Mount Wilson magnetic classifications

{
  "id": "MLC-T-MET-001765",
  "term": "Mount Wilson magnetic classifications",
  "field": "Meteorology and atmospheric science",
  "term_source": "Mount Wilson Magnetic Classifications",
  "definition": "In solar-terrestrial terms, a classification system for sunspots:\n\n• Alpha: Denotes a unipolar sunspot group.\n\n• Beta: A sunspot group having both positive and negative magnetic polarities, with a simple and distinct division between the polarities.\n\n• Beta-Gamma: A sunspot group that is bipolar but in which no continuous line can be drawn separating spots of opposite polarities.\n\n• Delta: A complex magnetic configuration of a solar sunspot group consisting of opposite polarity umbrae within the same penumbra.\n\n• Gamma: A complex active region in which the positive and negative polarities are so irregularly distributed as to prevent classification as a bipolar group.",
  "references": [
    "NWS Glossary"
  ],
  "url": "https://mlchart.com/terminology/meteorology/mount-wilson-magnetic-classifications/"
}