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Instrument: AIRS : Atmospheric Infrared Sounder
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Associated Platforms
AQUA

Spectral/Frequency Information
Wavelength Keyword: Visible
Number Channels: 2 Channels
Spectral/Frequency Coverage/Range: 0.4 μm - 0.68 μm
Spectral/Frequency Resolution: λ/Δλ 1200 nominal

Wavelength Keyword: Near Infrared
Number Channels: 2 Channels
Spectral/Frequency Coverage/Range: 0.71 μm - 0.94 μm
Spectral/Frequency Resolution: λ/Δλ 1200 nominal

Wavelength Keyword: Infrared > Thermal
Number Channels: 2378
Spectral/Frequency Coverage/Range: 3.74 μm - 15.4 μm
Spectral/Frequency Resolution: λ/Δλ 1200 nominal

Related Data Sets
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Description
The AIRS (Atmospheric Infrared Sounder) instrument is a high spectral resolution grating spectrometer containing 2378 infrared channels in the 3.74 to 15.4 micron spectral range for obtaining atmospheric temperature profiles and a variety of additional Earth/atmosphere products. AIRS is centered on measuring accurate temperature and humidity profiles throughout the atmosphere. AIRS also provides four visible/near-infrared channels (0.4 - 1.0 μm) to characterize cloud and surface properties.

Key AIRS Facts
Heritage: Advanced Moisture and Temperature Sounder (AMTS), High
Resolution Infrared Radiation Sounder (HIRS)
Instrument Type: Temperature controlled (155 K) array grating spectrometer, plus a visible/near-infrared photometer
Aperture: 10 cm
Swath Width: 1650 km
Coverage: Global coverage every 1 to 2 days
Spatial Resolution: Infrared: 13.5 km at nadir; Visible/near-infrared: 2.3 km at nadir
Dimensions: 116.5 cm x 80 cm x 95.3 cm
Mass: 177 kg
Power: 180/220 W (beginning/end of life)
Duty Cycle: 100%
Field of View (FOV): ± 49.5° cross-track from nadir
Instrument IFOV (track/scan): Infrared: 1.1° x 0.6° (13.5 km x 7.4 km at nadir); Visible/near-infrared: 0.149° x 0.190° (1.8 km x 2.3 km at nadir)
Scan Period: 2.667 s
Scan Sampling (scan/track): Infrared: 90 x 1 (1.1° spacing), in 2 s; visible/near-infrared: 720 x 9 (0.138° x 0.185° spacing), in 2 s
Design Life: 5 years

Online Resources
http://airs.jpl.nasa.gov/
http://aqua.nasa.gov/about/instrument_airs.php
http://disc.gsfc.nasa.gov/AIRS/index.shtml
http://mirador.gsfc.nasa.gov/cgi-bin/mirador/presentNavigation.pl?tree=project&project=AIRS

Instrument Logistics
Data Rate: 1.27 Mbps
Instrument Start Date: 2002-08-31
Instrument Owner: USA/NASA