As usual, not nearly as extensive as it was during the "pre GOES-13" years.
http://www.ssd.noaa.gov/PS/SATS/GOES/EA ... -Rout.html
What is a GOES satellite eclipse?
http://www.srh.noaa.gov/ssd/html/goesfaqs.htm#Eclipse
What is a satellite eclipse period?
Since GOES is in a geosynchronous orbit, the sun will yearly traverse a +/- 23.5 degree angle perpendicular to the Earth's equator (GOES orbit plane). As a result, near the Vernal and Autumnal Equinoxes the Earth disk will periodically occult the sun, from a GOES perspective. Essentially, there are two eclipse seasons for each GOES spacecraft. Each eclipse season spans a 48-day period, symmetric around the equinox and the sun occultation lasts for a maximum of 72 minutes/day during the equinox. Each GOES spacecraft utilizes a solar array that converts sunlight into electricity in order to power the satellite. Each day during the eclipse season the sun is blocked by the Earth and sunlight is not available to the GOES solar array. Therefore, the energy needed to power the instruments is not available and the instruments are powered off. There is typically a 0-3 hour outage of imagery each day as GOES progresses through eclipse season. The maximum outage of 3 hours will occur at or near the equinox.
What is a solar intrusion? How does it affect GOES?
Solar intrusions are only a concern for GOES during the eclipse seasons. During a 48-day eclipse season as the sun moves from North-to-South (Autumnal Equinox) and South-to-North (Vernal Equinox), it will move closer to the Earth sensor chord, eventually entering the chord's field-of-view. In order to prevent the Earth sensor from scanning the sun, the chord containing the intrusion will be inhibited from scanning. Since solar intrusions only occur during eclipse season, there will be an image outage whenever GOES is performing single-chord operations due to a solar intrusion.
What are Keep Out Zones?
Keep-Out-Zone (KOZ) is another term related to eclipse season operations. The GOES imager and sounder instruments have temperature constraints that prevent them from scanning an area too close to the sun. If the GOES imager or sounder is allowed to scan an area near the sun, they could potentially overheat and become permanently damaged. Prior to and following each eclipse season as the sun is "close" to the Earth disk, image regions in the proximity of the sun will be deleted. Historically, the size of these regions, and hence Keep-Out-Zones for the GOES imager and sounder were a six degree radial region. Therefore, if the sun were predicted to be within a six-degree radius of the instrument field of view for a particular image, that image would not be commanded. More recent thermal analysis has been performed leading to a reduction in size of the KOZ, allowing images that were deleted in the past to be restored.