*Topic*:
AVHRR visible calibration coefficient update for September 2005
*Date/Time(UTC) Message Issued:*
1 September 2005, 1300 UTC
*Satellite(s) Involved:*
NOAA-16, 17, and 18
*Instrument(s) Involved:*
AVHRR
*Product(s) Involved/Affected:*
Channels 1, 2, 3a
*Date/Time(UTC) of Initial Implementation:*
13 September 2005, Time TBD UTC
*Details/Specifics of Change:*
The following update of the visible calibration coefficients are recommended for the September 13 update. Please note that this is the first update for NOAA-18 AVHRR. Due to the short history of this instrument, its calibration accuracy is probably less accurate but will improve over time. Also, NOAA-18 AVHRR Channel 3A has been deactivated, so there is no calibration update for this channel.
.
_NOAA-16 AVHRR_
Ch_1_lo = 0.05398*count - 2.081, count<498.96
Ch_1_hi = 0.1576*count - 53.55, count>498.96
Ch_2_lo = 0.05822*count - 2.199, count<500.16
Ch_2_hi = 0.1715*count - 58.87, count>500.16
_
NOAA-17 AVHRR_
Ch_1_lo = 0.05484*count - 2.195, count<501.12
Ch_1_hi = 0.1610*count - 55.39, count>501.12
Ch_2_lo = 0.06660*count - 2.615, count<500.73
Ch_2_hi = 0.1983*count - 68.64, count>500.73
Ch_3_lo = 0.03169*count - 1.336, count<501.37
Ch_3_hi = 0.2222*count - 97.00, count>501.37
_NOAA-18 AVHRR_
Ch_1_lo = 0.05045*count - 1.990, count<500.54
Ch_1_hi = 0.1504*count - 51.73, count>500.54
Ch_2_lo = 0.05485*count - 2.161, count<500.40
Ch_2_hi = 0.1646*count - 57.35, count>500.40
These coefficients are intended to be optimal on September 27, in the middle of the two scheduled updates.
*Contact Person(s) Name/Email/Phone Number for Questions:*
Xiangqian.Wu@noaa.gov/ 301-763-8136 ext. 138 physical scientist
Robert.Levin@noaa.gov/ 301-457-5247 ext. 124 ops support
*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/poesstatus/ - SOCC polar satellites status
http://www.oso.noaa.gov/daily-news/index.htm - SOCC morning reports
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*
* Emily D. Harrod
* NOAA/NESDIS/OSDPD/IPD
* Product Systems Branch
* Pre-Product Processing Group
* E/SP13, Federal Building #4, room 0318
* 5200 Auth Road
* Suitland, Maryland 20746-4304
* USA
* voice 301-457-5247 ext 117
* fax 301-457-5199
* email Emily.Harrod@noaa.gov
*
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