Subject: MetOp-B/1, & MetOp-C/3 AVHRR, Monthly Visible Calibration Update, 9 September 2025 - Issued: 9 September 2025 1725Z
Topic: Visible calibration update for month of September 2025
Date/Time Issued: September 9, 2025 1725Z
Product(s) or Data Impacted: All products from channels 1, 2, and 3a
Date/Time of Initial Impact: September 9, 2025 1200Z
Date/Time of Expected End: Until Next Month's Coefficient Update
Length of Outage: N/A
Details/Specifics of Change:
On 9 September 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 September. These coefficients are intended to be optimal on September 27, in the middle of the two scheduled updates.
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Metop-B/1
# Ch_1_lo = 0.05813*count - 2.290, count<500.62
# Ch_1_hi = 0.1722*count - 59.41, count>500.62
# Ch_2_lo = 0.06618*count - 2.672, count<503.00
# Ch_2_hi = 0.1950*count - 67.44, count>503.00
# Ch_3_lo = 0.03347*count - 1.406, count<500.85
# Ch_3_hi = 0.2331*count - 101.39, count>500.85
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Metop-C/3
# Ch_1_lo = 0.05641*count - 2.277, count<498.68
# Ch_1_hi = 0.1653*count - 56.57, count>498.68
# Ch_2_lo = 0.06754*count - 2.766, count<500.01
# Ch_2_hi = 0.1979*count - 67.94, count>500.01
# Ch_3_lo = 0.03367*count - 1.366, count<498.72
# Ch_3_hi = 0.2369*count - 102.73, count>498.72
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For M3, M1 the first orbits processed will be the one running after orbit:
NSS.HRPT.M1.D25252.S0802.E0813.B6733636.GC
NSS.GHRR.M1.D25252.S1000.E1050.B6733737.MM
NSS.HRPT.M3.D25252.S0852.E0903.B3549494.GC
NSS.GHRR.M3.D25252.S0908.E1049.B3549495.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
Contact Information for Further Information: ESPC Operations at ESPCOperations@noaa.gov at 301-817-3880
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