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ISOCAM LW detector CCD glitches 1995-1997

The diagrams presented here depict the long-term glitch statistics of the ISOCAM LW CCD, and have been produced by J. Sorensen at ESTEC based on the CGLITCH data set provided to us by Richard Saxton in Vilspa. The upper diagram shows the mean number of CCD pixels affected per 10 minute time period as a function of ISO revolution (x-axis), and orbital position (y-axis), whereas the lower plot represents the corresponding 10-minute mean intensity of the pixels affected. Both diagrams span a period of two years.

It can be seen that at least visually there is very little variation in either of these diagrams as a function of time. The central wide dark band corresponds to the perigee passage when no scientific observations are made, whereas the two narrow bright bands immediately before and after the no-observation period are probably instrumental artefacts. The third narrow band at the bottom of the figures represents the hand-over between two tracking stations.

Figure 1. The mean number of ISOCAM CCD pixels affected in 10-minute periods from November 1995 until October 1997.

Figure 2. The mean intensity of ISOCAM CCD pixels affected in 10-minute periods from November 1995 until October 1997.

For questions, comments, and further information, please contact P. Nieminen at ESA/ESTEC.

 

 

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