around 9.7 micrometers
Upward long-wave irradiance at TOA	5 - marginal	Spectral interpolation needed.. Along-track only.	TIR and FIR channels in the 11 micrometers window, and in water vapour and CO2 bands around 6.3, 15 and 18 micrometers

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