Relative sunspot number

{
  "id": "MLC-T-MET-008512",
  "term": "Relative sunspot number",
  "field": "Meteorology and atmospheric science",
  "definition": "A measure of solar activity, calculated by summing the number of individual sunspots and ten times the number of sunspot groups observed on the Sun's surface. This index provides a quantitative assessment of the prevalence of sunspots, which are regions of intense magnetic activity. It has been recorded daily since 1818 and is often referred to as the Wolf number.",
  "url": "https://mlchart.com/terminology/meteorology/relative-sunspot-number/"
}