Full Breakdown
Discovery of Ultraviolet Coronae on Trees During Thunderstorms
2/26/2026, 3:44:21 AM
Groundbreaking Observations of Electrical Discharges
In June 2024, a team of researchers from Pennsylvania State University made a significant discovery while storm-chasing in Pembroke, North Carolina. They documented the first-ever observation of coronae—brief, colorful electrical discharges—on the tips of tree leaves during thunderstorms. This phenomenon, theorized for nearly a century but never before seen in nature, was captured using a modified Toyota Sienna equipped with a weather station, electric field detector, and ultraviolet camera. The researchers recorded 41 instances of coronae on the leaves of a sweetgum tree over a 90-minute period during a thunderstorm.
Methodology and Findings
The researchers' approach involved outfitting their vehicle with specialized equipment to detect the faint ultraviolet emissions of coronae, which are typically invisible to the naked eye. The electrical discharges occur when the charge from a thunderstorm induces an opposite charge in the ground, causing electricity to travel to the highest points—typically the tips of leaves. The study revealed that these coronae could potentially illuminate tens to hundreds of leaves on treetops during thunderstorms, creating a visual effect akin to a light show, as described by lead author Patrick McFarland.
Implications for Tree Health
While the coronae are fascinating from a scientific perspective, they may also have implications for tree health. The electrical discharges can burn the tips of leaves, potentially damaging the protective cuticle that shields them from UV damage and dehydration. Although a single corona may not cause significant harm, repeated occurrences during multiple storms could lead to cumulative damage across the tree canopy. McFarland emphasized the need for further research to understand the long-term effects of these phenomena on trees and forests.
Criticism and Future Research Directions
Despite the excitement surrounding this discovery, some experts may question the broader ecological implications of coronae. The potential for electrical discharges to affect tree health raises concerns about how frequent thunderstorms might influence forest ecosystems. McFarland expressed a desire to collaborate with forest ecologists and botanists to explore these impacts further.
Verbatim Quotes
- “These things actually happen; we’ve seen them; we know they exist now,” — Patrick McFarland, Meteorologist, Pennsylvania State University
- “see this swath of glow on the top of every tree under the thunderstorm. It’d probably look like a pretty cool light show, as if thousands of UV-flashing fireflies descended on the treetops.” — Patrick McFarland, Meteorologist, Pennsylvania State University
Conclusion
The observation of coronae on trees during thunderstorms marks a significant advancement in our understanding of electrical phenomena in nature. As researchers continue to explore the implications of these findings, the study opens new avenues for investigating the relationship between thunderstorms and forest health.
