NUV Earth Flats

Physics

Scientific paper

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Hubble Space Telescope, Hst, Space Telescope Science Institute, Advanced Camera For Surveys, Acs

Scientific paper

While the bright Earth is a poor flat field source at optical wavelengths because of structure in the cloud cover, below ˜4000Å the Earth is a uniform source of diffuse light due to the high optical depth above the cloud layer. Sixteen supported modes of the ACS HRC camera lie in this wavelength regime and now have flats created from observations of the bright Earth. Unfortunately, the red leaks in F220W and F250W are so large that the outof-band light dominates, and the lab flats created with deuterium lamp illumination are superior to the observed earth flats for the 10 modes that include these two filters. A new dust mote appeared around 2002 Aug 13, so two flats for each of the 16 modes are required for HRC observations obtained before and after this date.

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