Administrative: MetOp-B/1, & MetOp-C/3 AVHRR, Monthly Visible Calibration Update, 10 February 2026 - Issued: 10 February 2026 1942 UTC

Topic: MetOp-B/1, & MetOp-C/3 AVHRR, Monthly Visible Calibration Update, 10 February 2026

Date/Time Issued: February 10 2026 1942 UTC

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

Date/Time of Initial Impact: February 10 2026 12:00 UTC

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

Length of Outage: N/A

Details/Specifics of Change:

On 10 February 2026 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 February. These coefficients are intended to be optimal on February 24, in the middle of the two scheduled updates.

--------------------------------------------------------------------------------------
Metop-B/1
# Ch_1_lo = 0.05819*count - 2.292, count<500.62
# Ch_1_hi = 0.1724*count - 59.47, count>500.62
# Ch_2_lo = 0.06645*count - 2.683, count<503.00
# Ch_2_hi = 0.1958*count - 67.72, count>503.00
# Ch_3_lo = 0.03352*count - 1.408, count<500.85
# Ch_3_hi = 0.2334*count - 101.54, count>500.85
--------------------------------------------------------------------------------------
Metop-C/3
# Ch_1_lo = 0.05630*count - 2.273, count<498.68
# Ch_1_hi = 0.1650*count - 56.46, count>498.68
# Ch_2_lo = 0.06779*count - 2.776, count<500.01
# Ch_2_hi = 0.1986*count - 68.19, count>500.01
# Ch_3_lo = 0.03367*count - 1.366, count<498.72
# Ch_3_hi = 0.2369*count - 102.70, count>498.72
-------------------------------------------------------------------------------------

For M3, M1 the first orbits processed will be the one running after orbit:
NSS.HRPT.M1.D26041.S0829.E0839.B6952424.GC
NSS.GHRR.M1.D26041.S1026.E1117.B6952525.MM

NSS.HRPT.M3.D26041.S0906.E0916.B3768282.GC
NSS.GHRR.M3.D26041.S0922.E1103.B3768283.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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