Modified refractivity

{
  "id": "MLC-T-MET-007360",
  "term": "Modified refractivity",
  "field": "Meteorology and atmospheric science",
  "definition": "A quantity derived from the atmospheric refractive index that incorporates the Earth's curvature, allowing for the analysis of radio wave propagation as if it were occurring in a flat Earth environment. It is calculated by adding a term proportional to height to the standard refractivity. This concept is particularly relevant for understanding phenomena like ducting, where radio waves are trapped and propagate over long distances.",
  "url": "https://mlchart.com/terminology/meteorology/modified-refractivity/"
}