CARA Science: IR Site Characterizartion
In the near-IR, the sky brightness has been shown to
be between 20 and 100 times lower than at temperate sites
(Phillips et al. 1999;
Ashley et al. 1996;
et al. 1996). Exceptionally low near-IR backgrounds at the
South Pole are not infrequent (Phillips
et al. 1999).
At 11 microns the summertime sky brightness at the
South Pole is an order of magnitude lower than at a typical
temperate observatory in winter, and much more stable
(Smith & Harper 1997).
Between 20 and 30 microns the wintertime optical depth is
typically 0.25 with excellent stability of 0.2% variability
over the 14 minute periods of observation.
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