Radio duct

{
  "id": "MLC-T-MET-008323",
  "term": "Radio duct",
  "field": "Meteorology and atmospheric science",
  "definition": "A layer in the atmosphere where the vertical gradient of the radio refractive index is such that radio waves are trapped and guided along the layer. This phenomenon, known as radio ducting, allows radio signals to propagate much farther than their normal line-of-sight range. Ducts are often associated with temperature inversions and strong humidity gradients.",
  "synonyms": [
    "atmospheric duct"
  ],
  "see_also": [
    "anomalous propagation",
    "skip effect"
  ],
  "url": "https://mlchart.com/terminology/meteorology/radio-duct/"
}