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Task Outcome Summary

Abstract

The 24 micron dark calibration image has been created, and is nominal. The mean dark current is 8.9 +/- 2.0 e/s, and the read noise is 42.5 +/- 7.5 e.

Analysis

All data were processed with DAT version 2.31 in order to derive calibrated images; DCEs (not including those with bias boosts) were coadded using mips_enhancer with the dark flag turned on. The read noise was calculated by running the IDL script get_rdnoise, which has been modified to reject cosmic rays from 24 micron SUR data.

Results

24 µm Data

Figure 1 shows the coadded dark calibration image. The illumination pattern and mean counts are nearly identical to darks obtained on the ground. The read noise was measured from the 35-DCE read noise data set, with a resulting value of 42.5 +/- 7.5 e, in the range of previous measurements.


Figure 1: 24 micron dark calibration image, a coaddition of 45 10-second exposures. The data range from ~ 1 to 3 DN/s.



Conclusions

The routine dark calibration and read noise are nominal.

Output and Deliverable Products

Dark calibration image, plus read noise measurement.

Actions Following Analysis

None