{
  "startDate": "2015-09-01T00:00Z",
  "stopDate": "2026-03-05T23:59:59Z",
  "sampleStartDate": "2026-03-05T18:00:01Z",
  "sampleStopDate": "2026-03-05T19:59:57Z",
  "cadence": "PT4.500031S",
  "x_cadence_fraction": 0.30985915492957744,
  "x_cadence_note": "Counts based on variable 'Epoch' in https://cdaweb.gsfc.nasa.gov/sp_phys/data/mms/mms1/fpi/fast/l2/dis-moms/2015/09/mms1_fpi_fast_l2_dis-moms_20150901000000_v3.4.0.cdf. The most common cadence, 4500031000 [ns] = PT4.500031S, occurred for 30.9859% of the 22 timesteps. ",
  "maxRequestDuration": "PT359800S",
  "resourceURL": "https://cdaweb.gsfc.nasa.gov/misc/NotesM.html#MMS1_FPI_FAST_L2_DIS-MOMS",
  "contact": "J.Burch; C.Pollock, B.Giles @ SwRI, NASA/GSFC",
  "resourceID": "https://doi.org/10.48322/kgr0-yb53",
  "additionalMetadata": {
    "name": "SPASE",
    "contentURL": "https://spase-metadata.org/NASA/NumericalData/MMS/1/FastPlasmaInvestigation/DIS/Fast/Level2/Moments/PT4.5S.html"
  },
  "parameters": [
    {
      "name": "Time",
      "type": "isotime",
      "units": "UTC",
      "length": 30,
      "fill": null,
      "x_description": "Nanoseconds since J2000",
      "x_cdf_NAME": "Epoch",
      "x_cdf_DataType": "CDF_TIME_TT2000"
    },
    {
      "name": "mms1_dis_errorflags_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_UINT4",
      "description": "MMS1 FPI/DIS vector of data-quality indicators at survey-start time. Note: CDF_UINT4 data was converted to HAPI double.",
      "fill": "4.294967295E9",
      "units": "32-bit error flags",
      "x_label": "errFlags",
      "x_cdf_FORMAT": "I10",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS dataQuality errorFlags",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "mms1_dis_startdelphi_count_fast",
      "type": "integer",
      "x_cdf_DataType": "CDF_UINT2",
      "description": "---> MMS1 FPI/DIS 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/DIS start Del-Phi count",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "mms1_dis_startdelphi_angle_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "---> MMS1 FPI/DIS 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/DIS start Del-Phi angle",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "mms1_dis_energyspectr_px_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DIS ion energy spectrum \"near\" +X_DBCS during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "DEF_px",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS energySpectr_pX",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms1_dis_energyspectr_mx_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "---> MMS1 FPI/DIS ion energy spectrum \"near\" -X_DBCS during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "DEF_mx",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS energySpectr_mX",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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    },
    {
      "name": "mms1_dis_energyspectr_py_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "---> MMS1 FPI/DIS ion energy spectrum \"near\" +Y_DBCS during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "DEF_py",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS energySpectr_pY",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms1_dis_energyspectr_my_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "---> MMS1 FPI/DIS ion energy spectrum \"near\" -Y_DBCS during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "DEF_my",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS energySpectr_mY",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms1_dis_energyspectr_pz_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "---> MMS1 FPI/DIS ion energy spectrum \"near\" +Z_DBCS during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "DEF_pz",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS energySpectr_pZ",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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    },
    {
      "name": "mms1_dis_energyspectr_mz_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "---> MMS1 FPI/DIS ion energy spectrum \"near\" -Z_DBCS during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "DEF_mz",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS energySpectr_mZ",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms1_dis_energyspectr_omni_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DIS omni-directional ion energy spectrum during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "DEF_omni",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS energySpectr_omni",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms1_dis_spectr_bg_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DIS ion background energy during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "DEF_spect_bg",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS spectr_bg",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "mms1_dis_numberdensity_bg_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DIS ion background number density during this survey",
      "fill": "-1.0E31",
      "units": "cm^-3",
      "x_label": "N_bg",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS background number density",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "mms1_dis_numberdensity_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DIS ion number density during this survey",
      "fill": "-1.0E31",
      "units": "cm^-3",
      "x_label": "N",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS number density",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "mms1_dis_densityextrapolation_low_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DIS estimated (via extrapolation to 0) contribution to density integral below 10eV",
      "fill": "-1.0E31",
      "units": "cm^-3",
      "x_label": "N",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS density extrapolation (low)",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "mms1_dis_densityextrapolation_high_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DIS estimated (via extrapolation to infinity) contribution to density integral above 30keV",
      "fill": "-1.0E31",
      "units": "cm^-3",
      "x_label": "N",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS density extrapolation (high)",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "mms1_dis_bulkv_dbcs_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DIS ion bulk-velocity vector in DBCS during this survey",
      "fill": "-1.0E31",
      "units": "km/s",
      "x_label": [
        "Vx_DBCS",
        "Vy_DBCS",
        "Vz_DBCS"
      ],
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS DBCS bulk v",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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    },
    {
      "name": "mms1_dis_bulkv_spintone_dbcs_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DIS ion bulk-velocity estimated spintone vector in DBCS during this survey",
      "fill": "-1.0E31",
      "units": "km/s",
      "x_label": [
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        "Vy_spintone_DBCS",
        "Vz_spintone_DBCS"
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      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS DBCS bulk v spintone",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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    },
    {
      "name": "mms1_dis_bulkv_gse_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DIS ion bulk-velocity vector in GSE during this survey",
      "fill": "-1.0E31",
      "units": "km/s",
      "x_label": [
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        "Vy_GSE",
        "Vz_GSE"
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      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS GSE bulk v",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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    },
    {
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      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DIS ion bulk-velocity estimated spintone vector in GSE during this survey",
      "fill": "-1.0E31",
      "units": "km/s",
      "x_label": [
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        "Vy_spintone_GSE",
        "Vz_spintone_GSE"
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      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS GSE bulk v spintone",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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    },
    {
      "name": "mms1_dis_prestensor_dbcs_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DIS ion pressure tensor in DBCS during this survey",
      "fill": "-1.0E31",
      "units": "nPa",
      "x_label": "P_DBCS",
      "x_labelComponents": [
        [
          "x",
          "y",
          "z"
        ],
        [
          "x",
          "y",
          "z"
        ]
      ],
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS DBCS pres tensor",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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        3
      ]
    },
    {
      "name": "mms1_dis_prestensor_gse_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DIS ion pressure tensor in GSE during this survey",
      "fill": "-1.0E31",
      "units": "nPa",
      "x_label": "P_GSE",
      "x_labelComponents": [
        [
          "x",
          "y",
          "z"
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        [
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          "y",
          "z"
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      ],
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS GSE pres tensor",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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        3
      ]
    },
    {
      "name": "mms1_dis_pres_bg_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DIS ion background pressure during this survey",
      "fill": "-1.0E31",
      "units": "nPa",
      "x_label": "DEF_pres_bg",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS pres_bg",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "mms1_dis_temptensor_dbcs_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DIS ion temperature tensor in DBCS during this survey",
      "fill": "-1.0E31",
      "units": "eV",
      "x_label": "T_DBCS",
      "x_labelComponents": [
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          "x",
          "y",
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        [
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          "y",
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      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS DBCS temp tensor",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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        3
      ]
    },
    {
      "name": "mms1_dis_temptensor_gse_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DIS ion temperature tensor in GSE during this survey",
      "fill": "-1.0E31",
      "units": "eV",
      "x_label": "T_GSE",
      "x_labelComponents": [
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          "y",
          "z"
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        [
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      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS GSE temp tensor",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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        3
      ]
    },
    {
      "name": "mms1_dis_heatq_dbcs_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DIS ion heat-flux vector in DBCS during this survey",
      "fill": "-1.0E31",
      "units": "mW/m^2",
      "x_label": [
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        "Qy_DBCS",
        "Qz_DBCS"
      ],
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS DBCS heatq",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms1_dis_heatq_gse_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DIS ion heat-flux vector in GSE during this survey",
      "fill": "-1.0E31",
      "units": "mW/m^2",
      "x_label": [
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        "Qy_GSE",
        "Qz_GSE"
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      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DIS GSE heatq",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms1_dis_temppara_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DIS ion parallel temperature during this BP",
      "fill": "-1.0E31",
      "units": "eV",
      "x_label": "eT_para",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI1/DIS tempPara",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "mms1_dis_tempperp_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DIS ion perpendicular temperature during this BP",
      "fill": "-1.0E31",
      "units": "eV",
      "x_label": "eT_perp",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI1/DIS tempPerp",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    }
  ],
  "x_info_author": "bw",
  "x_cdaweb_hapi_version": "20260130.0606",
  "x_info_caching": false,
  "status": {
    "code": 1200,
    "message": "OK"
  },
  "HAPI": "3.2",
  "x_LastUpdate": "2026-04-12T15:11:17Z"
}