WMO OSCAR | Details for Instrument ILAS-I

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Instrument: ILAS-I

Instrument details

Acronym	ILAS-I
Full name	Improved Limb Atmosperic Spectrometer - I
Purpose	Atmospheric chemistry. Species: CH4, CFC11, H2O, HNO3, N2O, NO2, O3 and aerosol
Short description	Two grating spectrometers: one in the IR range 6.21-11.77 µm (850-1610 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	New development
Scanning Technique	Limb sounding by sun occultation. Simultaneous vertical scanning by linear array detectors. About 30 occultations/day
Resolution	Vertical: 2 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	130 kg	Power	78 W	Data Rate	517 kbps

Providing Agency	JAXA
Instrument Maturity	Flown on an R&D satellite
Utilization Period:	1996 to 1997
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

Advanced Earth Observing Satellite (original name: “Midori”) (JAXA)
- ADEOS (see instrument status) Nov 1996 - Jun 1997

Instrument classification

Earth observation instrument
Limb sounders
Limb sounder

WIGOS Subcomponents

Subcomponent 2
UV/VIS/NIR/IR/MW limb sounders
UV/VIS/NIR/IR occultation limb sounder

Mission objectives

Primary mission objectives

C2H2
C2H6
CFC-11
CFC-12
CH4 mole fraction
CO2 mole fraction
COS
H2O
HNO3
N2O mole fraction
NO2
O3
PAN
SF6
SO2

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	5 - marginal	Limited to high atmosphere.. Limited to high latitudes.	TIR limb sounding by solar occultation. Self-calibrating
C2H6*	5 - marginal	Limited to high atmosphere.. Limited to high latitudes.	TIR spectrometry. C2H6 lines around 12 micrometers. Limb sounding by solar occultation. Self-calibrating
CH4 mole fraction*	5 - marginal	Limited to high atmosphere.. Limited to high latitudes.	TIR spectrometry. CH4 lines around 7.7 micrometers. Limb sounding by solar occultation. Self-calibrating
COS*	5 - marginal	Limited to high atmosphere.. Limited to high latitudes.	TIR spectrometry. COS lines around 11.6 micrometers. Limb sounding by solar occultation. Self-calibrating
N2O mole fraction*	5 - marginal	Limited to high atmosphere.. Limited to high latitudes.	TIR spectrometry. N2O lines around 7.7 micrometers. Limb sounding by solar occultation. Self-calibrating
PAN*	5 - marginal	Limited to high atmosphere.. Limited to high latitudes.	MWIR and TIR spectrometry. PAN lines around 5.7, 8.6 and 12.5 micrometers. Limb sounding by solar occultation. Self-calibrating
PSC occurrence	5 - marginal	Limited to high atmosphere.. Limited to high latitudes.	TIR spectrometry. Limb sounding by solar occultation. Self-calibrating
Specific humidity	5 - marginal	Limited to high atmosphere.. Limited to high latitudes.	TIR spectrometry in the water vapour band around 6.3 micrometers Limb sounding by solar occultation, Self-calibrating
CO2 mole fraction*	5 - marginal	Limited to high atmosphere.	TIR spectrometry. CO2 lines around 15 micrometers. Limb sounding by solar occultation. Self-calibrating
C2H2*	5 - marginal	Limited to high atmosphere.	TIR spectrometry. C2H2 lines around 7.5 and 13.7 micrometers. Limb sounding by solar occultation. Self-calibrating
CFC-11*	5 - marginal	Limited to high atmosphere.	TIR spectrometry. CFC-11 lines around 9.2 and 11.7 micrometers Limb sounding by solar occultation. Self-calibrating
CFC-12*	5 - marginal	Limited to high atmosphere.	TIR spectrometry. CFC-12 lines around 8.8 and 10.8 micrometers. Limb sounding by solar occultation. Self-calibrating
SF6*	5 - marginal	Limited to high atmosphere.	TIR spectrometry. SF6 lines around 10.5 micrometers. Limb sounding by solar occultation. Self-calibrating
H2O*	5 - marginal	Limited to high atmosphere.	MWIR/TIR spectrometry in a range centred on 6.3 micrometers. Limb sounding by solar occultation. Self-calibrating
O3*	5 - marginal	Limited to high atmosphere.	TIR spectrometry. Ozone band around 9.7 micrometers. Limb sounding by solar occultation. Self-calibrating
SO2*	5 - marginal	Limited to high atmosphere.	TIR spectrometry. SO2 lines around 7.3 and 8.6 micrometers. Limb sounding by solar occultation. Self-calibrating
HNO3*	5 - marginal	Limited to high atmosphere.	MWIR and TIR spectrometry. HNO3 lines around 5.9, 7.6 and 11.3 micrometers. Limb sounding by solar occultation. Self-calibrating
N2O5	5 - marginal	Limited to high atmosphere.	MWIR and TIR spectrometry. N2O5 lines around 5.8 and 8 micrometers. Limb sounding by solar occultation. Self-calibrating
NO2*	5 - marginal	Limited to high atmosphere.	TIR spectrometry. NO2 lines around 6.1 micrometers. Limb sounding by solar occultation. Self-calibrating

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