Polar mesospheric summer echoes

{
  "id": "MLC-T-MET-008028",
  "term": "Polar mesospheric summer echoes",
  "field": "Meteorology and atmospheric science",
  "definition": "An atmospheric phenomenon observed by radar in the mesosphere during summer months at high latitudes. These echoes are caused by strong scattering from small-scale irregularities in electron density, which are thought to be related to the presence of ice particles. They typically occur at altitudes between 80 and 90 kilometers and are a key indicator of mesospheric conditions.",
  "abbreviation": "PMSE",
  "url": "https://mlchart.com/terminology/meteorology/polar-mesospheric-summer-echoes/"
}