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

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

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

4. 4 Preliminary results The GOES-14 Imager visible channel appears ~1% brighter than predicted by the ROLO model. 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%). 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. It has been observed for several AVHRR’s that measurements are initially brighter then expected. Further evaluation by other vicarious calibration will follow. Further evaluation by other vicarious calibration will follow.