Jos H. G. M. van Geffen, "Wavelength calibration of spectra measured by the Global Ozone Monitoring Experiment: variations along orbits and in time," Appl. Opt. 43, 695-706 (2004)
The nadir-viewing Global Ozone Monitoring Experiment spectrometer aboard the second European Remote Sensing satellite measures spectra in the range of 240–790 nm. For the near-real-time delivery of ozone columns and profiles at the Royal Netherlands Meteorological Institute, a wavelength-calibration method was developed that allows for variation in both location and width of the spectral bins along the detector. The resultant wavelength grid of earthshine spectra varies along an orbit. This variation shows a correlation with instrument temperatures for a window near 306 nm; for other wavelength windows there is no correlation. The wavelength grid of calibrated solar spectra shows fluctuations without an apparent pattern and no correlation with instrument degradation.
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Parametersa of the Four Detector Channels of the GOME Instrument
Channel
Wavelength Range (nm)
Pixel Size (nm)
Resolution (nm)
Number of Points
1
237–315
0.11
0.17
695
2
313–405
0.12
0.17
841
3
407–608
0.22
0.30
1024
4
599–794
0.22
0.35
1024
That is, wavelength ranges, approximate detector pixel size, and spectral resolution of the GOME for each channel. The rightmost column lists the number of data points (detector pixels) for each channel in GDP level-1 spectra.
Table 2
Definition of the Nine EGOI Windows Used Since June 1998 for the Near-Real Time FDS at KNMIa
Window Number
Wavelength Range (nm)
Width (nm)
Number of Points
Band
1
272.16–275.91
3.75
35
1a
2
282.93–285.55
2.62
25
1b
3
292.51–302.96
10.45
98
1b
4
305.31–307.87
2.56
25
1b
5
311.92–314.46
2.54
25
1b
6
323.13–336.22
13.09
116
2b
7
351.64–352.76
1.12
11
2b
8
372.32–373.42
1.10
11
2b
9
758.00–778.50
20.50
99
4
The fourth column lists the number of data points (detector pixels) in each window, which totals 445. Apart from these nine windows, the EGOI data contain all instrument health parameters, such as system temperatures, and polarization information.
Table 3
Frequencies of Coefficients of Correlation between Wavelength Change Δλ As a Result of Wavelength Calibration and Predisperser Prism’s Temperature T for all 43 Orbits of 1–3 March 2000 for Each of the Nine Wavelength Windows nwa
Correlation Coefficient
nw
1
2
3
4
5
6
7
8
9
-1.0 to -0.9
0
0
0
31
1
0
0
0
0
-0.9 to -0.7
0
2
7
9
0
0
0
6
0
-0.7 to -0.5
0
1
16
2
6
1
1
10
0
-0.5 to -0.3
0
6
11
0
10
1
8
10
2
-0.3 to -0.1
6
7
4
0
15
3
11
8
1
-0.1 to 0.1
5
10
4
1
8
6
14
5
3
0.1 to 0.3
11
4
0
0
2
11
7
3
2
0.3 to 0.5
10
8
1
0
1
10
1
0
17
0.5 to 0.7
7
3
0
0
0
7
1
0
11
0.7 to 0.9
4
2
0
0
0
4
0
1
6
0.9 to 1.0
0
0
0
0
0
0
0
0
1
The individual correlation coefficients are listed in Appendix A.
Table 4
Correlation Coefficients C(nw, no, nd = 1) for 1 March 2000
Here and in Tables
5 and 6, “All” means taking all orbits together in the computation of the coefficient.
Table 5
Correlation Coefficients C(nw, no, nd = 2) for 2 March 2000a
no
nw
1
2
3
4
5
6
7
8
9
1
-0.034
0.235
-0.845
-0.024
0.063
0.561
-0.458
-0.033
0.890
2
0.807
0.442
-0.235
-0.649
-0.212
0.296
-0.046
-0.223
0.425
3
0.455
0.249
-0.453
-0.720
-0.297
0.289
0.185
0.013
0.370
4
0.506
0.324
-0.805
-0.833
-0.312
0.201
0.114
-0.361
0.334
5
-0.195
-0.051
-0.648
-0.959
-0.306
0.139
-0.210
-0.291
0.007
6
0.277
0.563
-0.636
-0.938
-0.313
0.308
-0.056
-0.624
0.307
7
0.292
0.012
-0.522
-0.938
-0.012
0.275
-0.221
-0.550
0.550
8
0.017
-0.243
-0.433
-0.925
-0.643
0.040
-0.370
-0.698
0.424
9
-0.199
-0.279
-0.179
-0.939
-0.637
0.292
-0.091
-0.389
0.692
10
0.401
0.361
-0.486
-0.941
-0.609
0.651
0.008
-0.824
0.334
11
0.151
-0.027
-0.665
-0.935
-0.306
-0.223
-0.090
0.043
0.147
12
-0.240
0.395
-0.054
-0.931
-0.297
-0.056
0.342
-0.433
-0.475
13
0.344
-0.350
-0.689
-0.957
-0.094
0.584
-0.437
-0.431
0.758
14
-0.104
0.138
-0.702
-0.902
-0.182
0.393
-0.162
-0.453
0.489
15
0.083
-0.061
-0.548
-0.795
0.037
0.644
-0.170
-0.344
0.517
All
0.098
-0.040
-0.288
-0.597
-0.078
0.137
0.012
-0.196
0.298
The unusually small correlation coefficient for nw = 4 and no = 1 with respect to the coefficients for the same window in all other orbits of the three days may be due to an error in the EGOI data file.
Table 6
Correlation Coefficients C(nw, no, nd = 3) for 3 March 2000
no
nw
1
2
3
4
5
6
7
8
9
1
0.775
-0.017
-0.421
-0.649
-0.161
0.817
-0.153
-0.266
0.603
2
0.612
-0.190
-0.242
-0.762
-0.297
0.776
0.124
-0.271
0.625
3
0.487
-0.531
-0.511
-0.890
-0.477
0.652
-0.028
-0.441
0.426
4
0.383
-0.381
0.386
-0.885
-0.963
0.805
-0.173
0.896
0.726
5
0.641
-0.099
-0.524
-0.908
-0.221
0.355
0.157
-0.608
0.047
6
0.148
0.243
-0.784
-0.951
-0.167
0.260
-0.347
-0.675
0.371
7
-0.182
0.368
-0.524
-0.953
-0.547
-0.026
-0.193
-0.535
0.419
8
-0.118
-0.306
-0.527
-0.925
-0.234
0.223
-0.460
-0.287
0.480
9
0.185
-0.318
-0.409
-0.928
-0.005
0.349
0.252
-0.794
0.340
10
0.202
0.544
0.019
-0.893
-0.427
-0.641
0.061
0.110
-0.411
11
0.153
-0.315
-0.810
-0.926
0.410
0.507
-0.270
-0.199
0.770
12
0.489
0.879
-0.807
-0.964
-0.277
0.690
-0.700
-0.719
0.909
13
0.308
-0.478
-0.508
-0.947
-0.156
0.116
-0.257
-0.505
0.256
14
0.094
-0.133
0.023
-0.918
0.132
-0.053
-0.432
-0.566
0.508
All
-0.007
0.019
-0.300
-0.714
-0.118
0.198
-0.062
-0.257
0.304
Tables (6)
Table 1
Parametersa of the Four Detector Channels of the GOME Instrument
Channel
Wavelength Range (nm)
Pixel Size (nm)
Resolution (nm)
Number of Points
1
237–315
0.11
0.17
695
2
313–405
0.12
0.17
841
3
407–608
0.22
0.30
1024
4
599–794
0.22
0.35
1024
That is, wavelength ranges, approximate detector pixel size, and spectral resolution of the GOME for each channel. The rightmost column lists the number of data points (detector pixels) for each channel in GDP level-1 spectra.
Table 2
Definition of the Nine EGOI Windows Used Since June 1998 for the Near-Real Time FDS at KNMIa
Window Number
Wavelength Range (nm)
Width (nm)
Number of Points
Band
1
272.16–275.91
3.75
35
1a
2
282.93–285.55
2.62
25
1b
3
292.51–302.96
10.45
98
1b
4
305.31–307.87
2.56
25
1b
5
311.92–314.46
2.54
25
1b
6
323.13–336.22
13.09
116
2b
7
351.64–352.76
1.12
11
2b
8
372.32–373.42
1.10
11
2b
9
758.00–778.50
20.50
99
4
The fourth column lists the number of data points (detector pixels) in each window, which totals 445. Apart from these nine windows, the EGOI data contain all instrument health parameters, such as system temperatures, and polarization information.
Table 3
Frequencies of Coefficients of Correlation between Wavelength Change Δλ As a Result of Wavelength Calibration and Predisperser Prism’s Temperature T for all 43 Orbits of 1–3 March 2000 for Each of the Nine Wavelength Windows nwa
Correlation Coefficient
nw
1
2
3
4
5
6
7
8
9
-1.0 to -0.9
0
0
0
31
1
0
0
0
0
-0.9 to -0.7
0
2
7
9
0
0
0
6
0
-0.7 to -0.5
0
1
16
2
6
1
1
10
0
-0.5 to -0.3
0
6
11
0
10
1
8
10
2
-0.3 to -0.1
6
7
4
0
15
3
11
8
1
-0.1 to 0.1
5
10
4
1
8
6
14
5
3
0.1 to 0.3
11
4
0
0
2
11
7
3
2
0.3 to 0.5
10
8
1
0
1
10
1
0
17
0.5 to 0.7
7
3
0
0
0
7
1
0
11
0.7 to 0.9
4
2
0
0
0
4
0
1
6
0.9 to 1.0
0
0
0
0
0
0
0
0
1
The individual correlation coefficients are listed in Appendix A.
Table 4
Correlation Coefficients C(nw, no, nd = 1) for 1 March 2000
Here and in Tables
5 and 6, “All” means taking all orbits together in the computation of the coefficient.
Table 5
Correlation Coefficients C(nw, no, nd = 2) for 2 March 2000a
no
nw
1
2
3
4
5
6
7
8
9
1
-0.034
0.235
-0.845
-0.024
0.063
0.561
-0.458
-0.033
0.890
2
0.807
0.442
-0.235
-0.649
-0.212
0.296
-0.046
-0.223
0.425
3
0.455
0.249
-0.453
-0.720
-0.297
0.289
0.185
0.013
0.370
4
0.506
0.324
-0.805
-0.833
-0.312
0.201
0.114
-0.361
0.334
5
-0.195
-0.051
-0.648
-0.959
-0.306
0.139
-0.210
-0.291
0.007
6
0.277
0.563
-0.636
-0.938
-0.313
0.308
-0.056
-0.624
0.307
7
0.292
0.012
-0.522
-0.938
-0.012
0.275
-0.221
-0.550
0.550
8
0.017
-0.243
-0.433
-0.925
-0.643
0.040
-0.370
-0.698
0.424
9
-0.199
-0.279
-0.179
-0.939
-0.637
0.292
-0.091
-0.389
0.692
10
0.401
0.361
-0.486
-0.941
-0.609
0.651
0.008
-0.824
0.334
11
0.151
-0.027
-0.665
-0.935
-0.306
-0.223
-0.090
0.043
0.147
12
-0.240
0.395
-0.054
-0.931
-0.297
-0.056
0.342
-0.433
-0.475
13
0.344
-0.350
-0.689
-0.957
-0.094
0.584
-0.437
-0.431
0.758
14
-0.104
0.138
-0.702
-0.902
-0.182
0.393
-0.162
-0.453
0.489
15
0.083
-0.061
-0.548
-0.795
0.037
0.644
-0.170
-0.344
0.517
All
0.098
-0.040
-0.288
-0.597
-0.078
0.137
0.012
-0.196
0.298
The unusually small correlation coefficient for nw = 4 and no = 1 with respect to the coefficients for the same window in all other orbits of the three days may be due to an error in the EGOI data file.
Table 6
Correlation Coefficients C(nw, no, nd = 3) for 3 March 2000
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