Abstract
An effect has been observed in the channel 4 output of the NOAA-12 satellite which has not been observed from previous satellites in the NOAA series. Essentially, when sunglint is being observed by channels 1–3, and especially when channel 3 is saturated, the output of channel 4 becomes paralysed, It is believed that this problem has existed throughout the lifetime of this satellite, since the effect was also observed shortly after launch during July 1991.

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