G-region

{
  "id": "MLC-T-MET-010523",
  "term": "G-region",
  "field": "Meteorology and atmospheric science",
  "definition": "A historical designation for a hypothesized layer of ionization in the ionosphere situated above the F region, at altitudes exceeding 400 kilometers. Early radio observations suggested its transient existence, but it is not considered a permanent or distinct feature in modern models of the ionosphere. Unlike the D, E, and F regions, the G-region is not a standard part of ionospheric nomenclature today.",
  "url": "https://mlchart.com/terminology/meteorology/g-region/"
}