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原始链接: https://news.ycombinator.com/item?id=43987852
NASA observed visible-light auroras on Mars, a phenomenon noted in an article on nasa.gov. A user named globie highlighted that chroma noise is also present on other planets, pointing out the color swatches in the article's image, which suggested the presence of a green aurora. Another user, widforss, questioned how particles enter the night side atmosphere to cause auroras, given Mars' lack of a global magnetic field, a feature present on Earth. imoverclocked clarified that Mars does possess localized magnetic fields, remnants of a likely global magnetic field from its past. Sharlin suggested the observation likely occurred soon after sunset. Further comments questioned the comparatively poor image quality, with yieldcrv speculating it could be due to strong electromagnetic interference.
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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.
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