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You can even see the red perturbation at lower left. Nice. How did you take the picture?
Lower left
Are you sure?
My brain… farted.
This is kind of funny because it was in the lower left where I viewed the eclipse
Mirror, mirror.
I had a Canon T5i with a 600mm telephoto lens on a tracking mount, and used Magic Lantern (a firmware addon) to automatically take bracketed exposures at intervals of a few seconds. It let me actually enjoy the eclipse instead of trying to take photos during it. I actually got a much better photo of the solar prominences at my lowest exposure, though they are still overexposed somewhat. (Who knew they're that bright?)
What is that
It's a solar prominence. One of the big loopy bois on the Sun's surface.