{
  "Spase": {
    "xmlns": "http://www.spase-group.org/data/schema",
    "xmlns:xsi": "http://www.w3.org/2001/XMLSchema-instance",
    "xsi:schemaLocation": "http://www.spase-group.org/data/schema http://www.spase-group.org/data/schema/spase-2_3_0.xsd",
    "Version": "2.3.0",
    "NumericalData": {
      "ResourceID": "spase://NASA/NumericalData/Voyager1/MAG/ASCII/PT48S",
      "ResourceHeader": {
        "ResourceName": "Voyager 1 48-s Triaxial Fluxgate Magnetometer (MAG) Magnetic Field Data in ASCII Format",
        "ReleaseDate": "2021-06-02T21:15:53Z",
        "Description": "The average magnetic field strength produced by the spacecraft at the location of the \n        outboard magnetometer, of the dual magnetometers system on V1, varies between 0.1 and 0.2 nT, comparable \n        to the most probable magnetic field strength in the inner heliosheath and significantly larger \n        than the most probable magnetic field strength in the distant supersonic solar wind. The spacecraft \n        magnetic field is a complex, time-dependent signal that must be removed from the measured magnetic \n        field signal in order to derive the ambient magnetic fields of the solar wind and heliosheath.  \n        Corrections must also be made for spurious magnetic signals and noise associated with the telemetry \n        system, ground tracking systems, and other factors. Extracting the signal describing the solar wind \n        and heliosheath from the many sources of uncertainty is a complex and partly subjective process that \n        requires understanding of the instrument and judgment based on experience in dealing with the \n        ever-changing extraneous signals. We estimate that the 1-sigma uncertainty in the 48 sec averages \n        in the components of the magnetic field is typically +/- 0.02 nT. The uncertainties in F1, BR, BT, \n        and BN can differ from one another and they may vary with time, but there is no practical way to \n        determine these uncertainties more precisely at present.  This descriptor, and the data\n        access path identified below, are specific to 48s Voyager 1 MAG data taken when the spacecraft\n        was in the vicinity of, and beyond, the heliospheric termination shock.\n\n        References \n        \n        Behannon, K.W., M.H. Acuna, L.F. Burlaga, R.P. Lepping, N.F. Ness, and F.M. Neubauer, \n        Magnetic-Field Experiment for Voyager-1 and Voyager-2, Space Science Reviews, 21 (3), 235-257, 1977. \n\n        Burlaga, L.F., Merged interaction regions and large-scale magnetic field fluctuations during 1991 - \n        Voyager-2 observations, J. Geophys. Res., 99 (A10), 19341-19350, 1994. \n\n        Burlaga, L.F., N.F. Ness, Y.-M. Wang, and N.R. Sheeley Jr., Heliospheric magnetic field strength and \n        polarity from 1 to 81 AU during the ascending phase of solar cycle 23, J. Geophys. Res., 107 (A11), 1410, 2002. \n\n        Ness, N., K.W. Behannon, R. Lepping, and K.H. Schatten, J. Geophys. Res., , 76, 3564, 1971.\n        \n      ",
        "Acknowledgement": "Please acknowledge the Principal Investigator, N. Ness of University of Delaware and Co-Investigator L. Burlaga of NASA GSFC.",
        "Contact": [
          {
            "PersonID": "spase://SMWG/Person/Norman.F.Ness",
            "Role": "PrincipalInvestigator"
          },
          {
            "PersonID": "spase://SMWG/Person/Leonard.F.Burlaga",
            "Role": "CoInvestigator"
          },
          {
            "PersonID": "spase://SMWG/Person/Jan.Merka",
            "Role": "MetadataContact"
          },
          {
            "PersonID": "spase://SMWG/Person/Todd.A.King",
            "Role": "MetadataContact"
          }
        ],
        "InformationURL": {
          "Name": "Readme at Voyager MAG team web site",
          "URL": "https://vgrmag-data.gsfc.nasa.gov/pub/data/voyager/vgrmag-data/summary/readme.summary"
        },
        "PriorID": [
          "spase://VHO/NumericalData/Voyager1/MAG/PT48S",
          "spase://VSPO/NumericalData/Voyager1/MAG/PT48S",
          "spase://VSPO/NumericalData/Voyager1/MAG/ASCII/PT48S"
        ]
      },
      "AccessInformation": [
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/Voyager/MAG",
          "Availability": "Online",
          "AccessRights": "Open",
          "AccessURL": {
            "Name": "Voyager/MAG team site",
            "URL": "https://vgrmag-data.gsfc.nasa.gov/pub/data/voyager/vgrmag-data/summary/v1/"
          },
          "Format": "Text"
        },
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
          "AccessURL": [
            {
              "Name": "FTPS from SPDF (not with most browsers)",
              "URL": "ftps://spdf.gsfc.nasa.gov/pub/data/voyager/voyager1/magnetic_fields/ip_48s_ascii/data/",
              "Description": "In ascii via ftp from SPDF"
            },
            {
              "Name": "HTTPS from SPDF",
              "URL": "https://spdf.gsfc.nasa.gov/pub/data/voyager/voyager1/magnetic_fields/ip_48s_ascii/data/",
              "Description": "In ascii via HTTP from SPDF"
            }
          ],
          "Format": "Text.ASCII"
        },
        {
          "RepositoryID": "spase://SMWG/Repository/PDS/PPI",
          "Availability": "Online",
          "AccessRights": "Open",
          "AccessURL": {
            "Name": "PDS/PPI",
            "URL": "https://pds-ppi.igpp.ucla.edu/search/view/?f=yes&id=pds://PPI/VG1-SW-MAG-4-SUMM-HGCOORDS-48SEC-V1.0",
            "ProductKey": "VG1-SW-MAG-4-SUMM-HGCOORDS-48SEC-V1.0",
            "Description": "This collection is archived with NASA's Planetary Data System.",
            "Language": "En"
          },
          "Format": "Text.ASCII",
          "Acknowledgement": "NASA's Planetary Plasma Interactions (PPI) Node of the Planetary Data System (PDS) and the P.I. for the data."
        }
      ],
      "ProviderProcessingLevel": "CALIBRATED",
      "InstrumentID": "spase://SMWG/Instrument/Voyager1/MAG",
      "MeasurementType": "MagneticField",
      "TemporalDescription": {
        "TimeSpan": {
          "StartDate": "1977-09-05T00:00:00",
          "StopDate": "1990-12-31T00:00:00"
        },
        "Cadence": "PT48S"
      },
      "ObservedRegion": [
        "Heliosphere.Outer",
        "Heliosphere.Heliosheath"
      ],
      "Caveats": "Extracting the signal describing the solar wind and heliosheath from the many sources of uncertainty is a complex and \n      partly subjective process that requires understanding of the instrument and judgment based on experience in dealing with \n      the ever-changing extraneous signals. As a result, users should consult the specific caveats that are included in the header\n      of each granule.  The granule headers list any caveats that are specific to that time interval.",
      "Parameter": [
        {
          "Name": "Spacecraft ID",
          "ParameterKey": "Column_1",
          "Description": "Spacecraft ID. Value FLT1 means Voyager 1.",
          "Support": {
            "SupportQuantity": "Other"
          }
        },
        {
          "Name": "Coordinate system",
          "ParameterKey": "Column_2",
          "Description": "Flag for coordinate system.  Virtually all values are HG,\nmeaning Heliographic Inertial",
          "Support": {
            "SupportQuantity": "Other"
          }
        },
        {
          "Name": "Year",
          "ParameterKey": "Column_3",
          "Description": "Year of the measurement, 2 digits",
          "Support": {
            "SupportQuantity": "Temporal"
          }
        },
        {
          "Name": "Day of year",
          "ParameterKey": "Column_4",
          "Description": "Fractional day of year of the measurement (Jan 1 = 1).",
          "ValidMin": "1",
          "ValidMax": "366.9999",
          "Support": {
            "SupportQuantity": "Temporal"
          }
        },
        {
          "Name": "B",
          "ParameterKey": "Column_5",
          "Description": "The magnetic field strength, the average of higher resolution field strengths, in nT",
          "Units": "nT",
          "Field": {
            "Qualifier": [
              "Magnitude",
              "Average"
            ],
            "FieldQuantity": "Magnetic"
          }
        },
        {
          "Name": "Magnitude average",
          "ParameterKey": "Column_6",
          "Description": "Magnitude of vector constituted by average field components",
          "Units": "nT",
          "Field": {
            "Qualifier": [
              "Magnitude",
              "Average"
            ],
            "FieldQuantity": "Magnetic"
          }
        },
        {
          "Name": "Field elevation angle",
          "ParameterKey": "Column_7",
          "Description": "Elevation angle of magnetic field vector",
          "Units": "Deg",
          "CoordinateSystem": {
            "CoordinateRepresentation": "Spherical",
            "CoordinateSystemName": "RTN"
          },
          "ValidMin": "-90.",
          "ValidMax": "90.",
          "Field": {
            "Qualifier": [
              "DirectionAngle.ElevationAngle",
              "Average"
            ],
            "FieldQuantity": "Magnetic"
          }
        },
        {
          "Name": "Field azimuth angle",
          "ParameterKey": "Column_8",
          "Description": "Azimuth angle of magnetic field vector",
          "Units": "Deg",
          "CoordinateSystem": {
            "CoordinateRepresentation": "Spherical",
            "CoordinateSystemName": "RTN"
          },
          "ValidMin": "0.",
          "ValidMax": "360.",
          "Field": {
            "Qualifier": [
              "DirectionAngle.AzimuthAngle",
              "Average"
            ],
            "FieldQuantity": "Magnetic"
          }
        },
        {
          "Name": "Br",
          "ParameterKey": "Column_9",
          "Description": "Radial component of vector magnetic field in RTN coordinates.",
          "Units": "nT",
          "CoordinateSystem": {
            "CoordinateRepresentation": "Cartesian",
            "CoordinateSystemName": "RTN"
          },
          "Field": {
            "Qualifier": [
              "Component.I",
              "Average"
            ],
            "FieldQuantity": "Magnetic"
          }
        },
        {
          "Name": "Bt",
          "ParameterKey": "Column_10",
          "Description": "Transverse component of vector magnetic field in RTN coordinates",
          "Units": "nT",
          "CoordinateSystem": {
            "CoordinateRepresentation": "Cartesian",
            "CoordinateSystemName": "RTN"
          },
          "Field": {
            "Qualifier": [
              "Component.J",
              "Average"
            ],
            "FieldQuantity": "Magnetic"
          }
        },
        {
          "Name": "Bn",
          "ParameterKey": "Column_11",
          "Description": "Normal component of vector magnetic field in RTN coordinates",
          "Units": "nT",
          "CoordinateSystem": {
            "CoordinateRepresentation": "Cartesian",
            "CoordinateSystemName": "RTN"
          },
          "Field": {
            "Qualifier": [
              "Component.K",
              "Average"
            ],
            "FieldQuantity": "Magnetic"
          }
        },
        {
          "Name": "dBr",
          "ParameterKey": "Column_12",
          "Description": "1-sigma uncertainty in the radial component of vector magnetic field in RTN coordinates.",
          "Units": "nT",
          "CoordinateSystem": {
            "CoordinateRepresentation": "Cartesian",
            "CoordinateSystemName": "RTN"
          },
          "Field": {
            "Qualifier": [
              "Component.I",
              "StandardDeviation"
            ],
            "FieldQuantity": "Magnetic"
          }
        },
        {
          "Name": "dBt",
          "ParameterKey": "Column_13",
          "Description": "1-sigma uncertainty in the transverse component of vector magnetic field in RTN coordinates",
          "Units": "nT",
          "CoordinateSystem": {
            "CoordinateRepresentation": "Cartesian",
            "CoordinateSystemName": "RTN"
          },
          "Field": {
            "Qualifier": [
              "Component.J",
              "StandardDeviation"
            ],
            "FieldQuantity": "Magnetic"
          }
        },
        {
          "Name": "dBn",
          "ParameterKey": "Column_14",
          "Description": "1-sigma uncertainty in the normal component of vector magnetic field in RTN coordinates",
          "Units": "nT",
          "UnitsConversion": "1e-9>T",
          "CoordinateSystem": {
            "CoordinateRepresentation": "Cartesian",
            "CoordinateSystemName": "RTN"
          },
          "Field": {
            "Qualifier": [
              "Component.K",
              "StandardDeviation"
            ],
            "FieldQuantity": "Magnetic"
          }
        },
        {
          "Name": "X",
          "ParameterKey": "Column_15",
          "Description": "X component of HGI spacecraft position vector.",
          "Units": "AU",
          "CoordinateSystem": {
            "CoordinateRepresentation": "Cartesian",
            "CoordinateSystemName": "HGI"
          },
          "Support": {
            "Qualifier": "Component.I",
            "SupportQuantity": "Positional"
          }
        },
        {
          "Name": "Y",
          "ParameterKey": "Column_16",
          "Description": "Y component of HGI spacecraft position vector.",
          "Units": "AU",
          "CoordinateSystem": {
            "CoordinateRepresentation": "Cartesian",
            "CoordinateSystemName": "HGI"
          },
          "Support": {
            "Qualifier": "Component.J",
            "SupportQuantity": "Positional"
          }
        },
        {
          "Name": "Z",
          "ParameterKey": "Column_17",
          "Description": "Z component of HGI spacecraft position vector.",
          "Units": "AU",
          "CoordinateSystem": {
            "CoordinateRepresentation": "Cartesian",
            "CoordinateSystemName": "HGI"
          },
          "Support": {
            "Qualifier": "Component.K",
            "SupportQuantity": "Positional"
          }
        },
        {
          "Name": "R",
          "ParameterKey": "Column_18",
          "Description": "Heliocentric radial distance of spacecraft.",
          "Units": "AU",
          "Support": {
            "SupportQuantity": "Positional"
          }
        }
      ]
    }
  }
}