UPDATE: A new set of data has been published. But there is still a value in the missing column. 0.01597 million sq km.
The updated graph:
I have been a bit worried about the deep deep dive in Antarctica Sea Ice Extent.
It appears to be a processing or sensor error. As of today the NSIDC data confirms it.
The table of data on the right of this image is the last 5 days. The data does have a value in the Missing column – 1.97873 million sq km.
The Missing column is usually empty. Sometimes it takes NSIDC a couple of days to sort things out.
sunshine hours 
Yes. When I see data seesawing like this, I get suspicious.
I think that the processing error goes back a couple of more days. What do you think?
Not sure. It isn’t unusual to have a large drop. The lack of recovery from the drop was unusual.
Of course Cryosphere today still has not corrected. They may not this, time we shall see.
CT not corrected yet http://arctic.atmos.uiuc.edu/cryosphere/IMAGES/seaice.recent.antarctic.png