On: Highest-resolution images ever captured of the sun...

[cornstalks]

It’s the original. Andrew McCarthy links to it from both his Twitter and Instagram accounts. It’s his own website.

[mikae1 → cornstalks]

Perhaps rr808 is referring to AI upscaling. As in, are these 139 proper megapixels or upreased to that size?

[cornstalks → mikae1]

It's made from over 90,000 individual images that have been stitched/combined together. I'm not the original photographer so I can't comment on his process, but I think it would be silly to use upscaling (AI or otherwise) when your starting data set likely contains multiple gigapixels.