Whistler

{
  "id": "MLC-T-MET-010226",
  "term": "Whistler",
  "field": "Meteorology and atmospheric science",
  "definition": "A very low frequency (VLF) radio wave that propagates through the Earth's magnetosphere along geomagnetic field lines. These waves are generated by lightning discharges and are characterized by a descending tone, or 'whistle,' as higher frequencies arrive before lower frequencies. Whistlers provide information about the electron density and magnetic field structure of the magnetosphere.",
  "url": "https://mlchart.com/terminology/meteorology/whistler/"
}