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.