NCAR is managed by the University Corporation for Atmospheric Research (UCAR), and receives substantial funding from the National Science Foundation (NSF).
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At V band, the emission from airglow is V=22 per square arc-second at a high-altitude observatory on a moonless night; in excellent seeing conditions, the image of a star will be about 0.7 arc-second across with an area of 0.4 square arc-second, and so the emission from airglow over the area of the image corresponds to about V=23.