Correction: Needed to add additional info below
Topic: Visible calibration update for month of December 2025
Date/Time Issued: December 9, 2025 2045Z
Product(s) or Data Impacted: All products from channels 1, 2, and 3a
Date/Time of Initial Impact: December 9, 2025 1200Z
Date/Time of Expected End: Until Next Month's Coefficient Update
Length of Outage: N/A
Details/Specifics: On 9 December 2025 at approximately 12:00 UTC, the following update of the calibration coefficients was implemented in the level 1B processing for MetOp-B/1, and MetOp-C/3 for the month of December. These coefficients are intended to be optimal on December 27, in the middle of the two scheduled updates.
Metop-B/1
# Ch_1_lo = 0.05814*count - 2.290, count<500.62
# Ch_1_hi = 0.1722*count - 59.41, count>500.62
# Ch_2_lo = 0.06631*count - 2.678, count<503.00
# Ch_2_hi = 0.1953*count - 67.57, count>503.00
# Ch_3_lo = 0.03349*count - 1.407, count<500.85
# Ch_3_hi = 0.2333*count - 101.46, count>500.85
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Metop-C/3
# Ch_1_lo = 0.05634*count - 2.275, count<498.68
# Ch_1_hi = 0.1651*count - 56.50, count>498.68
# Ch_2_lo = 0.06765*count - 2.770, count<500.01
# Ch_2_hi = 0.1982*count - 68.05, count>500.01
# Ch_3_lo = 0.03365*count - 1.365, count<498.72
# Ch_3_hi = 0.2367*count - 102.65, count>498.72
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For M3, M1 the first orbits processed will be the one running after orbit:
NSS.HRPT.M1.D25343.S0828.E0838.B6862929.GC
NSS.GHRR.M1.D25343.S1024.E1116.B6863030.MM
NSS.HRPT.M3.D25343.S0910.E0920.B3678787.GC
NSS.GHRR.M3.D25343.S0926.E1106.B3678788.SV
Contact Person(s) Name/Email/Phone Number for Questions:
Dejiang.Han Dejiang.Han@noaa.gov <mailto:Dejiang.Han@noaa.gov> 301-817-4119 operations support
Xiangqian Wu Xiangqian.Wu@noaa.gov <mailto:Xiangqian.Wu@noaa.gov> 301-683-3601 instrument scientist
Web site(s) that contain other relevant information:
https://www.ospo.noaa.gov/operations/messages.html - All user notices
https://www.ospo.noaa.gov/operations/poes/status.html - SOCC polar satellite status
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