View source for IASI

{{Infobox satellite instrument
| name = Infrared Atmospheric Sounding Interferometer
| acronym = IASI
| launch date = 
| orbit = 
| measurement period= 
|measurement principle=Fourier transform spectrometer<br>(3.4 -15.5 μm) 
|agency=ESA
|image =
|satellite=MetOp-A, MetOp-B
|launch date = 2006
}}

'''IASI'''  is a satellite FTIR.

IASI is on-board MetOp-A, a European meteorological satellite
that has been operational from 2007. MetOp-A is the
first of three satellites that are planned to operate for fourteen
years (MetOp-B was lauched on 17 September 2013).
It crosses the equator on the descending node at 9:30 a.m.
local time. IASI is a Fourier transform spectrometer that
covers the spectral range 645 to 2760 cm−1 (3.62–15.5 μm)
with a spectral sampling of 0.25 cm−1 and an apodized spectral
resolution of 0.5 cm−1 (Blumstein et al., 2004).<ref>
Blumstein, D., Chalon, G., Carlier, T., Buil, C., H´ebert, P., Maciaszek,
T., Ponce, G., Phulpin, T., Tournier, B., Sim´eoni, D., PAstruc,
Clauss, A., Kayal, G., and Jegou, R.: IASI Instrument: Technical
overview and measured performances, Proc. SPIE, 5543,
196–207, 2004. </ref>
It is specified to have a radiometric accuracy of 0.25–0.58K and
a field-of-view of 12 km at nadir. It has a 2200 km wide
swath and achieves near uniform global coverage in 12 h (although
there are some gaps between orbits near the Equator).
More information on IASI can be
founded in Clerbaux et al. (2009).<ref >Clerbaux, C., Boynard, A., Clarisse, L., George, M., Hadji-Lazaro,
J., Herbin, H., Hurtmans, D., Pommier, M., Razavi, A., Turquety,
S., Wespes, C., and Coheur, P.-F.: Monitoring of atmospheric
composition using the thermal infrared IASI/MetOp sounder, Atmos.
Chem. Phys., 9, 6041–6054, doi:10.5194/acp-9-6041-2009,
2009.</ref>

IASI level 1c data (geolocated and apodized spectra) can be obtained from
both the British Atmospheric Data Centre (BADC) archive
and EUMETSAT Unified Meteorological Archive Facility (UMARF) archive.

==References==
{{reflist|2}}

[[Category:satellite instrument]]