Topic:   Visible calibration update for month of April 2025

 

Date/Time Issued:  April 8 2025 2136 UTC

 

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

 

Date/Time of Initial Impact:  April 8 2025 12:00 UTC

 

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

 

Length of Outage:   N/A

 

Details/Specifics: On 8 April 2025 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 26, in the middle of the two scheduled updates.

 

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

Metop-B/1

# Ch_1_lo = 0.05810*count -  2.288, count<500.62

# Ch_1_hi =  0.1721*count -  59.38, count>500.62

# Ch_2_lo = 0.06602*count -  2.666, count<503.00

# Ch_2_hi =  0.1945*count -  67.28, count>503.00

# Ch_3_lo = 0.03343*count -  1.405, count<500.85

# Ch_3_hi =  0.2328*count - 101.26, count>500.85

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

Metop-C/3

# Ch_1_lo = 0.05645*count -  2.279, count<498.68

# Ch_1_hi =  0.1654*count -  56.61, count>498.68

# Ch_2_lo = 0.06759*count -  2.768, count<500.01

# Ch_2_hi =  0.1980*count -  67.98, 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

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

NOAA-18 AVHRR

# Ch_1_lo = 0.06120*count -  2.413, count<501.54

# Ch_1_hi =  0.1825*count -  62.75, count>501.54

# Ch_2_lo = 0.07597*count -  2.993, count<500.40

# Ch_2_hi =  0.2279*count -  79.42, count>500.40

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

NOAA-19 AVHRR

# Ch_1_lo = 0.05643*count -  2.194, count<496.43

# Ch_1_hi =  0.1665*count -  57.22, count>496.43

# Ch_2_lo = 0.06777*count -  2.628, count<500.37

# Ch_2_hi =  0.2019*count -  69.69, count>500.37

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

 

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

NSS.HRPT.NN.D25098.S1146.E1150.B0249999.SV

NSS.GHRR.NN.D25098.S0959.E1150.B0249899.SV

 

NSS.HRPT.NP.D25098.S1140.E1144.B8333434.SV

NSS.GHRR.NP.D25098.S0953.E1144.B8333334.SV

 

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

NSS.HRPT.M1.D25098.S0928.E0936.B6514949.GC

NSS.GHRR.M1.D25098.S1028.E1124.B6514950.SV

 

NSS.HRPT.M3.D25098.S0838.E0848.B3330606.GC

NSS.GHRR.M3.D25098.S0530.E0713.B3330405.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

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