This file generated: 10/04/2026

README file for SLSTR S3C filter functions
June 4th, 2025

Draft measured spectral responses of the nine standard channels S1 - S9
in the focal plane of the SLSTR FM04 instrument, to fly on the Sentinel 3C platform.
The responses of the fire channels F1 and F2 are identical to the responses of standard
channels S7 and S8. The responses are derived from measurements taken during a
spectral calibration campaign conducted at the STFC Rutherford Appleton Laboratory
(RAL) in December 2019 and January 2020, and July 2021.

SRFs are truncated (Note that ESA has swapped SRF between C and D spacecraft on March 30th 2026):
   SLSTR_S3D_S1_20211203.nc  0.515   0.595  vis
   SLSTR_S3D_S2_20211203.nc  0.619   0.699  vis
   SLSTR_S3D_S3_20211203.nc  0.825   0.905  vis
   SLSTR_S3D_S4_20211203.nc  1.345   1.405  vis
   SLSTR_S3D_S5_20211203.nc  1.490   1.730  vis
   SLSTR_S3D_S6_20211203.nc  2.150   2.350  vis
   SLSTR_S3D_S7_20211203.nc  2.980   4.500   ir
   SLSTR_S3D_S8_20211203.nc  9.050   12.65   ir
   SLSTR_S3D_S9_20211203.nc  10.00   14.00   ir

Nominal central wavenumber (microns and wavenumber):
    0.5550  18018.0180
    0.6590  15174.5068
    0.8650  11560.6936
    1.3750   7272.7272
    1.6090   6215.0403
    2.2500   4444.4444
    3.7400   2673.7967
   10.8500    921.6589
   12.0000    833.3333

append_coef: Following is taken from rtcoef_sentinel3_3_slstr-ir.H5:
    Last update, April 9th 2026

Download all SRFs: rtcoef_sentinel3_3_slstr_srf.tar.gz

Channel 01 Central wavenumber/wavelength: 18036.181 cm-1 / 0.554 microns Comment: 1, Resampled Sentinel-3D SLSTR unpolarised FPA response at 87 K SRF data: rtcoef_sentinel3_3_slstr_srf_ch01.txt SRF plot: rtcoef_sentinel3_3_slstr_srf_ch01.png

Channel 02 Central wavenumber/wavelength: 15199.525 cm-1 / 0.658 microns Comment: 2, Resampled Sentinel-3D SLSTR unpolarised FPA response at 87 K SRF data: rtcoef_sentinel3_3_slstr_srf_ch02.txt SRF plot: rtcoef_sentinel3_3_slstr_srf_ch02.png

Channel 03 Central wavenumber/wavelength: 11580.326 cm-1 / 0.864 microns Comment: 3, Resampled Sentinel-3D SLSTR unpolarised FPA response at 87 K SRF data: rtcoef_sentinel3_3_slstr_srf_ch03.txt SRF plot: rtcoef_sentinel3_3_slstr_srf_ch03.png

Channel 04 Central wavenumber/wavelength: 7266.748 cm-1 / 1.376 microns Comment: 4, Resampled Sentinel-3D SLSTR unpolarised FPA response at 87 K SRF data: rtcoef_sentinel3_3_slstr_srf_ch04.txt SRF plot: rtcoef_sentinel3_3_slstr_srf_ch04.png

Channel 05 Central wavenumber/wavelength: 6211.317 cm-1 / 1.610 microns Comment: 5, Resampled Sentinel-3D SLSTR unpolarised FPA response at 87 K SRF data: rtcoef_sentinel3_3_slstr_srf_ch05.txt SRF plot: rtcoef_sentinel3_3_slstr_srf_ch05.png

Channel 06 Central wavenumber/wavelength: 4456.179 cm-1 / 2.244 microns Comment: 6, Resampled Sentinel-3D SLSTR unpolarised FPA response at 87 K SRF data: rtcoef_sentinel3_3_slstr_srf_ch06.txt SRF plot: rtcoef_sentinel3_3_slstr_srf_ch06.png

Channel 07 Central wavenumber/wavelength: 2673.149 cm-1 / 3.741 microns Comment: 1, Resampled Sentinel-3D SLSTR unpolarised FPA response at 87 K SRF data: rtcoef_sentinel3_3_slstr_srf_ch07.txt SRF plot: rtcoef_sentinel3_3_slstr_srf_ch07.png

Channel 08 Central wavenumber/wavelength: 920.269 cm-1 / 10.866 microns Comment: 2, Resampled Sentinel-3D SLSTR unpolarised FPA response at 87 K SRF data: rtcoef_sentinel3_3_slstr_srf_ch08.txt SRF plot: rtcoef_sentinel3_3_slstr_srf_ch08.png

Channel 09 Central wavenumber/wavelength: 831.086 cm-1 / 12.032 microns Comment: 3, Resampled Sentinel-3D SLSTR unpolarised FPA response at 87 K SRF data: rtcoef_sentinel3_3_slstr_srf_ch09.txt SRF plot: rtcoef_sentinel3_3_slstr_srf_ch09.png