← Agent Data Hub · Search endpoints · /llms.txt

Sunspot Number & Solar Flux History since 1749 (NOAA)

Monthly mean sunspot number since 1749 and 10.7 cm solar radio flux, resampled to years if needed — the full solar-cycle record.

Call it (no API key)

GET https://api.agentdatahub.de/api/v1/call/space-solar-cycle-history?start=1990&resample=A&compact=1

Full metadata: without compact=1 · Markdown: format=llm · Only some fields: add &fields=a,b.c · MCP: tool call_api with {"apiId":"space-solar-cycle-history"}

Parameters

Example response (live, compact)

{
  "apiId": "space-solar-cycle-history",
  "data_freshness": "live",
  "data": {
    "unit": "sunspot number / solar flux units",
    "resample": "A",
    "series": [
      {
        "period": "1990",
        "sunspot_number": 191.4,
        "f107": null
      },
      {
        "period": "1991",
        "sunspot_number": 203.4,
        "f107": null
      },
      {
        "period": "1992",
        "sunspot_number": 133.3,
        "f107": null
      },
      {
        "period": "1993",
        "sunspot_number": 76.3,
        "f107": null
      },
      {
        "period": "1994",
        "sunspot_number": 44.9,
        "f107": null
      },
      {
        "period": "1995",
        "sunspot_number": 25.2,
        "f107": null
      },
      {
        "period": "1996",
        "sunspot_number": 11.6,
        "f107": null
      },
      {
        "period": "1997",
        "sunspot_number": 28.9,
        "f107": null
      },
      {
        "period": "1998",
        "sunspot_number": 88,
        "f107": null
      },
      {
        "period": "1999",
        "sunspot_number": 136.2,
        "f107": null
      },
      {
        "period": "2000",
        "sunspot_number": 173.8,
        "f107": null
      },
      {
        "period": "2001",
        "sunspot_number": 170.3,
        "f107": null
      },
      {
        "period": "2002",
        "sunspot_number": 163.6,
        "f107": null
      },
      {
        "period": "2003",
        "sunspot_number": 99,
        "f107": null
      },
      {
        "period": "2004",
        "sunspot_number": 65.3,
        "f107": 116.4
      },
      {
        "period": "2005",
        "sunspot_number": 45.7,
        "f107": 94.5
      },
      {
        "period": "2006",
        "sunspot_number": 24.6,
        "f107": 80.6
      },
      {
        "period": "2007",
        "sunspot_number": 12.6,
        "f107": 73.1
      },
      {
        "period": "2008",
        "sunspot_number": 4.2,
        "f107": 68.9
      },
      {
        "period": "2009",
        "sunspot_number": 4.8,
        "f107": 70.5
      },
      {
        "period": "2010",
        "sunspot_number": 24.9,
        "f107": 79.9
      },
      {
        "period": "2011",
        "sunspot_number": 80.8,
        "f107": 114.2
      },
      {
        "period": "2012",
        "sunspot_number": 84.4,
        "f107": 120.1
      },
      {
        "period": "2013",
        "sunspot_number": 93.7,
        "f107": 122.7
      },
      {
        "period": "2014",
        "sunspot_number": 113.6,
        "f107": 146.5
      },
      {
        "period": "2015",
        "sunspot_number": 69.8,
        "f107": 118
      },
      {
        "period": "2016",
        "sunspot_number": 39.8,
        "f107": 88.9
      },
      {
        "period": "2017",
        "sunspot_number": 21.8,
        "f107": 77.5
      },
      {
        "period": "2018",
        "sunspot_number": 7,
        "f107": 69.9
      },
      {
        "period": "2019",
        "sunspot_number": 3.6,
        "f107": 69.7
      },
      {
        "period": "2020",
        "sunspot_number": 8.8,
        "f107": 73.8
      },
      {
        "period": "2021",
        "sunspot_number": 29.5,
        "f107": 81.8
      },
      {
        "period": "2022",
        "sunspot_number": 83,
        "f107": 124.6
      },
      {
        "period": "2023",
        "sunspot_number": 125.3,
        "f107": 159.9
      },
      {
        "period": "2024",
        "sunspot_number": 154.5,
        "f107": 190.7
      },
      {
        "period": "2025",
        "sunspot_number": 123.5,
        "f107": 154.6
      },
      {
        "period": "2026",
        "sunspot_number": 85.3,
        "f107": 128.8
      }
    ]
  },
  "source": "NOAA Space Weather Prediction Center",
  "license": "U.S. Government Public Domain (NOAA Space Weather Prediction Center)"
}

Source & license