WFPC2 Dark Current vs. Time

Details WFPC2 Dark Current vs. Time WFPC2 Dark Current vs. Time

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001wfpc.rept....5m&link_type=abstract

Instrument Science Report 2001-05, 13 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 2, Wfc2

Scientific paper

On-going measurements of the dark current in the WFPC2 detectors indicate that the average level of dark current has been slowly increasing over the instrument s lifetime. We have analyzed more recent dark current data, now covering the period from September 1994 to January 2001. This analysis shows that after late-1998, the dark current is increasing more slowly than expected and could possibly be leveling off temporarily. The STIS CCD dark current shows a similar effect. This behavior may be linked to the solar cycle, where the cosmic ray rate is reduced at solar maximum, causing the median dark current to be lower. If this hypothesis is correct, we expect the dark current to eventually continue increasing at its previous rate.

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