{
  "startDate": "2015-09-01T00:00:04Z",
  "stopDate": "2026-03-05T23:59:59Z",
  "sampleStartDate": "2026-03-03T00:00:06Z",
  "sampleStopDate": "2026-03-03T23:59:59Z",
  "cadence": "PT0.062501S",
  "x_cadence_fraction": 0.37399266330705444,
  "x_cadence_note": "Counts based on variable 'Epoch' in https://cdaweb.gsfc.nasa.gov/sp_phys/data/mms/mms4/fgm/srvy/l2/2015/09/mms4_fgm_srvy_l2_20150901_v4.18.0.cdf. The most common cadence, 62500756 [ns] = PT0.062501S, occurred for 37.3993% of the 410252 timesteps. ",
  "maxRequestDuration": "PT4319650S",
  "resourceURL": "https://cdaweb.gsfc.nasa.gov/misc/NotesM.html#MMS4_FGM_SRVY_L2",
  "contact": "J. Burch, C. Russell, W. Magnus @ SWRI, UCLA, IWF",
  "resourceID": "https://doi.org/10.48322/50p5-d131",
  "additionalMetadata": {
    "name": "SPASE",
    "contentURL": "https://spase-metadata.org/NASA/NumericalData/MMS/4/FIELDS/FGM/Survey/Level2/PT0.125S.html"
  },
  "parameters": [
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      "name": "Time",
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      "length": 30,
      "fill": null,
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      "x_cdf_DataType": "CDF_TIME_TT2000"
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        "By GSE",
        "Bz GSE",
        "Bt"
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      "x_fractionDigits": "5",
      "x_cdf_FORMAT": "E13.5",
      "x_cdf_FIELDNAM": "Magnetic field vector in GSE plus Btotal (8 or 16 S/s)",
      "x_cdf_VIRTUAL": "true",
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      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
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      "x_cdf_DataType": "CDF_REAL4",
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      "fill": "-1.0E31",
      "units": "nT (all flags)",
      "x_label": [
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    },
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      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "Magnetic field vector in Despun MPA-aligned cartesian coordinates plus Btotal (8 or 16 S/s)",
      "fill": "-1.0E31",
      "units": "nT",
      "x_label": [
        "Bx DMPA",
        "By DMPA",
        "Bz DMPA",
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      "x_cdf_FORMAT": "E13.5",
      "x_cdf_FIELDNAM": "Magnetic field vector in DMPA plus Btotal (8 or 16 S/s)",
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      "x_cdf_DISPLAY_TYPE": "default_dimension",
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    },
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      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
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      "units": "nT (all flags)",
      "x_label": [
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        "By DMPA",
        "Bz DMPA",
        "Bt"
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  "x_info_author": "bw",
  "x_cdaweb_hapi_version": "20260130.0606",
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  "x_LastUpdate": "2026-04-12T15:11:43Z"
}