Compensating for the Effects of hot Pixels in the Sunward Camera of SMEI

Details Compensating for the Effects of hot Pixels in the Sunward Camera of SMEI Compensating for the Effects of hot Pixels in the Sunward Camera of SMEI

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh21a0397e&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH21A-0397

Physics

7513 Coronal Mass Ejections, 7594 Instruments And Techniques

Scientific paper

The sunward camera of SMEI (Camera 3) is operating at a much higher temperature than its designed range. As a consequence of this there are many hot or flipper pixels in that camera which if not excluded or corrected would make the data from that camera unusable. To detect the hot pixels weekly calibrations are performed. The first line of defence against the hot pixels is the use of regular anneals which remove some of the defects causing the pixel flipping. However even with this annealing, an increasing fraction of the CCD pixels are hot. By mid-2004, the fraction of hot pixels was close to 25%, which means that when the pixels are binned about half the bins are affected. Because the flipping pixels are inherently unpredictable, it is be st to eliminate these, but those which are stably hot can be used if a temperature-dependant dark charge is used for each pixel.

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