{
  "startDate": "2015-09-01T00:00:01Z",
  "stopDate": "2026-04-10T05:49:28Z",
  "sampleStartDate": "2026-04-10T00:00:03Z",
  "sampleStopDate": "2026-04-10T01:59:58Z",
  "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/des-momsaux/2015/09/mms1_fpi_fast_l2_des-momsaux_20150901000000_v3.4.0.cdf. The most common cadence, 4500031000 [ns] = PT4.500031S, occurred for 30.9859% of the 22 timesteps.",
  "maxRequestDuration": "PT359750S",
  "resourceURL": "https://cdaweb.gsfc.nasa.gov/misc/NotesM.html#MMS1_FPI_FAST_L2_DES-MOMSAUX",
  "contact": "J. Burch, B. Giles @ SwRI, GSFC",
  "parameters": [
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      "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_des_errorflags_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_UINT4",
      "description": "MMS1 FPI/DES 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/DES dataQuality errorFlags",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "mms1_des_numberdensity_part_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES partial electron 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/DES partial number density",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
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      ]
    },
    {
      "name": "mms1_des_bulkv_part_dbcs_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES partial electron bulk-velocity vector in DBCS during this survey",
      "fill": "-1.0E31",
      "units": "km/s",
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        "Vy_DBCS",
        "Vz_DBCS"
      ],
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      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DES DBCS partial bulk v",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
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        3
      ]
    },
    {
      "name": "mms1_des_bulkv_part_gse_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES partial electron 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_fractionDigits": "2",
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      "x_cdf_FIELDNAM": "MMS1 FPI/DES GSE partial bulk v",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
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      ]
    },
    {
      "name": "mms1_des_prestensor_part_dbcs_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES partial electron pressure tensor in DBCS during this survey",
      "fill": "-1.0E31",
      "units": "nPa",
      "x_label": "P_DBCS",
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      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
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    },
    {
      "name": "mms1_des_prestensor_part_gse_fast",
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      "description": "MMS1 FPI/DES partial electron pressure tensor in GSE during this survey",
      "fill": "-1.0E31",
      "units": "nPa",
      "x_label": "P_GSE",
      "x_labelComponents": [
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    },
    {
      "name": "mms1_des_temptensor_part_dbcs_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES partial electron temperature tensor in DBCS during this survey",
      "fill": "-1.0E31",
      "units": "eV",
      "x_label": "T_DBCS",
      "x_labelComponents": [
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      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DES DBCS partial temp tensor",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
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      ]
    },
    {
      "name": "mms1_des_temptensor_part_gse_fast",
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      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES partial electron temperature tensor in GSE during this survey",
      "fill": "-1.0E31",
      "units": "eV",
      "x_label": "T_GSE",
      "x_labelComponents": [
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          "z"
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      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DES GSE partial temp tensor",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
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      ]
    },
    {
      "name": "mms1_des_temppara_part_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES partial electron parallel temperature during this survey",
      "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/DES partial tempPara",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
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      ]
    },
    {
      "name": "mms1_des_tempperp_part_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES partial electron perpendicular temperature during this survey",
      "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/DES partial tempPerp",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms1_des_part_index_fast",
      "type": "integer",
      "x_cdf_DataType": "CDF_UINT2",
      "description": "MMS1 FPI/DES recommended energy index for partial moments during this survey",
      "fill": "65535",
      "units": "0-31",
      "x_label": "part_index",
      "x_cdf_FORMAT": "I4",
      "x_cdf_FIELDNAM": "MMS1 FPI/DES part_index",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "mms1_des_startdelphi_count_fast",
      "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_fast",
      "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"
    },
    {
      "name": "mms1_des_pitchangdist_lowen_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES electron pitch-angle distribution for \"low\" energies during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "PAD_low",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DES pitchAngDist_lowEn",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ],
      "bins": [
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          "name": "mms1_des_alpha_fast",
          "description": "MMS1 FPI/DES fast survey sky-map pitch angles",
          "centers": [
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            15,
            21,
            27,
            33,
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            171,
            177
          ],
          "x_label": "pitch_ang",
          "units": "deg"
        }
      ]
    },
    {
      "name": "mms1_des_pitchangdist_miden_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES electron pitch-angle distribution for \"mid\" energies during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "PAD_mid",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DES pitchAngDist_midEn",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
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      "bins": [
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          "description": "MMS1 FPI/DES fast survey sky-map pitch angles",
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            15,
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            171,
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          ],
          "x_label": "pitch_ang",
          "units": "deg"
        }
      ]
    },
    {
      "name": "mms1_des_pitchangdist_highen_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES electron pitch-angle distribution for \"high\" energies during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "PAD_high",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DES pitchAngDist_highEn",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
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      "bins": [
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            171,
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          ],
          "x_label": "pitch_ang",
          "units": "deg"
        }
      ]
    },
    {
      "name": "mms1_des_energyspectr_px_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES electron 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/DES energySpectr_pX",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms1_des_energyspectr_mx_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES electron 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/DES energySpectr_mX",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms1_des_energyspectr_py_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES electron 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/DES energySpectr_pY",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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    },
    {
      "name": "mms1_des_energyspectr_my_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES electron 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/DES energySpectr_mY",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms1_des_energyspectr_pz_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES electron 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/DES energySpectr_pZ",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms1_des_energyspectr_mz_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES electron 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/DES energySpectr_mZ",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms1_des_energyspectr_par_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES electron energy parallel to the magnetic field direction during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "DEF_par",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DES energySpectr_par",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms1_des_energyspectr_anti_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES electron energy anti-parallel to the magnetic field direction during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "DEF_anti-par",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DES energySpectr_anti",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms1_des_energyspectr_perp_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES electron energy perpendicular to the magnetic field direction during this survey",
      "fill": "-1.0E31",
      "units": "keV/(cm^2 s sr keV)",
      "x_label": "DEF_perp",
      "x_format": ".2e",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "E12.2",
      "x_cdf_FIELDNAM": "MMS1 FPI/DES energySpectr_perp",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms1_des_energyspectr_omni_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES omni-directional electron 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/DES energySpectr_omni",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
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      ]
    },
    {
      "name": "mms1_des_numberdensity_fast",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "MMS1 FPI/DES electron 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/DES number density",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "mms1_des_densityextrapolation_low_fast",
      "type": "double",
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      "description": "MMS1 FPI/DES estimated (via extrapolation to 0) contribution to density integral below 10eV",
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  "x_LastUpdate": "2026-05-12T15:23:56Z"
}