Scattered Light from the Earth Limb Measured with the STIS CCD

Physics

Scientific paper

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Hubble Space Telescope, Hst, Space Telescope Science Institute, Stis, Space Telescope Imaging Spectrograph

Scientific paper

We describe a recent program to measure the amount of scattered light near the Earth limb with the STIS CCD detector. Scattered Earth light is only marginally detected as close as 11° from the dark limb, but it is easily detected within 25° from the bright limb, and it can vary in brightness by nearly a factor of two on timescales as short as two minutes. The measured background level is essentially constant between 25° and 37° from the bright Earth limb, but it increases exponentially and uniformly over the entire detector within 25° of the bright limb; within 20° the light distribution on the images becomes spatially non-uniform at a level exceeding 1-s deviations from the read noise.

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