GOES-13 Scan Mirror E-W Emissivity Correction The four GOES-13 Imager infrared (IR) bands are characterized across the full scan width for space-view measurements: – Measurements before characterization have GOES-12 coefficients applied to GOES-13 data – Measurements after characterization have new GOES-13 coefficients applied. GOES-13 band-4 (10.7 μm) seems to be affected the most. Don Hillger, NOAA/NESDIS/StAR/RAMMB

Before: With GOES-12 coefficients applied. Note the slight downturn in the yellow trace for Band-4 (10.7 μm). The GOES-12 coefficients are a pretty for most bands. Band-2 Band-3 Band-6 Band-4

After: With GOES-13 coefficients applied. Note the similar values at both ends of the scan for all bands. Center of scan touches top of earth. Band-2 Band-3 Band-4 Band-6

Before: Band-4 (10.7 μm) with GOES-12 coefficients applied. Note the downturn in the trace across the scan. Band-4 (10.7 um)

After: Band-4 (10.7 μm) with GOES-13 coefficients applied. Note the similar values at both ends of the scan for all bands. Center of scan touches top of earth. Band-4 (10.7 um)