Topic: Visible calibration update for month of August 2026 

Date/Time Issued:  August 11, 2026 1940Z

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

Date/Time of Initial Impact:  August 11 2026 1400Z

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

Length of Outage: N/A

Details/Specifics:  On 11 August 2026 at approximately 14:00 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 August. These coefficients are intended to be optimal on August 25, 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 -  59.53, count>500.62
# Ch_2_lo = 0.06678*count -  2.697, count<503.00
# Ch_2_hi =  0.1967*count -  68.06, count>503.00
# Ch_3_lo = 0.03375*count -  1.418, count<500.85
# Ch_3_hi =  0.2351*count - 102.26, count>500.85
--------------------------------------------------------------------------------------
Metop-C/3
# Ch_1_lo = 0.05636*count -  2.276, count<498.68
# Ch_1_hi =  0.1652*count -  56.52, count>498.68
# Ch_2_lo = 0.06804*count -  2.786, count<500.01
# Ch_2_hi =  0.1993*count -  68.43, count>500.01
# Ch_3_lo = 0.03371*count -  1.368, count<498.72
# Ch_3_hi =  0.2372*count - 102.85, count>498.72
-------------------------------------------------------------------------------------

For M3, M1 the first orbits processed will be the one running after orbit:
NSS.HRPT.M1.D26223.S1258.E1309.B7211212.WI
NSS.GHRR.M1.D26223.S1156.E1251.B7211112.SV
NSS.HRPT.M3.D26223.S1322.E1333.B4027070.WI
NSS.GHRR.M3.D26223.S1134.E1315.B4026970.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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