Index cycle

{
  "id": "MLC-T-MET-006490",
  "term": "Index cycle",
  "field": "Meteorology and atmospheric science",
  "definition": "A quasi-periodic fluctuation in the strength and pattern of the atmospheric circulation, particularly in the mid-latitudes. It involves transitions between high-index states, characterized by strong zonal flow, and low-index states, marked by weaker zonal flow and more meridional (north-south) patterns. The duration of an index cycle can range from weeks to months.",
  "url": "https://mlchart.com/terminology/meteorology/index-cycle/"
}