C figure

{
  "id": "MLC-T-MET-004102",
  "term": "C figure",
  "field": "Meteorology and atmospheric science",
  "definition": "A qualitative, single-digit index used to characterize the level of global geomagnetic activity for a given day. Observers at magnetic observatories assign a daily character of 0 (quiet), 1 (moderately disturbed), or 2 (highly disturbed) based on magnetogram readings. The global C figure is the arithmetic mean of the values reported by all participating observatories.",
  "see_also": [
    "C index"
  ],
  "url": "https://mlchart.com/terminology/meteorology/c-figure/"
}