this post was submitted on 06 Dec 2025
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So, my understanding of auroras is, the planet's magnetic field draws particles emitted by the sun toward the poles, and as those particles interact with the atmosphere they glow. So without a star and thus without solar wind, where do the aurora come from?
The theory seems to be captured radiation (electron) fields. Earth even has one. A stray planet and its halo of interstellar objects might have a very large and complex radiation belt system.