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Table 1 Instrument Characteristics of HIRS and IASI onMetOp Satellite
	HIRS	IASI
Spectral Coverage	19 IR channels (670cm^-1 ~ 2663cm^-1)	8461 channels (546 cm^-1 ~ 2760cm^-1)
Instantaneous Field of view	0.7⁰, 10km at nadir	0.8⁰, 12km at nadir
Scan rate	6.4 seconds	8 seconds
Cross-track scan coverage	±49.5⁰, 56 footprints per scan-line	Spectral Calibration: Atmospheric spectral feature Radiometric Cal: Space-view, blackbody

Table 2 Empirical values of non-linearity coefficient, pre-launch measured values of non-linearity coefficient, and the channel dynamical ranges of the HIRS long-wave CO₂ channels and window channel for the MetOp? orbit (06:41 November 23, 2009)
CH	Blackbody Bias (K)	SRF shift (cm^-1)	Optimal Non-lin. Term Value (E-8)
4	0.142	-0.13	7.396
5	0.142	0.09	5.884
6	0.142	N/A	4.581
7	0.142	-0.15	4.913
8	0.142	N/A	6.767

Topic revision: 02 Dec 2011, ChrisChen

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