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

Figure showing TIROS-N spectral response curve for Channel 1 AVHRR

Figure showing TIROS-N spectral response curve for Channel 2 AVHRR

Figure showing TIROS-N spectral response curve for Channel 3 AVHRR

Figure showing TIROS-N spectral response curve for Channel 4 AVHRR

Amended May 5, 1999

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