An atmospheric phenomenon consisting of bands of light caused by charged solar particles following the earth's magnetic lines of force WordNet 3.0 & Open English WordNet

An aurora, also commonly known as the northern lights or southern lights, is a natural light display in Earth's sky, predominantly seen in high-latitude regions. Wikipedia

Natural light display in the sky on Earth seen predominantly in the high latitudes. Wikipedia Disambiguation

Natural light display that occurs in the sky, primarily at high latitudes Wikidata

A natural light display in the sky particularly in the Arctic regions. OmegaWiki

An atmospheric phenomenon created by charged particles from the sun striking the upper atmosphere, creating coloured lights in the sky. It is usually named australis or borealis based on whether it is in the Southern or Northern Hemisphere respectively. Wiktionary

Atmospheric phenomenon. Wiktionary (translation)