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Administrative: NOAA-18, 19, MetOp-B/1, & MetOp-C/3 AVHRR, Monthly Visible Calibration Update, 11 April 2023 - Issued: 12 April 2023 1309 UTC

Topic: Visible calibration update for month of April 2023

Date/Time Issued: April 12 2023 1309 UTC

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

Date/Time of Initial Impact: April 11 2023 12:00 UTC

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

Length of Outage: N/A

Details/Specifics of Change:

On 11 April 2023 at approximately 12:00 UTC, the following update of the calibration coefficients was implemented in the level 1B processing for NOAA-18, NOAA-19, MetOp-B/1, and MetOp-C/3 for the month of April. These coefficients are intended to be optimal on April 25, in the middle of the two scheduled updates.

--------------------------------------------------------------------------------------
Metop-B/1
# Ch_1_lo = 0.05782*count - 2.277, count<500.62
# Ch_1_hi = 0.1713*count - 59.09, count>500.62
# Ch_2_lo = 0.06490*count - 2.620, count<503.00
# Ch_2_hi = 0.1912*count - 66.14, count>503.00
# Ch_3_lo = 0.03315*count - 1.393, count<500.85
# Ch_3_hi = 0.2309*count - 100.43, count>500.85
--------------------------------------------------------------------------------------
Metop-C/3
# Ch_1_lo = 0.05595*count - 2.259, count<498.68
# Ch_1_hi = 0.1639*count - 56.11, count>498.68
# Ch_2_lo = 0.06498*count - 2.661, count<500.01
# Ch_2_hi = 0.1904*count - 65.36, count>500.01
# Ch_3_lo = 0.03326*count - 1.349, count<498.72
# Ch_3_hi = 0.2340*count - 101.45, count>498.72
--------------------------------------------------------------------------------------
NOAA-18 AVHRR
# Ch_1_lo = 0.06123*count - 2.414, count<501.54
# Ch_1_hi = 0.1826*count - 62.78, count>501.54
# Ch_2_lo = 0.07525*count - 2.965, count<500.40
# Ch_2_hi = 0.2258*count - 78.67, count>500.40
-------------------------------------------------------------------------------------
NOAA-19 AVHRR
# Ch_1_lo = 0.05646*count - 2.195, count<496.43
# Ch_1_hi = 0.1666*count - 57.25, count>496.43
# Ch_2_lo = 0.06819*count - 2.645, count<500.37
# Ch_2_hi = 0.2031*count - 70.12, count>500.37
--------------------------------------------------------------------------------------

The first 1b files produced with the updated CPIDS were:
NSS.HRPT.NN.D23101.S1418.E1424.B9221717.WI
NSS.GHRR.NN.D23101.S1216.E1411.B9221617.WI

NSS.HRPT.NP.D23101.S1326.E1340.B7305454.WI
NSS.GHRR.NP.D23101.S1124.E1319.B7305354.WI

For M3, M1 the first orbits processed will be the one running after orbit:
NSS.HRPT.M1.D23101.S0848.E0858.B5480606.GC
NSS.GHRR.M1.D23101.S1045.E1135.B5480707.MM

NSS.HRPT.M3.D23101.S0941.E0950.B2296464.GC
NSS.GHRR.M3.D23101.S0815.E0957.B2296364.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):
http://www.osdpd.noaa.gov/PSB/PPP/PPP.html - History of level 1B notices
http://www.ssd.noaa.gov/PS/SATS/messages.html - All user notices
http://www.oso.noaa.gov/poes/index.htm - SOCC polar satellite status

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

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ppp@nesdis.noaa.gov

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