{
  "startDate": "1974-06-08T06:45:10Z",
  "stopDate": "1978-04-26T15:59:05Z",
  "sampleStartDate": "1978-04-25T00:00:15Z",
  "sampleStopDate": "1978-04-25T23:59:23Z",
  "cadence": "PT23.04S",
  "x_cadence_fraction": 0.9747787610619469,
  "x_cadence_note": "Counts based on variable 'Epoch' in https://cdaweb.gsfc.nasa.gov/sp_phys/data/hawkeye/vlf/vlf_h0/1974/hk_h0_vlf_19740608_v01.cdf. The most common cadence, 23040 [ms] = PT23.04S, occurred for 97.4779% of the 2203 timesteps. ",
  "maxRequestDuration": "PT4317400S",
  "resourceURL": "https://cdaweb.gsfc.nasa.gov/misc/NotesH.html#HK_H0_VLF",
  "contact": "D. Gurnett @ University of Iowa",
  "resourceID": "https://doi.org/10.48322/etz7-wx98",
  "additionalMetadata": {
    "name": "SPASE",
    "contentURL": "https://spase-metadata.org/NASA/NumericalData/Hawkeye/VLF/PT22S.html"
  },
  "parameters": [
    {
      "name": "Time",
      "type": "isotime",
      "units": "UTC",
      "length": 24,
      "fill": null,
      "x_description": "Center TIme of 22 sec averaging period",
      "x_cdf_NAME": "Epoch",
      "x_cdf_DataType": "CDF_EPOCH"
    },
    {
      "name": "b_spd",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "Magnetic Field Spectral Power Density at 8 Freq (2 - 5620 Hz)",
      "fill": "-1.0E31",
      "units": "nT**2/Hz",
      "x_label": "Mag SPD",
      "x_cdf_FIELDNAM": "Magnetic Field Spectral Power Density",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
        8
      ],
      "bins": [
        {
          "name": "b_freq",
          "description": "8 Associated Magnetic Field Freq (1.78 - 5620 Hz)",
          "centers": [
            1.8,
            5.6,
            17.8,
            56.2,
            178,
            562,
            1780,
            5620
          ],
          "x_label": "B Frequency",
          "units": "Hz"
        }
      ]
    },
    {
      "name": "e_spd",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "Electric Spectral Power Density at 16 Frequencies (2 Hz - 178 kHz)",
      "fill": "-1.0E31",
      "units": "(V/m)(V/m)/Hz",
      "x_label": "Elec SPD",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "e6.2",
      "x_cdf_FIELDNAM": "Electric Spectral Power Density",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
        16
      ],
      "bins": [
        {
          "name": "e_freq",
          "description": "16 Electric Field assoc Frequencies (2Hz - 178kHz)",
          "centers": [
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            5.6,
            17.8,
            56.2,
            178,
            562,
            1780,
            5620,
            13300,
            17800,
            23700,
            31100,
            42200,
            56200,
            100000,
            178000
          ],
          "x_label": "Freq E",
          "units": "Hz"
        }
      ]
    },
    {
      "name": "BAVE",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "Average magnetic Field Magnitude",
      "fill": "-1.0E31",
      "units": null,
      "x_label": "Bave",
      "x_cdf_FIELDNAM": "Average Magnetic Field Magnitude",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "pos_mag",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "Hawkeye position in Earth radii, SM magnetic latitude, SM magnetic local time",
      "fill": "-1.0E31",
      "units": [
        "Re",
        "Deg",
        "Hour"
      ],
      "x_label": [
        "Re",
        "SM Lat",
        "SM LT"
      ],
      "x_format": ".1f",
      "x_fractionDigits": "1",
      "x_cdf_FORMAT": "f7.1",
      "x_cdf_FIELDNAM": "s/c position in SM lat/local time",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
        3
      ]
    },
    {
      "name": "pos_GSM",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "Cartesian Position GSM",
      "fill": "-1.0E31",
      "units": "RE",
      "x_label": [
        "x GSM",
        "y GSM",
        "z GSM"
      ],
      "x_cdf_FIELDNAM": "Cartesian Position GSM",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
        3
      ]
    }
  ],
  "x_info_author": "bw",
  "x_cdaweb_hapi_version": "20260130.0606",
  "x_info_caching": false,
  "status": {
    "code": 1200,
    "message": "OK"
  },
  "HAPI": "3.2",
  "x_LastUpdate": "2026-04-12T15:10:15Z"
}