Cosmic Rays on NICMOS: Results from On-Orbit Data

Details Cosmic Rays on NICMOS: Results from On-Orbit Data Cosmic Rays on NICMOS: Results from On-Orbit Data

Jun 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997nicm.rept...22c&link_type=abstract

Instrument Science Report NICMOS-022, 6 pages

Computer Science

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

Scientific paper

NICMOS dark frames obtained during SMOV are used to derive the sensitivity of the detectors to cosmic ray hits. The number of cosmic ray events (5 s detections) is about 1.2-1.6 events/Camera/sec, comparable to the WFPC2 detection rate for the same detector’s area. The mean size of the 5 s cosmic ray hits is 1.65 to 2 pixels, similar to the value measured during the NICMOS SLTV experiments (see ISR NICMOS-019). The number of pixels affected by cosmic ray hits is between 2 and 3 pix/Camera/sec. This value depends on the position of the telescope relative to the South Atlantic Anomaly (SAA), and variations up to 60% in the rate of affected pixels have been observed between different dark frames during the same orbit. Information in the affected pixels can be partially recovered with the use of the MULTIACCUM readout mode.

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