Sunspot Group Classification

{
  "id": "MLC-T-MET-002701",
  "term": "Sunspot Group Classification",
  "field": "Meteorology and atmospheric science",
  "definition": "• A: A small single unipolar sunspot or very small group of spots without penumbra.\n\n• B: Bipolar sunspot group with no penumbra.\n\n• C: An elongated bipolar sunspot group. One sunspot must have penumbra.\n\n• D: An elongated bipolar sunspot group with penumbra on both ends of the group.\n\n• E: An elongated bipolar sunspot group with penumbra on both ends. Longitudinal extent of penumbra exceeds 10 deg. but not 15 deg.\n\n• F: An elongated bipolar sunspot group with penumbra on both ends. Longitudinal extent of penumbra exceeds 15 deg.\n\n• H: A unipolar sunspot group with penumbra.",
  "references": [
    "NWS Glossary"
  ],
  "url": "https://mlchart.com/terminology/meteorology/sunspot-group-classification/"
}