Very cool. It's too bad that Chroma noise is apparently quite visible on other planets too.

It took me a while to understand what looks like a legend in the article's image. I don't think it is a legend, those are color swatches showing that if you subtract the aurora color from the left image and add it to the right, the resulting color is very similar ("Observed sky" on left is similar to "Observed sky + aurora" on right), strongly suggesting the presence of green aurora.