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whatnext21
Suspicious Observer explained this in the video uploaded for September 9th this morning.
This is the correct answer.
Phage
reply to post by abeverage
This is the correct answer.
Not really. Not exactly.
It was caused by the background subtraction algorithm, part of the automatic image processing system. In order to make details of the corona and CMEs more visible a "background mask" is applied to the images. The process is called background subtraction and uses a "stack" of past images to create a brightness map in order to remove bright areas that don't change over time.
The dark spot is where the planet Mercury was a couple of weeks ago. The spot will remain until the subtraction mask is updated.
edit on 9/9/2013 by Phage because: (no reason given)
Phage
reply to post by abeverage
This is the correct answer.
Not really. Not exactly.
It was caused by the background subtraction algorithm, part of the automatic image processing system. In order to make details of the corona and CMEs more visible a "background mask" is applied to the images. The process is called background subtraction and uses a "stack" of past images to create a brightness map in order to remove bright areas that don't change over time.
The dark spot is where the planet Mercury was a couple of weeks ago. The spot will remain until the subtraction mask is updated.
edit on 9/9/2013 by Phage because: (no reason given)