Topic:   Visible calibration update for month of September 2026 

Date/Time Issued:  September 8, 2026 1627Z

Product(s) or Data Impacted:  All products from channels 1, 2, and 3a

Date/Time of Initial Impact:  September 3, 2026 2009Z

Date/Time of Expected End:  Until Next Month's Coefficient Update 

Length of Outage:   N/A

Details/Specifics of Change:

On 3 September 2026 at approximately 20:09 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 September. These coefficients are intended to be optimal on September 26, in the middle of the two scheduled updates.

--------------------------------------------------------------------------------------
Metop-B/1
# Ch_1_lo = 0.05825*count -  2.294, count<500.62
# Ch_1_hi =  0.1726*count -  59.54, count>500.62
# Ch_2_lo = 0.06681*count -  2.698, count<503.00
# Ch_2_hi =  0.1968*count -  68.09, count>503.00
# Ch_3_lo = 0.03375*count -  1.418, count<500.85
# Ch_3_hi =  0.2351*count - 102.24, count>500.85
--------------------------------------------------------------------------------------
Metop-C/3
# Ch_1_lo = 0.05636*count -  2.276, count<498.68
# Ch_1_hi =  0.1651*count -  56.52, count>498.68
# Ch_2_lo = 0.06808*count -  2.788, count<500.01
# Ch_2_hi =  0.1995*count -  68.48, count>500.01
# Ch_3_lo = 0.03372*count -  1.368, count<498.72
# Ch_3_hi =  0.2372*count - 102.86, count>498.72
-------------------------------------------------------------------------------------

For M3, M1 the first orbits processed will be the one running after orbit:
NSS.GHRR.M1.D26246.S1816.E1907.B7244242.MM
NSS.GHRR.M3.D26246.S1658.E1839.B4059900.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 (where applicable):
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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