Why does the border of the sun look so poorly antialiased in all of these? Are they doing some sort of postprocessing that would cause that?

Just the guts of the simulation showing through at higher resolutions.

I assumed it was the result of the "bubbling" that they describe in the video that also accounts for the grainy appearance of the surface; presumably the bubbling would be visible like this side on?

I’d print and hang the ultraviolet one on my wall if it wasn't for the very rough edges. Dang.

you can probably use any AI generator to fix it in the same color

You haven't developed a good taste in scientific art then. The jagged mosaic edges are, IMHO, the flourish of authenticity that completes it.

Rough edges—that's like rejecting a van Gogh painting because it has too much paint and looks lumpy[0]. Art is lumpy. The ones that are perfectly flat are inkjet prints.

[0] https://en.wikipedia.org/wiki/Impasto

Btw any tip for a good printing service available in Europe if I were to mega-print this?

Here's a version with hard edges softened a bit, although my effort is a 5 min job, it scrubs up okay. Also this is a blend of visible and ultraviolet. Good old imgur, they allow massive jpeg uploads without needing to sign up or log in!

https://imgur.com/a/vRGav2d

Here is the link to the full directory contents of uploaded images; including hi-res ~99MB versions.

https://eopro.esa.int/wp-content/uploads/2024/10/

Would be nice to have it in an HDR format if they have something beyond 8-bit in the raw data

Downloading the big ones is so slow even over a semi-decent connection, it feels like getting certain lowres images in 1995 over a modem :-) What a blast from the past!

https://eopro.esa.int/wp-content/uploads/2024/10/PHI_Visible...

Thanks for the hi-res images.

I couldn't resist blending the visible with ultraviolet in Photoshop, here's the result: https://imgur.com/a/vRGav2d

I did a quick clean up of the hard edges, but didn't want to push pixels too much.

While that is nice, I would love to see the combined image with the uv image colour shifted to blue or magenta. Almost as if we could see UV with our eyes

That might be cool, although those colours might clash with the orange sun. You should try it.

I did another image, this time I took a section near the edge, flattened it to make an horizon, changed colours & contrast until it resembles ocean waves. https://imgur.com/a/5wnJUiN