BackForwardInstrument:  ILAS-II 

Instrument details
Acronym ILAS-II
Full name Improved Limb Atmosperic Spectrometer - II
Purpose Atmospheric chemistry. Species: CH4, CFC11, CFG-12, ClONO2, H2O, HNO3, N2O, NO2, O3 and aerosol
Short description Four grating spectrometers three in the IR ranges 12.78-12.85 µm (778.2-782.4 cm-1), 6.21-11.76 µm (850-1610 cm-1) and 3.0-5.7 µm (1754-3330 cm-1) with spectral resolution 0.2 cm-1; the other one with 1024 NIR channels in the range 0.753-0.784 µm
Background Follow-on of ILAS-1 flown on ADEOS
Scanning Technique Limb sounding. Simultaneous vertical scanning by linear array detectors
Resolution Vertical: 1 km in the volume 10-60 km; horizontal: 300 km along-view
Coverage / Cycle Latitudinal zones 56-70 ºN and 63-88 ºS, once each 3 days
Mass 138 kg Power 120 W Data Rate 453.7 kps

 

Providing Agency JAXA
Instrument Maturity Flown on an R&D satellite
Utilization Period: 2003 to 2003-10-25
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
  • C2H2
  • C2H6
  • CFC-11
  • CFC-12
  • CO2
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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
C2H25 - marginalLimited to high atmosphere.TIR spectrometry. C2H2 lines around 7.5 and 13.7 micrometers. Limb sounding mechanically or electronically
C2H65 - marginalLimited to high atmosphere.MWIR and TIR spectrometry. C2H6 lines around 3.3 and 12 micrometers.
CFC-115 - marginalLimited to high atmosphere.TIR spectrometry. CFC-11 lines around 9.2 and 11.7 micrometers. Limb sounding mechanically or electronically
CFC-125 - marginalLimited to high atmosphere.TIR spectrometry. CFC-12 lines around 8.8 and 10.8 micrometers.
ClONO25 - marginalLimited to high atmosphere.MWIR and TIR spectrometry. ClONO2 lines around 5.7, 7.7 and 12.5 micrometers.
COS5 - marginalLimited to high atmosphere.MWIR and TIR spectrometry. COS lines around 4.8 and 11.6 micrometers.
HNO35 - marginalLimited to high atmosphere.MWIR and TIR spectrometry. HNO3 lines around 5.9, 7.6 and 11.3 micrometers.
N2O55 - marginalLimited to high atmosphere.MWIR and TIR spectrometry. N2O5 lines around 5.8 and 8 micrometers.
NO5 - marginalLimited to high atmosphere.MWIR spectrometry. NO lines around 5.3 micrometers.
NO25 - marginalLimited to high atmosphere.TIR spectrometry. NO2 lines around 6.1 micrometers.
O34 - fairLimited to high atmosphere.TIR spectrometry. Ozone band around 9.7 micrometers. Limb sounding mechanically or electronically
PAN5 - marginalLimited to high atmosphere.MWIR and TIR spectrometry. PAN lines around 5.7, 8.6 and 12.5 micrometers.
PSC occurrence4 - fairLimited to high atmosphere.MWIR and TIR spectrometry. Limb sounding mechanically or electronically
SF65 - marginalLimited to high atmosphere.TIR spectrometry. SF6 lines around 10.5 micrometers. Limb sounding mechanically or electronically
SO25 - marginalLimited to high atmosphere.TIR spectrometry. SO2 lines around 7.3 and 8.6 micrometers.
Atmospheric temperature4 - fairLimited to high atmosphere.MWIR and TIR spectrometry.
Specific humidity4 - fairLimited to high atmosphere.MWIR and TIR spectrometry in the water vapour band around 6.3 micrometers