Removal of Cosmic Ray Persistence From Science Data using the Post- SAA Darks

Details Removal of Cosmic Ray Persistence From Science Data using the Post- SAA Darks Removal of Cosmic Ray Persistence From Science Data using the Post- SAA Darks

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003nicm.rept...10b&link_type=abstract

Instrument Science Report NICMOS 2003-010, 45 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Nicmos

Scientific paper

Latent or “persistent” images of cosmic ray hits following HST transits of the South Atlantic Anomaly (SAA) can significantly increase the noise in subsequent NICMOS science images. By taking a pair of DARK exposures immediately following the exit of the SAA, a map of the persistent signal can be made and then used to subtract this signal from the impacted images in that orbit, thereby recovering much of the original S/N. We here describe an algorithm to do this.

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