AIRS Instrument Specs


AIRS-AMSU-HSB Instrument Suite


Launch Date
May 4, 2002

Orbit
705 kilometers polar orbit, Sun synchronous, 98.2 ± 0.1 degree inclination, ascending node: 1:30 pm, period: 98.88 minutes

Swath Width 
1650 km (± 49.5 degrees)

Ground Coverage
> 95% global daily

Temporal Coverage
global, twice daily swath (day and night)

Design Life
AIRS: 5 years
AMSU-A and HSB: 3 years


AIRS Infrared Radiances


Spatial Resolution 
13.5 km at nadir; 41 km x 21.4 km at scan extremes

Spatial Sampling 
90 1.1˚ footprints per 2.67 seconds scan

Spectral Range 2378 channels from 3.7515.4 μm (2665-650 cm-¹)

Spectral Resolution 
λ / ∆λ ≈ 1200 nominal 

Spectral Sampling 
λ / ∆λ ≈ 2400 nominal

Spectral Accuracy 
± 1 ppm

Radiometric Accuracy 
< 0.2 K 3 sigma at 265 K

Radiometric Stability 
10 mK/year

Radiometric Sensitivity 
(NEdT @ 250 K) 0.070.40 K from 3.7511 μm; 0.270.68 K from 11.7515.4 μm

Data Volume 
56 MB per granule, 13.4 GB per day


AIRS Visible and Near-Infrared Radiances


Spatial Resolution 
2.3 x 1.8 km (across-track, along-track) 

Spatial Sampling 
8 x 9 pixels per AIRS 13.5 km footprint

Spectral Range 
4 channels from 0.4
1.0 μm: Channel 1: 0.400.44 μm; Channel 2: 0.580.68 μm; Channel 3: 0.710.92 μm; Channel 4: 0.490.94 μm

Signal-to-Noise 
(ratio at albedo of 0.4) > 100

Radiometric Accuracy 
10%

Data Volum
11 MB per granule, 2.6 GB per day


AMSU-A Radiances


Spatial Resolution 
40.5 km at nadir  

Spatial Sampling 
30 footprints per scan

Spectral Range 
15 channels from 23.889 GHz

Bandwidth 
Channels 19: 160400 MHz; Channels 1014: 12150 MHz; Channel 15: 2000 MHz

Sensitivity 
(NEdT) 0.11 K (9/15 channels < 0.25 K)

Data Volum
0.6 MB per granule, 144 MB per day


HSB Radiances

Data set available from May 24, 2002 through February 5, 2003


Spatial Resolution 
13.5 km at nadir  

Spatial Sampling 
90 1.1˚ footprints per scan (2.67 seconds)

Spectral Range 
4 channels from 150183.3 GHz

Bandwidth 
0.52.0 GHz

Sensitivity 
(NEdT) 0.280.58 K

Data Volum
1.7 MB per granule, 408 MB per day