NOAA Polar Orbiter Data User's Guide

Section 1.4.4

Blue line drawn across page to separate text from document title.
Image denotes media you're currently using--Web or CD. Introduction Page, NOAA POD Guide TOC, Acronyms
Previous Section, Next Section

1.4.4 NOAA-8

Operational dates:

May 3, 1983 - June 21, 1984
July 1, 1985 - October 31, 1985

Morning orbit: 1930 LST ascending node, 0730 LST descending node

AVHRR instrument: 4 channels

Spacecraft ID: 6

Abnormalities: Primary oscillator began to operate sporadically on June 12, 1984. Between June 12 and 21, 1984, a small amount of GAC, LAC, and TOVS data were recorded. At this point NOAA-8 was turned off. It was not until July 1, 1985 that NOAA-8 was reactivated and all instruments checked out except the HIRS/2 instrument. Due to detector heating while the spacecraft tumbled, channels 1-12 of the HIRS/2 were lost.

Table 1.4.4-1 contains the central wave numbers for the AVHRR IR channels for NOAA-8. Table 1.4.4-2 contains the TOVS channel spectral response and HIRS/2 thermal band-correction coefficients for NOAA-8. Non-linearity errors for NOAA-8 AVHRR Channel 4 are contained in Table 1.4.4-3. Table 1.4.4-4 contains values of the corrected radiance of space, Nsp (which includes the non-linearity correction) for the NOAA-8 AVHRR IR channels.

Figures 1.4.4-1 through 1.4.4-4 contain the spectral response curves for NOAA-8 channels 1 through 4, respectively.

Table 1.4.4-1. NOAA-8 Central Wave Numbers for AVHRR IR Channels.
Temperature Range (K) Channel 3 (cm-1) Channel 4 (cm-1)
180-225 2631.52 913.360
225-275 2636.05 913.865
275-320 2639.18 914.305

Table 1.4.4-2. NOAA-8 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 1 667.41 cm-1 15 micrometers 0.099 0.99971
2 679.45 cm-1 CO2 Band 0.147 0.99962
3 690.90 cm-1 CO2 Band 0.143 0.99964
4 702.97 cm-1 CO2 Band 0.010 0.99991
5 717.56 cm-1 CO2 Band -0.001 0.99994
6 732.97 cm-1 CO2 Band 0.193 0.99955
7 747.90 cm-1 CO2 Band -0.104 1.00013
8 901.08 cm-1 Window 0.429 0.99931
9 1027.11 cm-1 Ozone 0.140 0.99984
10 1224.05 cm-1 Water Vapor 0.450 0.99988
11 1366.17 cm-1 Water Vapor 0.108 0.99978
12 1486.92 cm-1 Water Vapor 0.530 1.00008
13 2189.28 cm-1 4.3 micrometers 0.051 1.00022
14 2211.71 cm-1 CO2 Band 0.063 1.00029
15 2238.06 cm-1 CO2 Band 0.015 0.99992
16 2271.43 cm-1 CO2 Band 0.029 1.00004
17 2357.11 cm-1 CO2 Band 0.018 0.99993
18 2515.53 cm-1 Window 0.080 1.00007
19 2661.85 cm-1 Window 0.489 1.00061
20 14355.00 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 1.4.4-3. Non-linearity errors for NOAA-8 Channel 4.
Target temperature (K) Error (K)
315 0.8
305 0.3
295 -0.1
285 -0.3
275 -0.4
255 -0.4
235 0.2
225 0.7
205 2.2
0 0.0

Table 1.4.4-4. Corrected values for NOAA-8 Nsp.
Channel Nsp (mW/(m2-sr-cm-1))
3 0.0
4 -2.784

Table 1.4.4-5. PRT coefficients for all instruments on NOAA-8 (from NESS 107, App. B).
AVHRR
PRT counts to temperature coefficients
PRT a0 a1 a2 a3 a4
1 276.585 0.05136 -9.99E-8 0.0 0.0
2 276.605 0.05122 6.86E-8 0.0 0.0
3 276.591 0.05133 -1.381E-7 0.0 0.0
4 276.592 0.05133 -1.489E-7 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 -2.784
5 -2.784
HIRS
IWT PRT Count to temperature coefficients
PRT a0 a1 a2 a3 a4
1 301.77 7.1073E-03 3.9559E-07 9.4570E-11 0.0
2 302.23 7.7872E-03 7.1948E-07 1.3802E-10 0.0
3 302.27 7.7709E-03 7.0700E-07 1.3688E-10 0.0
4 301.71 6.9976E-03 3.3206E-07 8.6808E-11 0.0
SSU
PRT count to temperature coefficients
a0 a1 a2
285.2978 4.817E-03 1.119E-08
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 29.4857 .4247172 .320960E-04
2A 29.3123 .4326844 .3282283E-04
1B 29.3471 .4247339 .3165123E-04
2B 27.9719 .4285466 .3095837E-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-8 spectral response curve for AVHRR Channel 1

Figure showing NOAA-8 spectral response curve for AVHRR Channel 2

Figure showing NOAA-8 spectral response curve for AVHRR Channel 3

Figure showing NOAA-8 spectral response curve for AVHRR Channel 4

Amended May 5, 1999


Previous Section Top of Page Next Section