OK kids...here's my semi-annual bit-o-bad news. Save your rotten tomatoes, please.
The bulletin...
http://www.ssd.noaa.gov/PS/SATS/SPBULL/ ... 734.01.txt
The schedule...
http://www.ssd.noaa.gov/PS/SATS/GOES/EA ... -Rout.html
GOES Fall 2008 eclipse schedule
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AJC3
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GOES Fall 2008 eclipse schedule
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JonathanBelles
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AJC3
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Re:
Chacor wrote:Someone remind me...what use are the sat eclipses?
Essentially, the satellite is powered down since the earth is blocking the sun's light from providing solar power to the satellite's solar array. There are also "keep out zones" around the eclipse period where the satellite is also powered off because that the sun's rays would otherwise intrude into the imager to cause some sort of overheating problem with the instruments.
http://www.srh.noaa.gov/ssd/html/goesfaqs.htm
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.
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