NOAA Polar Orbiter Data User's Guide

Section 1.4.5

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1.4.5 NOAA-9

Operational dates: February 25, 1985 - November 7, 1988

Afternoon orbit: 1420 LST ascending node, 0220 LST descending node

AVHRR instrument: 5 channels

Spacecraft ID: 7

Table 1.4.5-1 contains the central wave numbers for the AVHRR IR channels for NOAA-9. Table 1.4.5-2 contains the TOVS channel spectral response and HIRS/2 thermal band-correction coefficients for NOAA-9. Non-linearity errors for NOAA-9 AVHRR Channels 4 and 5 are contained in Table 1.4.5-3. Table 1.4.5-4 contains values of the corrected radiance of space, Nsp (which includes the non-linearity correction) for the NOAA-9 AVHRR IR channels.

Figures 1.4.5-1 through 1.4.5-5 contain the spectral response curves for NOAA-9 AVHRR channels 1 through 5, respectively.

Table 1.4.5-1. NOAA-9 Central Wave Numbers for AVHRR IR Channels.
Temperature Range (K) Channel 3 (cm-1) Channel 4 (cm-1) Channel 5 (cm-1)
180-225 2670.93 928.50 844.41
225-275 2674.81 929.02 844.80
275-320 2678.11 929.46 845.19

Table 1.4.5-2. NOAA-9 TOVS Channel Spectral Response and HIRS/2 Thermal Band-Correction Coefficients.
Instrument Channel # Central Wave # Description HIRS/2 Band-Correction Coefficients
b c
HIRS/2 1 667.67 cm-1 15 micrometers 0.034 0.99989
2 679.84 cm-1 CO2 Band 0.024 0.99991
3 691.46 cm-1 CO2 Band 0.092 0.99975
4 703.37 cm-1 CO2 Band 0.002 0.99993
5 717.16 cm-1 CO2 Band 0.013 0.99991
6 732.64 cm-1 CO2 Band -0.023 0.99997
7 749.48 cm-1 CO2 Band -0.006 0.99995
8 898.53 cm-1 Window 0.126 0.99969
9 1031.61 cm-1 Ozone 0.187 0.99987
10 1224.74 cm-1 Water Vapor 0.569 1.00010
11 1365.12 cm-1 Water Vapor 0.033 0.99961
12 1483.24 cm-1 Water Vapor 0.353 0.99911
13 2189.97 cm-1 4.3 micrometers -0.001 0.99980
14 2209.18 cm-1 CO2 Band 0.007 0.99984
15 2243.14 cm-1 CO2 Band 0.027 1.00003
16 2276.46 cm-1 CO2 Band 0.099 1.00038
17 2359.05 cm-1 CO2 Band 0.004 0.99977
18 2518.14 cm-1 Window 0.084 1.00012
19 2667.80 cm-1 Window 0.448 1.00040
20 14549.27 cm-1 Visible Window n/a n/a
MSU 1 1.6779 cm-1 n/a n/a n/a
2 1.7927 cm-1 n/a n/a n/a
3 1.8334 cm-1 n/a n/a n/a
4 1.9331 cm-1 n/a n/a n/a
SSU 1 669.988 cm-1/15 mb n/a n/a n/a
2 669.628 cm-1/5 mb n/a n/a n/a
3 669.357 cm-1/1.5 mb n/a n/a n/a

Table 1.4.5-3. Non-linearity errors for NOAA-9 Channels 4 and 5.
Target temperature (K) Channel 4 Error (K) Channel 5 Error (K)
315 1.8 1.0
305 0.9 0.6
295 0.2 0.2
285 -0.4 -0.1
275 -0.9 -0.5
255 -1.4 -0.8
245 -1.6 -1.0
225 -1.5 -1.3
205 -1.0 -1.4

Table 1.4.5-4. Corrected values for NOAA-9 Nsp.
Channel Nsp (mW/(m2-sr-cm-1))
3 0.0
4 -3.384
5 -2.313

Table 1.4.5-5. PRT coefficients for all instruments on NOAA-9 (from NESS 107, App. B).
AVHRR
PRT counts to temperature coefficients
PRT a0 a1 a2 a3 a4
1 277.018 0.05128 0.0 0.0 0.0
2 276.750 0.05128 0.0 0.0 0.0
3 276.862 0.05128 0.0 0.0 0.0
4 276.546 0.05128 0.0 0.0 0.0
PRT weighting factors
b1 b2 b3 b4
0.25 0.25 0.25 0.25
Radiance of space (Nsp) including nonlinearity correction
Channel Nsp(mW/sr-m2-cm-1)
3 0.0
4 -3.384
5 -2.313
HIRS
IWT PRT Count to temperature coefficients
PRT a0 a1 a2 a3 a4
1 301.38 6.5225E-03 8.6282E-08 4.8144E-11 0.0
2 301.37 6.5193E-03 8.5968E-08 4.8101E-11 0.0
3 301.38 6.5245E-03 8.6193E-08 4.8146E-11 0.0
4 301.37 6.5196E-03 8.5893E-08 4.8105E-11 0.0
SSU
PRT count to temperature coefficients
a0 a1 a2
284.249 4.889 x 10-3 2.6 x 10-9
Thermistor to temperature coefficients
b0 b1 b2 b3
375.969 -203.161 179.13 -85.16
c0 c1 c2 c3
375.969 -203.161 179.13 -85.16
MSU
PRT Count to resistance coefficients
K0 495.6
K1 107.8
PRT Resistance to temperature coefficients
  e0 e1 e2
1A 29.4294 .4283514 .3223351E-04
2A 29.2639 .4338180 .3334592E-04
1B 29.5416 .4248521 .3188156E-04
2B 29.5778 .4243732 .3264424E-04
Radiance of space (Nsp)
Channel Nsp( mW/sr- m2 - cm-1)
1 0.000086
2 0.000096
3 0.000084
4 0.000092

Figure showing NOAA-9 spectral response curve for AVHRR Channel 1

Figure showing NOAA-9 spectral response curve for AVHRR Channel 2

Figure showing NOAA-9 spectral response curve for AVHRR Channel 3

Figure showing NOAA-9 spectral response curve for AVHRR Channel 4

Figure showing NOAA-9 spectral response curve for AVHRR Channel 5

Amended May 5, 1999



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