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Coronae glow on the tips of spruce needles, induced by charged metal plates in a laboratory. These weak electric discharges subtly singe the tips of leaves and needles, and new observations indicate they may occur ubiquitously across treetops under thunderstorms. Credit: William Brune

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Coronae glow on the tips of spruce needles, induced by charged metal plates in a laboratory. These weak electric discharges subtly singe the tips of leaves and needles, and new observations indicate they may occur ubiquitously across treetops under thunderstorms. Credit: William Brune
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Corey S Powell (coreyspowell@mastodon.social)'s status on Wednesday, 25-Feb-2026 03:12:09 JST Corey S Powell

During thunderstorms, electric discharges in the air cause trees to glow with an ultraviolet aura. You can't see it with your eyes, but researchers have finally managed to measure it & recreate it in the lab.
https://news.agu.org/press-release/thunderstorms-conjure-ghostly-coronae-in-treetops-observed-outdoors-for-the-first-time/ #science #nature

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