UNCLASSIFIED
UNCLASSIFIED

KOZ is the Imager and Sounder Keep Out Zone, it occurs at certain times of the day (centered around Spacecraft midnight) when the instruments would be looking at the Sun when Scanning. The KOZ starts about 10 days before each eclipse season and end about 10 after the last eclipse. Major concern is rapid heating of the instrument mirrors which could compromise the instruments and the mission.

Single Chord is in reference to our Earth Sensor operations, which normally use two scans, one in the North and on in the South, for attitude control. Whenever the Moon or the Sun is about to enter the scan area, NOAA inhibits that scan so that the offending object does not corrupt our attitude control.
GOES Terminology