{
  "HAPI": "3.3.1",
  "status": {
    "code": 1200,
    "message": "OK"
  },
  "startDate": "2001-01-01T00:00:00Z",
  "stopDate": "2018-09-01T00:00:00Z",
  "cadence": "PT1M",
  "timeStampLocation": "center",
  "modificationDate": "2026-08-30T11:25:46Z",
  "maxRequestDuration": "P366D",
  "title": "Esashi Observatory (Best Available, 1-minute)",
  "description": "Esashi (ESA) 1-minute geomagnetic field, served as the components natively reported in the source. Timestamps are bin centers (timeStampLocation=center). Best available version per period.",
  "licenseURL": "https://wdc.kugi.kyoto-u.ac.jp/wdc/Sec3.html",
  "x_observatory": {
    "name": "Esashi",
    "iagaCode": "ESA",
    "latitude": 39.237,
    "longitude": 141.355,
    "elevation": 396,
    "country": "Japan"
  },
  "x_sourceMetadata": [
    {
      "startDate": "2001-01-01T00:00:00Z",
      "stopDate": "2001-03-01T00:00:00Z",
      "sourceOfData": "Geographical Survey Institute",
      "sensorOrientation": "HDZF",
      "digitalSampling": "1 second",
      "dataIntervalType": "1-minute (00:30 - 01:29)",
      "dataType": "Definitive"
    },
    {
      "startDate": "2007-01-01T00:00:00Z",
      "stopDate": "2009-01-01T00:00:00Z",
      "sensorOrientation": "HDZF",
      "digitalSampling": "1.0 seconds",
      "dataIntervalType": "Filtered 1-minute (00:30 - 01:29)",
      "dataType": "definitive"
    },
    {
      "startDate": "2009-01-01T00:00:00Z",
      "stopDate": "2010-04-01T00:00:00Z",
      "sourceOfData": "Geographical Survey Institute",
      "sensorOrientation": "HDZF",
      "digitalSampling": "1 second",
      "dataIntervalType": "1-minute (00:30 - 01:29)",
      "dataType": "Definitive"
    },
    {
      "startDate": "2010-04-01T00:00:00Z",
      "stopDate": "2011-01-01T00:00:00Z",
      "sourceOfData": "Geospatial Information Authority of Japan",
      "sensorOrientation": "DHZF",
      "digitalSampling": "1 second",
      "dataIntervalType": "1-minute (00:30 - 01:29)",
      "dataType": "Definitive"
    },
    {
      "startDate": "2011-01-01T00:00:00Z",
      "stopDate": "2011-02-01T00:00:00Z",
      "sourceOfData": "Geospatial Information Authority of Japan",
      "sensorOrientation": "HDZF",
      "digitalSampling": "1 second",
      "dataIntervalType": "1-minute (00:30 - 01:29)",
      "dataType": "Definitive"
    },
    {
      "startDate": "2011-02-01T00:00:00Z",
      "stopDate": "2011-04-01T00:00:00Z",
      "sourceOfData": "Geospatial Information Authority of Japan",
      "sensorOrientation": "HDZF",
      "digitalSampling": "1 second",
      "dataIntervalType": "1-minute (00:30 - 01:29)",
      "dataType": "Definitivel"
    },
    {
      "startDate": "2011-04-01T00:00:00Z",
      "stopDate": "2018-09-01T00:00:00Z",
      "sourceOfData": "Geospatial Information Authority of Japan",
      "sensorOrientation": "HDZF",
      "digitalSampling": "1 second",
      "dataIntervalType": "1-minute (00:30 - 01:29)",
      "dataType": "Definitive"
    }
  ],
  "x_sourceComments": [
    {
      "startDate": "2001-01-01T00:00:00Z",
      "stopDate": "2001-03-01T00:00:00Z",
      "comments": [
        "Converted to IAGA2002 format",
        "  by WDC for Geomagnetism, Kyoto,  2005-11-18"
      ]
    },
    {
      "startDate": "2009-01-01T00:00:00Z",
      "stopDate": "2012-01-01T00:00:00Z",
      "comments": [
        " Converted to IAGA2002 format",
        "  by WDC for Geomagnetism, Kyoto, 2005-11-18"
      ]
    },
    {
      "startDate": "2016-04-01T00:00:00Z",
      "stopDate": "2016-05-01T00:00:00Z",
      "comments": [
        " Converted to IAGA2002 format",
        "  by WDC for Geomagnetism, Kyoto, 2005-11-18"
      ]
    }
  ],
  "parameters": [
    {
      "name": "Time",
      "type": "isotime",
      "units": "UTC",
      "fill": null,
      "length": 24,
      "label": "Time"
    },
    {
      "name": "geomagneticFieldD",
      "type": "double",
      "units": "arcmin",
      "fill": "99999.0",
      "label": "D",
      "description": "Geomagnetic declination (eastward+), minutes of arc. Native when reported (horizontal reported as D,H); else fill."
    },
    {
      "name": "geomagneticFieldH",
      "type": "double",
      "units": "nT",
      "fill": "99999.0",
      "label": "H",
      "description": "Geomagnetic horizontal intensity. Native when reported; else fill."
    },
    {
      "name": "geomagneticFieldX",
      "type": "double",
      "units": "nT",
      "fill": "99999.0",
      "label": "X",
      "description": "Geomagnetic north component. Native when reported (horizontal reported as X,Y); else fill. Not derived from H,D."
    },
    {
      "name": "geomagneticFieldY",
      "type": "double",
      "units": "nT",
      "fill": "99999.0",
      "label": "Y",
      "description": "Geomagnetic east component. Native when reported; else fill. Not derived from H,D."
    },
    {
      "name": "geomagneticFieldZ",
      "type": "double",
      "units": "nT",
      "fill": "99999.0",
      "label": "Z",
      "description": "Geomagnetic vertical (downward+) component."
    },
    {
      "name": "geomagneticFieldF",
      "type": "double",
      "units": "nT",
      "fill": "99999.0",
      "label": "F",
      "description": "Total field intensity, measured by an instrument independent of the vector components. Element letter F in the IAGA2002/WDC native output. Fill when the source reports no total field. Note that fill covers two distinct cases the source writes differently (99999 = measured but missing, 88888 = not observed at all); see x_unreportedElements for the periods in which an element was not observed."
    },
    {
      "name": "geomagneticFieldI",
      "type": "double",
      "units": "arcmin",
      "fill": "99999.0",
      "label": "I",
      "description": "Geomagnetic inclination, minutes of arc. Reserved column: native only when reported; otherwise fill."
    },
    {
      "name": "versionCode",
      "type": "integer",
      "units": null,
      "fill": null,
      "label": "Version Code",
      "description": "Processing status code Mm following IAGA2002 Data Type (M: 0=variation, 1=provisional, 2=quasi-definitive, 3=definitive; m=minor, the recalculation generation within the same major: 0=first conversion, 1 and above=reconverted after the source changed)."
    }
  ],
  "x_LastUpdate": "2026-09-23T15:06:56Z"
}