NOAA Polar Orbiter Data User's Guide
Section 1.4.1
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1.4.1 TIROS-N
Operational dates: October 19, 1978 to January 30, 1980
Afternoon orbit: 1500 LST ascending node, 0300 LST descending
node
AVHRR instrument: 4 channels
Spacecraft ID: 1
Table 1.4.1-1 contains the central wave numbers for the AVHRR IR
channels for TIROS-N. Table 1.4.1-2 contains the TOVS channel
spectral response and HIRS/2 thermal band-correction coefficients
for TIROS-N. Non-linearity errors for TIROS-N AVHRR Channel 4 are
contained in Table 1.4.1-3. Table 1.4.1-4 contains values of the
corrected radiance of space, Nsp (which includes the
non-linearity correction) for the TIROS-N AVHRR IR channels.
Figures 1.4.1-1 through 1.4.1-4 contain the spectral response
curves for the TIROS-N AVHRR channels 1 through 4,
respectively.
Table 1.4.1-1. TIROS-N Central Wave Numbers for AVHRR IR
Channels.
| Temperature Range (K) |
Ch. 3 (cm-1) |
Ch. 4 (cm-1) |
| 180-225 |
2631.81 |
911.13 |
| 225-275 |
2635.15 |
911.54 |
| 275-320 |
2638.05 |
912.01 |
Table 1.4.1-2. TIROS-N 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 |
668.00 cm-1 |
15 micrometers |
0.047 |
0.99986 |
| 2 |
679.23 cm-1 |
CO2 Band |
0.067 |
0.99979 |
| 3 |
691.12 cm-1 |
CO2 Band |
0.131 |
0.99962 |
| 4 |
703.56 cm-1 |
CO2 Band |
0.015 |
0.99991 |
| 5 |
716.05 cm-1 |
CO2 Band |
0.010 |
0.99993 |
| 6 |
732.38 cm-1 |
CO2 Band |
0.092 |
0.99974 |
| 7 |
748.27 cm-1 |
CO2 Band |
-0.101 |
1.00015 |
| 8 |
897.71 cm-1 |
Window |
-0.252 |
1.00013 |
| 9 |
1027.87 cm-1 |
Ozone |
0.118 |
0.99978 |
| 10 |
1217.10 cm-1 |
Water Vapor |
-0.132 |
0.99908 |
| 11 |
1363.69 cm-1 |
Water Vapor |
0.136 |
0.99982 |
| 12 |
1484.35 cm-1 |
Water Vapor |
0.424 |
0.99948 |
| 13 |
2190.43 cm-1 |
4.3 micrometers |
-0.015 |
0.99969 |
| 14 |
2212.65 cm-1 |
CO2 Band |
0.041 |
1.00011 |
| 15 |
2240.15 cm-1 |
CO2 Band |
0.074 |
1.00032 |
| 16 |
2276.27 cm-1 |
CO2 Band |
0.143 |
1.00057 |
| 17 |
2360.63 cm-1 |
CO2 Band |
0.060 |
1.00025 |
| 18 |
2511.95 cm-1 |
Window |
0.110 |
1.00020 |
| 19 |
2671.18 cm-1 |
Window |
0.650 |
1.00175 |
| 20 |
14367.00 cm-1 |
Visible Window |
n/a |
n/a |
| MSU |
1 |
1.6599 cm-1 |
n/a |
n/a |
n/a |
| 2 |
1.7734 cm-1 |
n/a |
n/a |
n/a |
| 3 |
1.6488 cm-1 |
n/a |
n/a |
n/a |
| 4 |
1.7385 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 1.4.1-3. Non-linearity errors for TIROS-N Channel
4.
| Target temperature (K) |
Error (K) |
| 304.9 |
1.25 |
| 294.9 |
0.98 |
| 285.0 |
0.0 |
| 275.1 |
-0.03 |
| 264.9 |
-0.08 |
| 255.1 |
-0.10 |
| 234.9 |
-0.75 |
| 224.9 |
-0.95 |
| 204.9 |
-1.67 |
| 0.0 |
0.0 |
Table 1.4.1-4. Corrected values for TIROS-N
Nsp.
| Channel |
Nsp
(mW/(m2-sr-cm-1)) |
| 3 |
0.0 |
| 4 |
-1.151 |
Table 1.4.1-5. PRT coefficients for all instruments on
TIROS-N (from NESS 107, App. B).
| AVHRR |
| PRT counts to temperature coefficients |
| PRT |
a0 |
a1 |
a2 |
a3 |
a4 |
| 1 |
277.73 |
0.047752 |
8.29E-6 |
0.0 |
0.0 |
| 2 |
277.41 |
0.046637 |
11.01E-6 |
0.0 |
0.0 |
| 3 |
277.14 |
0.045188 |
14.77E-6 |
0.0 |
0.0 |
| 4 |
277.42 |
0.046387 |
10.59E-6 |
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 |
-1.151 |
| 5 |
-1.151 |
| HIRS |
| IWT PRT Count to temperature coefficients |
| PRT |
a0 |
a1 |
a2 |
a3 |
a4 |
| 1 |
301.4624 |
6.51558E-03 |
9.15434E-08 |
4.71066E-11 |
6.83373E-16 |
| 2 |
301.3504 |
6.51439E-03 |
9.15816E-08 |
4.70945E-11 |
6.85893E-16 |
| 3 |
301.425 |
6.51738E-03 |
9.16252E-08 |
4.71175E-11 |
6.87601E-16 |
| 4 |
301.4035 |
6.52364E-03 |
9.00018E-08 |
4.71042E-11 |
6.61634E-16 |
| SSU |
| PRT count to temperature coefficients |
| a0 |
a1 |
a2 |
| 285.082 |
4.5542E-03 |
9.6285E-09 |
| 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 |
29.10 |
.42596 |
.3187E-04 |
| 2A |
27.55 |
.42787 |
.3185E-04 |
| 1B |
29.05 |
.42710 |
.3206E-04 |
| 2B |
28.95 |
.42836 |
.3175E-04 |
| Radiance of space (Nsp) |
| Channel |
Nsp( mW/sr- m2 -
cm-1) |
| 1 |
0.000086 |
| 2 |
0.000096 |
| 3 |
0.000084 |
| 4 |
0.000092 |
Amended May 5,
1999