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 3.75–15.4 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) 0.07–0.40 K from 3.75–11 μm; 0.27–0.68 K from 11.75–15.4 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: 0.40–0.44 μm; Channel 2: 0.58–0.68 μm; Channel 3: 0.71–0.92 μm; Channel 4: 0.49–0.94 μm

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

Radiometric Accuracy
10%

Data Volume
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 23.8–89 GHz

Bandwidth
Channels 1–9: 160–400 MHz; Channels 10–14: 12–150 MHz; Channel 15: 2000 MHz

Sensitivity
(NEdT) 0.1–1 K (9/15 channels < 0.25 K)

Data Volume
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 150–183.3 GHz

Bandwidth
0.5–2.0 GHz

Sensitivity
(NEdT) 0.28–0.58 K

Data Volume
1.7 MB per granule, 408 MB per day