What are those dials on the NOAA-N satellite ?

Looking at the anomaly report describing the accident (at
http://www.spaceref.com/news/viewsr.html?pid=10299) I noticed that the
midsection of the satellite has many large "dials" on it (painted
yellow and white).
Anyone know what they are for?

(Henry Spencer) wrote in message ...

Those are thermal-control louvers: a propeller-shaped section of
insulation above a propeller-shaped area of thermal radiator, with a
bimetallic-strip arrangement so that when the satellite's interior gets
too hot, the insulation rotates to expose the radiator, cooling things
off.

Interesting.
Thanks for the answer.