Dark lightning

{
  "id": "MLC-T-MET-004857",
  "term": "Dark lightning",
  "field": "Meteorology and atmospheric science",
  "definition": "A phenomenon involving bursts of high-energy gamma rays produced during thunderstorms, which are invisible to the human eye. These terrestrial gamma-ray flashes (TGFs) are thought to be generated by strong electric fields accelerating electrons to relativistic speeds, which then collide with air molecules. They are a form of high-energy atmospheric radiation.",
  "url": "https://mlchart.com/terminology/meteorology/dark-lightning/"
}