{
  "HAPI": "3.3.1",
  "status": {
    "code": 1200,
    "message": "OK"
  },
  "startDate": "1981-01-01T00:00:00Z",
  "stopDate": "2026-09-01T00:00:00Z",
  "cadence": "PT1M",
  "timeStampLocation": "center",
  "modificationDate": "2026-09-02T20:45:04Z",
  "maxRequestDuration": "P366D",
  "title": "ASY/SYM Indices (Provisional, 1-minute)",
  "description": "Mid-latitude geomagnetic disturbance indices ASY-D, ASY-H, SYM-D, SYM-H (1-minute): symmetric (SYM) and longitudinally asymmetric (ASY) disturbance fields in the H and D components; SYM-H is essentially equivalent to the hourly Dst index at 1-minute resolution. Provided by WDC for Geomagnetism, Kyoto. Provisional version only. Timestamps are bin centers on the UT minute (timeStampLocation=center).",
  "resourceID": "doi:10.14989/267216",
  "datasetCitation": "World Data Center for Geomagnetism, Kyoto, S. Imajo, A. Matsuoka, H. Toh, and T. Iyemori (2022), Mid-latitude Geomagnetic Indices ASY and SYM (ASY/SYM Indices), doi:10.14989/267216",
  "licenseURL": "https://wdc.kugi.kyoto-u.ac.jp/wdc/Sec3.html",
  "parameters": [
    {
      "name": "Time",
      "type": "isotime",
      "units": "UTC",
      "fill": null,
      "length": 24,
      "label": "Time"
    },
    {
      "name": "asyDValue",
      "type": "integer",
      "units": "nT",
      "fill": "99999",
      "label": "ASY-D"
    },
    {
      "name": "asyHValue",
      "type": "integer",
      "units": "nT",
      "fill": "99999",
      "label": "ASY-H"
    },
    {
      "name": "symDValue",
      "type": "integer",
      "units": "nT",
      "fill": "99999",
      "label": "SYM-D"
    },
    {
      "name": "symHValue",
      "type": "integer",
      "units": "nT",
      "fill": "99999",
      "label": "SYM-H"
    },
    {
      "name": "versionCode",
      "type": "integer",
      "units": null,
      "fill": null,
      "label": "Version Code",
      "description": "Processing status code Mm (M: 0=real-time,1=provisional,2=final; m=minor, the recalculation generation within the same major: 0=first conversion, 1 and above=reconverted after the source changed)."
    }
  ],
  "x_LastUpdate": "2026-09-23T15:05:51Z"
}