NOAA Polar Orbiter Data User's Guide

Section 1.4.2

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

1.4.2 NOAA-6

Operational dates:

June 27, 1979 - March 5, 1983
July 3, 1984 - November 16, 1986

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

AVHRR instrument: 4 channels

Spacecraft ID: 2

Abnormalities: NOAA-6 was reactivated on July 3, 1984 to collect selected LAC/HRPT data because of the loss of NOAA-8.

Table 1.4.2-1 contains the central wave numbers for the AVHRR IR channels for NOAA-6. Table 1.4.2-2 contains the TOVS channel spectral response and HIRS/2 thermal band-correction coefficients for NOAA-6. Non-linearity errors for NOAA-6 AVHRR Channel 4 are contained in Table 1.4.2-3. Table 1.4.2-4 contains values of the corrected radiance of space, Nsp(which includes the non-linearity correction) for the NOAA-6 AVHRR IR channels.

Figures 1.4.2-1 through 1.4.2-4 contain the spectral response curves for NOAA-6 AVHRR channels 1 through 4, respectively.

Table 1.4.2-1. NOAA-6 Central Wave Numbers for AVHRR IR Channels.
Temperature Range (K) Ch. 3 (cm-1) Ch. 4 (cm-1)
180-225 2649.90 910.72
225-275 2653.90 911.41
275-320 2658.05 912.14

Table 1.4.2-2. NOAA-6 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 1 668.02 cm-1 15 micrometers 0.025 0.99992
2 679.94 cm-1 CO2 Band 0.151 0.99900
3 690.44 cm-1 CO2 Band 0.115 0.99970
4 704.69 cm-1 CO2 Band 0.041 0.99984
5 717.43 cm-1 CO2 Band -0.035 1.00000
6 732.47 cm-1 CO2 Band 0.066 0.99980
7 748.48 cm-1 CO2 Band -0.101 1.00012
8 900.64 cm-1 Window 0.185 0.99961
9 1029.48 cm-1 Ozone 0.268 0.99990
10 1217.77 cm-1 Water Vapor -0.205 0.99877
11 1368.05 cm-1 Water Vapor 0.073 0.99966
12 1485.76 cm-1 Water Vapor 0.597 1.00026
13 2190.60 cm-1 4.3 micrometers 0.022 1.00000
14 2210.09 cm-1 CO2 Band -0.001 0.99978
15 2237.76 cm-1 CO2 Band 0.029 0.99999
16 2269.43 cm-1 CO2 Band 0.015 0.99991
17 2360.42 cm-1 CO2 Band 0.011 0.99984
18 2514.97 cm-1 Window 0.051 0.99985
19 2654.58 cm-1 Window 0.482 1.00042
20 14453.14 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 1 669.998 cm-1/15 mb n/a n/a n/a
2 669.620 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 1.4.2-3. Non-linearity errors for NOAA-6 Channel 4.
Target temperature (K) Error (K)
315 0.8
305 0.5
295 0.3
285 0.0
275 -0.4
255 -0.8
245 -1.4
235 -1.4
225 -2.0
215 -2.0
205 -2.8
195 -2.6
185 -2.0
0 0.0

Table 1.4.2-4. Corrected values for NOAA-6 Nsp.
Channel Nsp (mW/(m2-sr-cm-1))
3 0.0
4 -2.18222

Table 1.4.2-5. PRT coefficients for all instruments on NOAA-6 (from NESS 107, App. B).
AVHRR
PRT counts to temperature (K) coefficients
PRT a0 a1 a2 a3 a4
1 278.3863101 3.1620496E-2 4.9133034E-5 0.0 0.0
2 278.2352898 3.0384174E-2 5.1555794E-5 0.0 0.0
3 278.0691316 4.2528998E-2 1.6065146E-5 0.0 0.0
4 277.6288372 4.0905453E-2 1.9771519E-5 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 -2.18222
5 -2.18222
HIRS
IWT PRT Count to temperature coefficients
PRT a0 a1 a2 a3 a4
1 301.3386 6.50696E-03 8.61837E-08 4.78285E-11 1.163E-15
2 301.368 6.496E-03 8.67631E-08 4.80667E-11 1.09312E-15
3 301.4294 6.49817E-03 8.5749E-08 4.7748E-11 1.15969E-15
4 301.382 6.4998E-03 8.60846E-08 4.7749E-11 1.1608E-15
SSU
PRT count to temperature coefficients
a0 a1 a2
284.1571 4.75532E-03 6.34256E-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 29.3271 .425427 .3165629E-04
2A 29.3083 .4260801 .314991E-04
1B 29.2923 .426132 .315241E-04
2B 29.3731 .4255765 .317602E-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-6 spectral response curve for Channel 1 AVHRR

Figure showing NOAA-6 spectral response curve for Channel 2 AVHRR

Figure showing NOAA-6 spectral response curve for Channel 3 AVHRR

Figure showing NOAA-6 spectral response curve for Channel 4 AVHRR

Amended May 5, 1999


Previous Section Top of Page Next Section