{
  "HAPI": "3.3.1",
  "status": {
    "code": 1200,
    "message": "OK"
  },
  "startDate": "2001-08-01T00:00:00Z",
  "stopDate": "2003-07-14T03:09:00Z",
  "cadence": "PT1M",
  "timeStampLocation": "center",
  "modificationDate": "2026-08-30T14:48:30Z",
  "maxRequestDuration": "P366D",
  "title": "North West Pacific Observatory (Definitive, 1-minute)",
  "description": "North West Pacific (NWP) 1-minute geomagnetic field, served as the components natively reported in the source. Timestamps are bin centers (timeStampLocation=center). Definitive version.",
  "licenseURL": "https://wdc.kugi.kyoto-u.ac.jp/wdc/Sec3.html",
  "x_observatory": {
    "name": "North West Pacific",
    "iagaCode": "NWP",
    "latitude": 41.102,
    "longitude": 159.963,
    "elevation": -5580,
    "country": "Japan"
  },
  "x_sourceMetadata": [
    {
      "startDate": "2001-08-01T00:00:00Z",
      "stopDate": "2003-07-14T03:09:00Z",
      "sourceOfData": "Dept Earth Science, University of Toyama, Jpn",
      "sensorOrientation": "XYZF",
      "digitalSampling": "8 Hz",
      "dataIntervalType": "Average 1-sec (59.5-0.5)",
      "dataType": "Definitive"
    }
  ],
  "x_sourceComments": [
    {
      "startDate": "2001-08-01T00:00:00Z",
      "stopDate": "2003-07-14T03:09:00Z",
      "comments": [
        " This file contains the Earth's geomagnetic field values observed",
        " at the deep seafloor in the northwest Pacific.  X-, Y- and Z-",
        " components were measured by a vector fluxgate magnetometer, while",
        " F was measured by a scalar Overhauser proton precession",
        " magnetometer.  For more details, refer to:",
        "",
        " Toh, H., Hamano, Y., Ichiki, M. and Utada, H., Geomagnetic",
        "     observatory operates at the seafloor in the Northwest Pacific",
        "     Ocean, Eos, Trans. Amer. Geophys. Union, 85, 467-473, 2004.",
        "",
        " Correspondence: H. Toh at Dept Earth Science, Univ. Toyama, JAPAN",
        "                 toh@sci.toyama-u.ac.jp",
        " H = squareroot(X*X + Y*Y), cos D = X/H, sin I = Z/F"
      ]
    }
  ],
  "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": "2026-09-23T15:08:15Z"
}