February 2000 anneal report for program 8410.

There was an anneal of the CCD on February 12, 2000, 30 days after the 
previous anneal on January 11 2000.  A homogeneous set of data was obtained 
from proposal 8410:  The Continuing Monthly Anneal Monitor.

For the most part, previous trends continue. The rate of hot pixel
growth, was within the average of previous months. The percentage of 
pixels annealed at the 10 e/s level increased substantially compared to 
any previous period.  In general the percentage of annealed pixels 
increased compared to the last previous two annealing periods but the 
number of hot pixels is still increasing.


1) The number of post anneal hot pixels continue increasing consistent
   with the previously determined long term trends.

   > 0.1 e/s: 14028 pixels on February 12
   > 1.0 e/s:  2861
   > 10. e/s:   304

   > 0.1 e/s: 13722 pixels on January 11
   > 1.0 e/s:  2842
   > 10. e/s:   318

   > 0.1 e/s: 12689 pixels on October 24
   > 1.0 e/s:  2591
   > 10. e/s:   265


2) The *raw* post-anneal dark countrate for this anneal is 0.0226 cts/pixel.
   This compares with 0.0218 cts/pixel in January, and 0.014820 cts/pixel in
   Feb 99.
   
3) The iterated median count rate (after iterating up to 30 times by
   eliminating pixels +/- 5*sigma) is 0.00497.
   
4) The creation rates for hot pixels over this period were within
   the normal range.
   
   > 0.1 e/s:  39.1 pixels/day in February 2000 
   > 1.0 e/s:   4.5
   > 10  e/s:   0.2

   > 0.1 e/s:  32.2 pixels/day in January 2000 (between Oct 99 and Jan 00)
   > 1.0 e/s:   7.4
   > 10  e/s:   1.2

   
   > 0.1 e/s:  53.8 pixels/day in October 99
   > 1.0 e/s:   6.1
   > 10  e/s:   0.2


   > 0.1 e/s:  66.8 pixels/day in January 98
   > 1.0 e/s:   7.2
   > 10  e/s:   0.5

5) The rate at which new hot pixels annealed out was within the normal 
   range of fluctuations for all the cases except for 10e/s which
   shows a considerable increase compared to any previous period. 

   > 0.1 e/s: 74.8% annealed away in the February 00 anneal.
   > 1.0 e/s: 86.4%
   > 10  e/s: 300.%

   > 0.1 e/s: 60.0% annealed away in the January 00 anneal.
   > 1.0 e/s: 57.7%
   > 10  e/s: 43.0%

   > 0.1 e/s: 58.5% annealed away in the October 99 anneal.
   > 1.0 e/s: 39.0
   > 10  e/s:-37.5%
   
   > 0.1 e/s: 80.3% annealed away in the September 99 anneal.
   > 1.0 e/s: 99.0
   > 10  e/s:-29.6%

   The usual plots are attached.