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Instrument details
Acronym
MX-LWIR
Full name
Multispectral - Long Wave Infrared
Purpose
Frequent high-resolution observation of surface temperatures
Short description
6-channel radiometer in the TIR range [see detailed characteristics below]
Background
Complementary to MX-VNIR
Scanning Technique
Mechanical, addressable everywhere in the disc with variable area coverage
Resolution
1.5 km at s.s.p.
Coverage / Cycle
Depending on the size of the scanned area. 30 min for the India region
Mass
Power
Data Rate
Providing Agency
ISRO
Instrument Maturity
Flown on an R&D satellite
Utilization Period:
≥2021 to ≥2028
Last update:
2021-06-16
Detailed characteristics
Central wavelength
Spectral interval
NEΔT @ specified input
7.35 µm
7.1-7.6 µm
0.15 K @ 300 K
8.50 µm
8.3-8.7 µm
0.15 K @ 300 K
9.60 µm
9.4-9.8 µm
0.15 K @ 300 K
10.8 µm
10-3-11.3 µm
0.15 K @ 300 K
12.0 µm
11.5-12.5 µm
0.15 K @ 300 K
13.25 µm
13.0-13.5 µm
0.15 K @ 300 K
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 High resolution optical imager
WIGOS Subcomponents
Subcomponent 1 High-resolution multi-spectral VIS/IR imagers
Mission objectives
Primary mission objectives Fire fractional cover Fire radiative power Fire temperature Land surface temperature Sea surface temperature
Secondary mission objectives Accumulated precipitation (over 24 h) Integrated Water Vapour (IWV) Precipitation intensity at surface (liquid or solid) Opportunity objectives Cloud cover Cloud top height Cloud top temperature Show all Show 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
Variable Relevance for measuring this variable Operational limitations Explanation
Accumulated precipitation (over 24 h) 3 - high Convective precipitation dominant.. Calibration by MW needed. TIR channel(s) in the 10-13 micrometers range. Frequent sampling (GEO) is essential for accumulated precipitation
Cloud cover 5 - marginal Infrequent coverage. TIR window channel(s) around 11 micrometers
Cloud top height 3 - high Infrequent coverage. TIR channels in the 11 micrometers window and the water vapour band around 6.3 micrometers (for emissivity) to estimate cloud top height from its temperature
Cloud top temperature 2 - very high Infrequent coverage. TIR channels in the window around 11 micrometers and the water vapour band around 6.3 micrometers (for emissivity) to estimate cloud top height from its temperature
Fire fractional cover 2 - very high Cloud sensitive.. Infrequent coverage. TIR window channel(s) around 11 micrometers
Fire radiative power 5 - marginal Cloud sensitive.. Infrequent coverage. TIR window channel(s) around 11 micrometers
Fire temperature 5 - marginal Cloud sensitive.. Infrequent coverage. TIR window channel(s) around 11 micrometers
Land surface temperature 4 - fair Cloud sensitive.. Infrequent coverage. TIR split window channels around 11 micrometers for water vapour correction
Precipitation intensity at surface (liquid or solid) 3 - high Convective precipitation dominant.. Calibration by MW needed. TIR channel(s). Frequent sampling (GEO) consistent with precipitation temporal variability
Sea surface temperature 4 - fair Cloud sensitive.. Infrequent coverage. TIR split window channels for water vapour correction
Integrated Water Vapour (IWV) 4 - fair Cloud sensitive.. Low troposphere dominant.. Infrequent coverage. TIR channels in the 11 micrometers split window
Instrument: MX-LWIR