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Weekly Report on GOES-14 PLT Science Test

Weekly Report on GOES-14 PLT Science Test. NOAA / NESDIS / STAR X. Wu, G. Rancic, F. Yu, M. Grotenhuis December 14, 2009. Initial Post-Launch Calibration of GOES-14 Imager Visible Channel by Moon. Purpose: Verify pre-launch calibration Establish benchmark for trending Method:

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Weekly Report on GOES-14 PLT Science Test

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  1. Weekly Report onGOES-14 PLT Science Test NOAA / NESDIS / STAR X. Wu, G. Rancic, F. Yu, M. Grotenhuis December 14, 2009

  2. Initial Post-Launch Calibration ofGOES-14 Imager Visible Channel by Moon Purpose: • Verify pre-launch calibration • Establish benchmark for trending Method: • Vicarious calibration based on lunar observations. Data: • GOES-14 lunar observations on 08/10/2009. Analysis: • Lunar irradiances are calculated per Wu & Yu (2006). • ROLO predicted irradiances are obtained (courtesy of Dr. Tom Stone of USGS).

  3. GOES-14 observed and ROLO model predicted lunar irradiances and their ratios 3. The ratio is not constant, likely due to angular dependence of scan mirror reflectance that will be addressed separately. 2. The measured irradiance generally follows the predicted trend. 1. The predicted lunar irradiance decreases with the waning moon

  4. Preliminary results • The GOES-14 Imager visible channel appears ~1% brighter than predicted by the ROLO model. • Well within the uncertainty of Lunar based post-lunch calibration (>2%). • It has been observed for several AVHRR’s that measurements are initially brighter then expected. • Further evaluation by other vicarious calibration will follow.

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