Administrative: MetOp-B/1, & MetOp-C/3 AVHRR, Monthly Visible Calibration Update, 11 August 2026 - Issued: 11 August 2026 1940 UTC

Topic: Visible calibration update for month of August 2026

Date/Time Issued: August 11 2026 1940 UTC

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

Date/Time of Initial Impact: August 11 2026 14:00 UTC

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

Length of Outage: N/A

Details/Specifics of Change:

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 301-817-4119 operations support
Xiangqian Wu 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

Contact Information for Further Information: ESPC Operations at ESPCOperations@noaa.gov at 301-817-3880

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