From: Frank Masci <fmasci@ipac.caltech.edu>
Subject: prelim bad-pixel animations
Date: December 9, 2013 at 11:04:17 AM PST
To: neowiser@jpl.nasa.gov

Hi All,

From the good SUTR frames acquired last week, the L0 products were normalized then stacked to make trimmed average and standard-deviation maps. I also did the same for a quasi-representative set acquired at the end of post-cryo in the main mission.

Stack-trimmed averages:
https://staffwiki.ipac.caltech.edu/@api/deki/files/1404/=w1stackmov.gif
https://staffwiki.ipac.caltech.edu/@api/deki/files/1405/=w2stackmov.gif

Stack-StdDevs:
https://staffwiki.ipac.caltech.edu/@api/deki/files/1406/=w1sigmov.gif
https://staffwiki.ipac.caltech.edu/@api/deki/files/1407/=w2sigmov.gif

Here's an initial assessment:

* Static bad pixel count (primarily with a high dark signal) relative to late post-cryo: W1 increased by ~18%; W2 increased by ~23%.

* The relative increase in noisy pixels alone is more difficult to quantify, but it's no more than the above static numbers. Of course, they're correlated to some degree.

Thankfully, our preliminary instrumental calibration tests show that the static culprits can be nicely subtracted out, but at the expense of an increase in the overall noise. I don't have hard numbers for the latter yet.

Regards, Frank