Topic: MetOp-B/1, & MetOp-C/3 AVHRR, Monthly Visible Calibration Update, Scheduled August 12, 2025
Date/Time Issued: August 12, 2025 1750Z
Product(s) or Data Impacted: All products from channels 1, 2, and 3a
Date/Time of Initial Impact: August 12, 2025 12:00 UTC
Date/Time of Expected End: Until Next Month's Coefficient Update
Length of Outage: N/A
Details/Specifics:
On 12 August 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 August. These coefficients are intended to be optimal on August 26, in the middle of the two scheduled updates.
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Metop-B/1
# Ch_1_lo = 0.05812*count - 2.289, count<500.62
# Ch_1_hi = 0.1722*count - 59.40, count>500.62
# Ch_2_lo = 0.06612*count - 2.670, count<503.00
# Ch_2_hi = 0.1948*count - 67.38, count>503.00
# Ch_3_lo = 0.03344*count - 1.405, count<500.85
# Ch_3_hi = 0.2329*count - 101.31, count>500.85
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Metop-C/3
# Ch_1_lo = 0.05643*count - 2.278, count<498.68
# Ch_1_hi = 0.1653*count - 56.59, count>498.68
# Ch_2_lo = 0.06746*count - 2.763, count<500.01
# Ch_2_hi = 0.1977*count - 67.86, count>500.01
# Ch_3_lo = 0.03366*count - 1.366, count<498.72
# Ch_3_hi = 0.2368*count - 102.69, count>498.72
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For M3, M1 the first orbits processed will be the one running after orbit:
NSS.HRPT.M1.D25224.S0923.E0932.B6693939.GC
NSS.GHRR.M1.D25224.S1023.E1119.B6693940.SV
NSS.HRPT.M3.D25224.S0830.E0842.B3509696.GC
NSS.GHRR.M3.D25224.S0847.E1029.B3509697.SV
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 for Further Information:
Dejiang.Han Dejiang.Han@noaa.gov 301-817-4119 Operations Support
Xiangqian Wu Xiangqian.Wu@noaa.gov 301-683-3601 Instrument Scientist
ESPC Operations at ESPCOperations@noaa.gov at 301-817-3880
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