I am puzzled by the « sun in visible light » picture: what is this # in the middle of it? (Physical phenomenom, or artifact from the pictures)
That's definitely an artifact from stitching multiple images. But I'm not sure why they would leave it that way since it's quite noticeable, but I guess there is always some debate on how much post-processing should they do on a scientific images and some people prefer closer to the raw capture even if it's not perfect.
Oh yeah, that is interesting. I would guess an artifact from the pictures. Maybe those are the lines where they joined the different pictures together into 1 picture. I would think they could do a better job than that though.
You can, somehow, view this # in the magnetic field map picture too. First I thought this was an artifact, but I highly doubt that they would leave such an amateur thing behind (and even amateurs don't get tricked into this). Besides from the visible picture and magnetic map, I don't seem to find any correlation with the other pictures.