Topic:   Visible calibration update for month of October 2025

Date/Time Issued:  October 14 2025 1621 UTC

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

Date/Time of Initial Impact:  October 14 2025 12:00 UTC

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

Length of Outage:   N/A

Details/Specifics:  
On 14 October 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 October. These coefficients are intended to be optimal on October 28, in the middle of the two scheduled updates.

--------------------------------------------------------------------------------------
Metop-B/1
# Ch_1_lo = 0.05815*count -  2.290, count<500.62
# Ch_1_hi =  0.1723*count -  59.43, count>500.62
# Ch_2_lo = 0.06623*count -  2.674, count<503.00
# Ch_2_hi =  0.1951*count -  67.50, count>503.00
# Ch_3_lo = 0.03349*count -  1.407, count<500.85
# Ch_3_hi =  0.2332*count - 101.45, count>500.85
--------------------------------------------------------------------------------------
Metop-C/3
# Ch_1_lo = 0.05639*count -  2.276, count<498.68
# Ch_1_hi =  0.1652*count -  56.55, count>498.68
# Ch_2_lo = 0.06763*count -  2.770, count<500.01
# Ch_2_hi =  0.1981*count -  68.02, count>500.01
# Ch_3_lo = 0.03367*count -  1.366, count<498.72
# Ch_3_hi =  0.2369*count - 102.71, count>498.72

-------------------------------------------------------------------------------------

For M3, M1 the first orbits processed will be the one running after orbit:

NSS.HRPT.M1.D25287.S0923.E0931.B6783434.GC
NSS.GHRR.M1.D25287.S1023.E1118.B6783435.SV

NSS.HRPT.M3.D25287.S0827.E0839.B3599191.GC
NSS.GHRR.M3.D25287.S0844.E1025.B3599192.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

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

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