CEOS EO HANDBOOK – INSTRUMENT SUMMARY
- ILAS-II
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Full Name
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Improved Limb Atmospheric Spectrometer-II
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Status
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No longer operational
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Instrument Agencies
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MOE (Japan) , JAXA
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Maturity
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Instrument Type
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Atmospheric chemistry 
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Geometry
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Occultation
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Instrument Technology
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Limb-scanning IR spectrometer
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Sampling
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Sounding
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Data Access
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Data Format
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Measurements and Applications
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Measures minor trace gas species at high latitudes, in the altitude range 10 - 60 km (O3, CH4, NO2, N2O, H2O, CFC11, HNO3, CIONO2, N2O5, aerosols, temparature, pressure).
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Resolution Summary
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Vertical: 1 km Temparature, aerosols, pressure: 2 km (horiz), CIONO2: 21.7 km (horiz), Others: 13 km (horiz)
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Swath Summary
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Accuracy Summary
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Temperature: 0.2 K, Pressure: 1%, Aerosol: 2%, Ozone: 3 - 5%, Other trace gases: 2 - 25%
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Waveband Summary
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VIS: 0.753 - 0.784 µm, MWIR - TIR: 3.0 - 5.7 µm, 6.21 - 11.76 µm, 12.78 - 12.85 µm
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| NIR (~0.75 µm - ~1.3 µm) |
| MWIR (~3.0 µm - ~6.0 µm) |
| TIR (~6.0 µm - ~15.0 µm) |
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Instrument Measurements
Measurements Overview
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| Category | Parameter |
| Aerosols | Aerosol Extinction / Backscatter (column/profile)   |
| Aerosol absorption optical depth (column/profile) |
| Atmospheric Humidity Fields | Atmospheric specific humidity (HT, LS, HS&M) |
| Atmospheric Temperature Fields | Atmospheric temperature (HT, LS, HS&M) |
| Ozone | O3 Mole Fraction |
| Trace gases (excluding ozone) | CH4 Mole Fraction |
| CFC-11 (HT, LS, HS&M) |
| CFC-12 (HT, LS, HS&M) |
| NO2 Mole Fraction |
| N2O (HT, LS, HS&M) |
| HNO3 (HT, LS, HS&M) |
| ClONO2 (HT, LS, HS&M) |
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Instrument Missions
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