{
  "startDate": "2015-09-01T00:32:55Z",
  "stopDate": "2025-08-29T23:04:25Z",
  "sampleStartDate": "2025-08-25T16:07:25Z",
  "sampleStopDate": "2025-08-26T07:14:22Z",
  "cadence": "PT58.055327S",
  "x_cadence_fraction": 0.018518518518518517,
  "x_cadence_note": "Counts based on variable 'Epoch' in https://cdaweb.gsfc.nasa.gov/sp_phys/data/mms/mms1/fpi/slow/l2/des-dist/2015/09/mms1_fpi_slow_l2_des-dist_20150901003255_v3.4.0.cdf. The most common cadence, 58055327000 [ns] = PT58.055327S, occurred for 1.8519% of the 2 timesteps.",
  "maxRequestDuration": "PT2720850S",
  "resourceURL": "https://cdaweb.gsfc.nasa.gov/misc/NotesM.html#MMS1_FPI_SLOW_L2_DES-DIST",
  "contact": "J. Burch, D. Gershman @ SwRI, GSFC",
  "parameters": [
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      "units": "UTC",
      "length": 30,
      "fill": null,
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      "x_cdf_NAME": "Epoch",
      "x_cdf_DataType": "CDF_TIME_TT2000"
    },
    {
      "name": "mms1_des_errorflags_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_UINT4",
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      "fill": "4.294967295E9",
      "units": "32-bit error flags",
      "x_label": "errFlags",
      "x_cdf_FORMAT": "I10",
      "x_cdf_FIELDNAM": "MMS1 FPI/DES quality error flag",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "mms1_des_startdelphi_count_slow",
      "type": "integer",
      "x_cdf_DataType": "CDF_UINT2",
      "description": "MMS1 FPI/DES Del-Phi (obs spin-phase) count at survey-start time",
      "fill": "65535",
      "units": "del-phi counts",
      "x_label": "DelPhi_cnt",
      "x_cdf_FORMAT": "I4.4",
      "x_cdf_FIELDNAM": "MMS1 FPI/DES start Del-Phi count",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "mms1_des_startdelphi_angle_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES Del-Phi (obs spin-phase) angle at survey-start time",
      "fill": "-1.0E31",
      "units": "deg",
      "x_label": "DelPhi_ang",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DES start Del-Phi angle",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
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      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES Slow Survey sky-map instrument distribution",
      "fill": "-1.0E31",
      "units": "s^3/cm^6",
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          "36.5 deg",
          "59.0 deg",
          "81.5 deg",
          "104.0 deg",
          "126.5 deg",
          "149.0 deg",
          "171.5 deg",
          "194.0 deg",
          "216.5 deg",
          "239.0 deg",
          "261.5 deg",
          "284.0 deg",
          "306.5 deg",
          "329.0 deg",
          "351.5 deg"
        ],
        [
          "5.6250 deg",
          "16.875 deg",
          "28.125 deg",
          "39.375 deg",
          "50.625 deg",
          "61.875 deg",
          "73.125 deg",
          "84.375 deg",
          "95.625 deg",
          "106.88 deg",
          "118.13 deg",
          "129.38 deg",
          "140.63 deg",
          "151.88 deg",
          "163.13 deg",
          "174.38 deg"
        ],
        [
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          "energy05",
          "energy07",
          "energy07",
          "energy08",
          "energy09",
          "energy10",
          "energy11",
          "energy12",
          "energy13",
          "energy14",
          "energy15",
          "energy16",
          "energy17",
          "energy18",
          "energy19",
          "energy20",
          "energy21",
          "energy22",
          "energy23",
          "energy24",
          "energy25",
          "energy26",
          "energy27",
          "energy28",
          "energy29",
          "energy30",
          "energy31"
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      ],
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
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    {
      "name": "mms1_des_disterr_slow",
      "type": "double",
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      "fill": "-1.0E31",
      "units": "s^3/cm^6",
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          "36.5 deg",
          "59.0 deg",
          "81.5 deg",
          "104.0 deg",
          "126.5 deg",
          "149.0 deg",
          "171.5 deg",
          "194.0 deg",
          "216.5 deg",
          "239.0 deg",
          "261.5 deg",
          "284.0 deg",
          "306.5 deg",
          "329.0 deg",
          "351.5 deg"
        ],
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          "5.6250 deg",
          "16.875 deg",
          "28.125 deg",
          "39.375 deg",
          "50.625 deg",
          "61.875 deg",
          "73.125 deg",
          "84.375 deg",
          "95.625 deg",
          "106.88 deg",
          "118.13 deg",
          "129.38 deg",
          "140.63 deg",
          "151.88 deg",
          "163.13 deg",
          "174.38 deg"
        ],
        [
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          "energy01",
          "energy02",
          "energy03",
          "energy04",
          "energy05",
          "energy07",
          "energy07",
          "energy08",
          "energy09",
          "energy10",
          "energy11",
          "energy12",
          "energy13",
          "energy14",
          "energy15",
          "energy16",
          "energy17",
          "energy18",
          "energy19",
          "energy20",
          "energy21",
          "energy22",
          "energy23",
          "energy24",
          "energy25",
          "energy26",
          "energy27",
          "energy28",
          "energy29",
          "energy30",
          "energy31"
        ]
      ],
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DES slowSkyMap distErr",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
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      ]
    },
    {
      "name": "mms1_des_avgf1counts_slow",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES slow survey average f1 count values",
      "fill": "-1.0E31",
      "units": "s^3/cm^6",
      "x_label": "avg 1-count level",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DES avgf1counts",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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  "x_info_author": "bw",
  "x_cdaweb_hapi_version": "20260130.0606",
  "x_info_caching": false,
  "status": {
    "code": 1200,
    "message": "OK"
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  "HAPI": "3.2",
  "x_LastUpdate": "2026-05-12T15:23:57Z"
}