{
  "startDate": "1998-02-04T00:00:31Z",
  "stopDate": "2024-07-09T23:59:13Z",
  "sampleStartDate": "2024-07-08T00:00:17Z",
  "sampleStopDate": "2024-07-08T23:59:13Z",
  "cadence": "PT1M4S",
  "x_cadence_fraction": 1,
  "x_cadence_note": "Counts based on variable 'Epoch' in https://cdaweb.gsfc.nasa.gov/sp_phys/data/ace/swepam/level_2_cdaweb/swe_h0/1998/ac_h0_swe_19980204_v06.cdf. The most common cadence, 64000 [ms] = PT1M4S, occurred for all 1349 timesteps.",
  "maxRequestDuration": "PT4316800S",
  "resourceURL": "https://cdaweb.gsfc.nasa.gov/misc/NotesA.html#AC_H0_SWE",
  "contact": "D. J. McComas @ SWRI",
  "resourceID": "https://doi.org/10.48322/tsfn-6v47",
  "additionalMetadata": {
    "name": "SPASE",
    "contentURL": "https://spase-metadata.org/NASA/NumericalData/ACE/SWEPAM/L2/PT64S.html"
  },
  "parameters": [
    {
      "name": "Time",
      "type": "isotime",
      "units": "UTC",
      "length": 24,
      "fill": null,
      "x_description": "Time, beginning of interval",
      "x_cdf_NAME": "Epoch",
      "x_cdf_DataType": "CDF_EPOCH"
    },
    {
      "name": "Np",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "Solar Wind Proton Number Density, scalar",
      "fill": "-1.0E31",
      "units": "#/cc",
      "x_label": "H_Density",
      "x_format": ".4f",
      "x_fractionDigits": "4",
      "x_cdf_FORMAT": "F8.4",
      "x_cdf_FIELDNAM": "Proton No. density",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "Vp",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "Solar Wind Bulk Speed",
      "fill": "-1.0E31",
      "units": "km/s",
      "x_label": "SW_H_Speed",
      "x_format": ".2f",
      "x_fractionDigits": "2",
      "x_cdf_FORMAT": "f8.2",
      "x_cdf_FIELDNAM": "Solar Wind Proton Speed",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "Tpr",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "radial component of the proton temperature",
      "fill": "-1.0E31",
      "units": "Kelvin",
      "x_label": "H_Temp_radial",
      "x_format": ".1f",
      "x_fractionDigits": "1",
      "x_cdf_FORMAT": "F9.1",
      "x_cdf_FIELDNAM": "Proton Temperature",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "alpha_ratio",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "alpha to proton density ratio",
      "fill": "-1.0E31",
      "units": "ratio",
      "x_label": "Na/Np",
      "x_format": ".4f",
      "x_fractionDigits": "4",
      "x_cdf_FORMAT": "F8.4",
      "x_cdf_FIELDNAM": "alpha/proton ratio",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch"
    },
    {
      "name": "V_GSE",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "Solar Wind Velocity in GSE coord., 3 components",
      "fill": "-1.0E31",
      "units": "km/s",
      "x_label": [
        "VX (GSE)",
        "VY (GSE)",
        "VZ (GSE)"
      ],
      "x_format": ".1f",
      "x_fractionDigits": "1",
      "x_cdf_FORMAT": "f8.1",
      "x_cdf_FIELDNAM": "Solar Wind Velocity (GSE)",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
        3
      ]
    },
    {
      "name": "V_RTN",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "Solar Wind Velocity in RTN coord., 3 components",
      "fill": "-1.0E31",
      "units": "km/s",
      "x_label": [
        "VR (RTN)",
        "VT (RTN)",
        "VN (RTN)"
      ],
      "x_format": ".1f",
      "x_fractionDigits": "1",
      "x_cdf_FORMAT": "f8.1",
      "x_cdf_FIELDNAM": "Solar Wind Velocity (RTN)",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
        3
      ]
    },
    {
      "name": "V_GSM",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "Solar Wind Velocity in GSM coord., 3 comp.",
      "fill": "-1.0E31",
      "units": "km/s",
      "x_label": [
        "VX (GSM)",
        "VY (GSM)",
        "VZ (GSM)"
      ],
      "x_format": ".1f",
      "x_fractionDigits": "1",
      "x_cdf_FORMAT": "f8.1",
      "x_cdf_FIELDNAM": "Solar Wind Velocity (GSM)",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
        3
      ]
    },
    {
      "name": "SC_pos_GSE",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "ACE s/c position, 3 comp. in GSE coord.",
      "fill": "-1.0E31",
      "units": "km",
      "x_label": [
        "ACE X-GSE",
        "ACE Y-GSE",
        "ACE Z-GSE"
      ],
      "x_format": ".1f",
      "x_fractionDigits": "1",
      "x_cdf_FORMAT": "f9.1",
      "x_cdf_FIELDNAM": "S/C position in GSE",
      "x_cdf_DISPLAY_TYPE": "default_dimension",
      "x_cdf_DEPEND_0": "Epoch",
      "size": [
        3
      ]
    },
    {
      "name": "SC_pos_GSM",
      "type": "double",
      "x_cdf_DataType": "CDF_REAL4",
      "description": "ACE s/c position, 3 comp. in GSM coord.",
      "fill": "-1.0E31",
      "units": "km",
      "x_label": [
        "ACE X(GSM)",
        "ACE Y(GSM)",
        "ACE Z(GSM)"
      ],
      "x_format": ".1f",
      "x_fractionDigits": "1",
      "x_cdf_FORMAT": "f9.1",
      "x_cdf_FIELDNAM": "S/C position in 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": "2026-04-12T15:08:16Z"
}