Administrative: NOAA-18, 19, Metop-B/1, Metop-A/2, Metop-C/3 AVHRR, Monthly Visible Calibration Update, 12 January 2021 - Issued: 12 January 2021 1635Z

Topic: Visible calibration update for month of January 2021

Date/Time Issued: January 12 2021 1635Z

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

Date/Time of Initial Impact: January 12 2021 12:00Z

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

Length of Outage: N/A

Details/Specifics of Change:

On 12 January 2021 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-A/2, MetOp-B/1, and MetOp-C/3 for the month of January. These coefficients are intended to be optimal on January 26, in the middle of the two scheduled updates.

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Metop-B/1

Ch_1_lo = 0.05709*count - 2.248, count<500.62

Ch_1_hi = 0.1691*count - 58.34, count>500.62

Ch_2_lo = 0.06420*count - 2.592, count<503.00

Ch_2_hi = 0.1891*count - 65.42, count>503.00

Ch_3_lo = 0.03283*count - 1.380, count<500.85

Ch_3_hi = 0.2287*count - 99.46, count>500.85

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Metop-A/2

Ch_1_lo = 0.05719*count - 2.312, count<501.01

Ch_1_hi = 0.1690*count - 58.32, count>501.01

Ch_2_lo = 0.07202*count - 2.863, count<500.42

Ch_2_hi = 0.2139*count - 73.87, count>500.42

Ch_3_lo = 0.03510*count - 1.442, count<501.94

Ch_3_hi = 0.2438*count - 106.20, count>501.94

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Metop-C/3

Ch_1_lo = 0.05474*count - 2.210, count<498.68

Ch_1_hi = 0.1604*count - 54.89, count>498.68

Ch_2_lo = 0.06348*count - 2.600, count<500.01

Ch_2_hi = 0.1860*count - 63.85, count>500.01

Ch_3_lo = 0.03241*count - 1.315, count<498.72

Ch_3_hi = 0.2280*count - 98.88, count>498.72

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NOAA-18 AVHRR

Ch_1_lo = 0.06340*count - 2.500, count<501.54

Ch_1_hi = 0.1890*count - 65.01, count>501.54

Ch_2_lo = 0.07495*count - 2.953, count<500.40

Ch_2_hi = 0.2249*count - 78.36, count>500.40

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NOAA-19 AVHRR

Ch_1_lo = 0.05543*count - 2.155, count<496.43

Ch_1_hi = 0.1635*count - 56.21, count>496.43

Ch_2_lo = 0.06588*count - 2.555, count<500.37

Ch_2_hi = 0.1962*count - 67.75, count>500.37

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The first 1b files produced with the updated CPIDS were:

NSS.HRPT.NN.D21012.S1255.E1304.B8065252.CF

NSS.GHRR.NN.D21012.S1145.E1340.B8065253.WI

NSS.HRPT.NP.D21012.S1225.E1240.B6149191.WI

NSS.GHRR.NP.D21012.S1032.E1225.B6149091.WI

For M3, M2 & M1 the first orbits processed will be the one running after orbit:

NSS.HRPT.M1.D21012.S0934.E0943.B4317171.GC

NSS.FRAC.M1.D21012.S1034.E1130.B4317172.SV

NSS.HRPT.M2.D21012.S0446.E0451.B7385555.MO

NSS.FRAC.M2.D21012.S0835.E1015.B7385758.SV

NSS.HRPT.M3.D21012.S0846.E0856.B1132828.GC

NSS.FRAC.M3.D21012.S0901.E1044.B1132829.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