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Hubble Space Telescope
COS Monitors

General Performance

Cumulative Image

COS Cumulative Image (CCI) files are analyzed on approximately a weekly basis. Modal gain maps for each period are collated to monitor the progress of each pixel(superpixel) with time. Pixels that drop below a threshold value are flagged and collected into a gain sag table reference file (gsagtab), which is then used in CalCOS processing to filter out bad regions.

Current Gainmaps

These gainmaps are at the current operational HV for each segment, showing the most recent CCI data.

Cumulative Gainmaps

These gainmaps show the cumulative gainmaps for each HV setting and detector segment.