GLI-weighted solar irradiance table

GLI NASDA Calibration Team, (minor calculation error was fixed on 24 March 2003)
PDF file

We calculated GLI-band solar irradiances that have been weight-integrated the Thuillier-2002 solar spectral irradiance by spectral responses of every GLI bands. The GLI spectral response is running averaged +/-2 samples (data interval is about 1nm) window to reduce a measurement noise, and both response and solar irradiance datasets are linearly interpolated to 0.1nm spectral resolution before the integration. The weighted integration is operated as follow.

F0 is the GLI-weighted solar irradiance, E0 the Thuillier-2002 solar spectral irradiance, Rb, GLI spectral response for band b, N1 and N2 are minimum and maximum wavelength where both the GLI response and Thuillier-2002 solar irradiance are available. From channel 30 (3.7um) to 36 (12um) where Thuillier 2002 cannot cover, we used MODTRAN 4.0 for the calculation.

The calculated F0 are shown in Table 1. GLI calibration group will use the following F0 (*1). However, another F0 (*2) integrated within +/-2Dl (Dl is width of half peak power) are used when the precision is enough for the analysis target.

Table 1: Calculated channel-weighted solar irradiance values for all GLI channels

GLI channel	F0 [W m-2um-1] *1	F0 [W m-2um-1] +/-2Dl*2	source
1	1095.696	1095.088	Thuillier 2002
2	1540.339	1540.261
3	1714.570	1714.271
4	1885.797	1885.786
5	2082.035	2082.209
6	1939.790	1939.741
7	1792.522	1792.354
8	1858.035	1858.094
9	1788.986	1788.717
10	1651.198	1651.271	Thuillier 2002
11	1522.468	1522.999
12	1474.721	1474.566
13	1479.008	1478.794
14	1394.024	1393.808
15	1396.239	1396.006
16	1274.120	1274.033
17	1248.869	1248.857
18	956.023	956.079
19	956.757	957.039
20	1965.331	1965.345	Thuillier 2002
21	1838.794	1838.836
22	1532.625	1532.605
23	1061.675	1061.651
24	654.572	654.581	Thuillier 2002
25	547.602	547.606
26	454.842	454.750
27	363.501	363.498
28	233.004	233.004	Thuillier 2002
29	86.684	86.684
30	11.596	11.576	MODTRAN4.0
31	1.164	1.164
32	0.835	0.835
33	0.760	0.759
34	0.441	0.440
35	0.185	0.185
36	0.121	0.120

Reference
Thuillier, G., M. Hers, P. C. Simon, D. Labs, H. Mandel, D. Gillotay, and T. Foujols, The solar spectral irradiance from 200 to 2400 nm as measured by the SOLSPEC spectrometer from the ATLAS 1-2-3 and EURECA missions, Solar Physics, to be submitted, 2002.
Berk, A., and co-authors, 1999: MODTRAN4 radiative transfer modeling for atmospheric correction, SPIE proceeding, Optical Spectrocopic, Techniques and Instrumentation for Atmospheric and Space Research III, Volume 3756.