Blackbody Calibration

DOC NOAA NESDIS


Blackbody Calibration



	Correction for GOES Imager Midnight Blackbody Calibration Error
	Description of Problem
	Calibration Correction
	Correction Algorithm
	Slide 5
	Scence Temperature Errors Predicted from Slope Errors vs Time
	Observed Scene Temperature Errors vs Time
	Observed vs Predicted Errors
	Slopes vs Time
	Uncorrected Slopes vs Time
	Corrected Slopes vs Times
	Parallel Test of Midnight Blackkbody Correction (MBCC)
	Slide 13
	Slide 14
	Conclusion

Conclusion

GOES Imager midnight blackbody calibration errors, caused by effects of solar heating in the Imager’s calibration cycle, artificially depress scene temperature observations by as much as 1 K in channel 2 (the 3.8 :m channel). The errors are smaller in the channels at longer wavelengths.
We have developed a correction algorithm, the Midnight Blackbody Calibration Correction (MBCC), and have tested it in a parallel run with GOES-10 data. The MBCC will produce significant (up to 1 K in channel 2) increases in scene temperature measurements over a period extending from 3-4 hours before local midnight to 1-2 hours after local midnight.
We plan to make the MBCC operational in the fall of 2003.
Details: http://www.oso.noaa.gov/goes/goes-calibration/errors.htm

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