The Central Flare-like Feature appears and disappears intermittently, usually for a period of some months at a time.

The following periods clearly have the feature:

1. 2008-04-28 [P81] -- 2009-03-05 [P82]
2. 2010-12-08 [P86] -- 2011-04-05 [P87]
3. 2011-04-22 [P87] --
4. and others; since P87 the list has not been updated

At the centre of the array, i.e. where the four chips meet, there is a "flare-like" structure. It becomes evident in frames with DIT greater than about 30sec.

The presence of the feature is monitored in the 60 and 300 sec Daily Health Check [DHC] DARK frames.

The following images are montages of the central regions of the the 300 sec DHC DARK frames:

2008-04-27 -- 2008-09-27	2008-09-28 -- 2008-12-02	2008-12-03 -- 2009-02-16
2009-02-17 -- 2009-05-03	2009-05-04 -- 2009-07-05	2009-07-06 -- 2009-09-18
2009-09-19 -- 2009-12-08	2009-12-08 -- 2010-02-13	2010-02-14 -- 2010-04-25
2010-04-26 -- 2010-07-08	2010-07-09 -- 2010-09-16	2010-09-17 -- 2010-12-11
2010-12-12 -- 2011-02-22	2011-02-23 -- 2011-04-24