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*TOPIC*:   VISIBLE CALIBRATION UPDATE FOR MONTH OF MARCH 2026
*DATE/TIME ISSUED:*  MARCH 10 2026 2156Z*PRODUCT(S) OR DATA IMPACTED:*
 ALL PRODUCTS FROM CHANNELS 1, 2, AND 3A*DATE/TIME OF INITIAL IMPACT:*
 MARCH 10 2026 12:00 UTC*DATE/TIME OF EXPECTED END:*  UNTIL NEXT
MONTH`S COEFFICIENT UPDATE
*LENGTH OF OUTAGE:*   N/A*DETAILS/SPECIFICS OF CHANGE:*

ON 10 MARCH 2026 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 MARCH. THESE
COEFFICIENTS ARE INTENDED TO BE OPTIMAL ON MARCH 28, IN THE MIDDLE OF
THE TWO SCHEDULED UPDATES.

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METOP-B/1
# CH_1_LO = 0.05817*COUNT -  2.291, COUNT<500.62
# CH_1_HI =  0.1723*COUNT -  59.45, COUNT>500.62
# CH_2_LO = 0.06649*COUNT -  2.685, COUNT<503.00
# CH_2_HI =  0.1959*COUNT -  67.76, COUNT>503.00
# CH_3_LO = 0.03353*COUNT -  1.409, COUNT<500.85
# CH_3_HI =  0.2336*COUNT - 101.59, COUNT>500.85
--------------------------------------------------------------------------------------
METOP-C/3
# CH_1_LO = 0.05630*COUNT -  2.273, COUNT<498.68
# CH_1_HI =  0.1650*COUNT -  56.46, COUNT>498.68
# CH_2_LO = 0.06781*COUNT -  2.777, COUNT<500.01
# CH_2_HI =  0.1987*COUNT -  68.21, COUNT>500.01
# CH_3_LO = 0.03368*COUNT -  1.367, COUNT<498.72
# CH_3_HI =  0.2370*COUNT - 102.75, COUNT>498.72
-------------------------------------------------------------------------------------

FOR M3, M1 THE FIRST ORBITS PROCESSED WILL BE THE ONE RUNNING AFTER ORBIT:
NSS.HRPT.M1.D26069.S0852.E0901.B6992222.GCNSS.GHRR.M1.D26069.S0953.E1048.B6992223.SV
NSS.HRPT.M3.D26069.S0927.E0936.B3808080.GCNSS.GHRR.M3.D26069.S0943.E1123.B3808081.SV

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XIANGQIAN WU XIANGQIAN.WU@NOAA.GOV 
301-683-3601 INSTRUMENT SCIENTIST
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