Scientists reported in March 2026 that what natural phenomenon causes tree tops to sparkle with electricity during thunderstorms?

The dazzling sight of treetops sparkling with electricity during thunderstorms is a fascinating natural phenomenon rooted in the powerful electrical forces at play within these intense weather systems. During a thunderstorm, immense electrical charges build up between the clouds and the ground. This strong electric field induces an opposite charge in the earth below, which then seeks the highest available points to discharge, often traveling up through trees. This concentration of electrical energy at the sharp tips of leaves and branches causes the surrounding air molecules to ionize, leading to a weak electrical discharge known as a corona. [cite: 1, 4, 5, 6, 8, 13]

This ethereal glow is a form of corona discharge, a phenomenon akin to the more widely known St. Elmo's Fire, which sailors have observed for centuries dancing on ship masts and aviators on airplane wings. [cite: 2, 9, 12, 14, 15] While scientists had long hypothesized that trees might also exhibit such electrical activity, direct observation in nature remained elusive until researchers reported their findings in early March 2026. [cite: 1, 2, 4, 6, 7] Using specialized ultraviolet cameras, they confirmed these "sparkles" are indeed occurring, though they are often too faint and emit too much UV light to be seen by the unaided human eye. [cite: 1, 2,