The weak electric discharges may set off ultraviolet sparkles over large swaths of forest under storms, potentially impacting canopy health 23 February 2026 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 … Continue reading Thunderstorms conjure ghostly coronae in treetops, observed outdoors for the first time