Topic:
Visible calibration update for month of October
Date/Time(UTC) Message Issued:
10 October 2007, 2223 UTC
Satellite(s) Involved:
NOAA-16, 17, 18, & MetOp-2/A
Instrument(s) Involved:
AVHRR
Product(s) Involved/Affected:
All Products
Date/Time(UTC) of Initial Implementation:
9 October 2007, Time 1709 UTC
Details/Specifics of Change:
The AVHRR visible calibration coefficients update for the month of October 2007 was completed at approximately 1709 UTC on
October 9 as planned. The following is a list of the first orbits processed following the update.
For NL/NM/NN,
NSS.HRPT.NL.D07282.S1623.E1635.B3632727.GC
NSS.GHRR.NL.D07282.S1436.E1623.B3632627.GC
NSS.GHRR.NM.D07282.S1403.E1548.B2750001.WI
NSS.LHRR.NM.D07282.S1038.E1050.B2749898.WI
NSS.HRPT.NM.D07282.S1732.E1745.B2750202.MO
NSS.HRPT.NN.D07282.S1649.E1702.B1230000.WI
NSS.GHRR.NN.D07282.S1517.E1649.B1229900.WI
NSS.LHRR.NN.D07282.S1632.E1643.B1229900.WI
For M2, the first orbit processed was:
NCS.FRAC.M2.D07282.S1419.E1559.B0504243.SV
The AVHRR visible calibration coefficients used for the month of October 2007 are provided below.
Metop-A/2
Ch_1_lo = 0.05236*count - 2.117, count<501.00
Ch_1_hi = 0.1547*count - 53.40, count>501.00
Ch_2_lo = 0.06288*count - 2.500, count<500.00
Ch_2_hi = 0.18677*count - 64.49, count>500.00
Ch_3_lo = 0.03077*count - 1.265, count<502.00
Ch_3_hi = 0.21374*count - 93.10, count>502.00
--------------------
NOAA-18 AVHRR
Ch_1_lo = 0.05307*count - 2.092, count<501.00
Ch_1_hi = 0.1582*count - 54.41, count>501.00
Ch_2_lo = 0.06159*count - 2.427, count<500.00
Ch_2_hi = 0.1848*count - 64.39, count>500.00
----------------------
NOAA-17 AVHRR
Ch_1_lo = 0.05571*count - 2.230, count<501.12
Ch_1_hi = 0.1636*count - 56.27, count>501.12
Ch_2_lo = 0.06725*count - 2.640, count<500.73
Ch_2_hi = 0.2002*count - 69.31, count>500.73
Ch_3_lo = 0.03241*count - 1.366, count<501.37
Ch_3_hi = 0.2272*count - 99.19, count>501.37
------------
NOAA-16 AVHRR
Ch_1_lo = 0.05587*count - 2.154, count<498.96
Ch_1_hi = 0.1631*count - 55.42, count>498.96
Ch_2_lo = 0.06067*count - 2.292, count<500.16
Ch_2_hi = 0.1787*count - 61.34, count>500.16
-------------------------------------
These coefficients are intended to be optimal on October 27, in the middle of the two scheduled updates. Results show that
NOAA-18 AVHRR channel 1 degrades at a very stable rate recently. There is no change of NOAA-18 AVHRR Ch1 calibration
coefficients over the past three months.
Contact Person(s) Name/Email/Phone Number for Questions:
Emily Harrod Emily.Harrod@noaa.gov 301-817-3882 operations support
Xiangqian Wu Xiangqian.Wu@noaa.gov 301-763-8136 x 138 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
http://www.oso.noaa.gov/goes/index.htm - SOCC geostationary satellite status