{
  "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  https://www.spase-group.org/data/schema/spase-2_3_2.xsd",
    "Version": "2.3.2",
    "NumericalData": {
      "ResourceID": "spase://NASA/NumericalData/DE2/VEFI/AC/CDF/PT0.5S",
      "ResourceHeader": {
        "ResourceName": "DE 2 Vector Electric Field Instrument (VEFI) AC Electric Field Spectrometers, A, B, and C, all frequency channels, Spacecraft, SC, coordinates, PT0.5S Data",
        "ReleaseDate": "2021-04-27T15:38:11Z",
        "Description": "The Dynamics Explorer 2, DE 2, Vector Electric Field Instrument, VEFI, used flight-proven double-probe techniques with 20-m baselines to obtain measurements of DC electric fields. This electric field investigation had the following objectives:\n\n* 1) Obtain accurate and comprehensive triaxial DC electric field measurements at ionospheric altitudes in order to refine the basic spatial patterns\n* 2) Define the large-scale time history of these patterns\n* 3) Study the small-scale temporal and spatial variations within the overall patterns\n* 4) Study the degree to which and in what region the electric field projects to the equatorial plane\n* 5) Obtain measurements of extreme low frequency, ELF, and lower frequency irregular structures\n* 6) Perform numerous correlative studies\n\nThe VEFI instrument consisted of six cylindrical elements 11 m long and 28 mm in diameter. Each antenna was insulated from the plasma except for the outer 2 m. The baseline, or distance between the midpoints of these 2-m active elements, was 20 m. The antennas were interlocked along the edges to prevent oscillation and to increase their rigidity against drag forces. The antenna pair perpendicular to the orbit plane did not deploy.\n\nThe basic electronic system was very similar in concept to those used on IMP-8 and ISEE 1, but modified for a three-axis measurement on a nonspinning spacecraft. At the core of the system were the high-impedance 1.0E12 ohm preamplifiers whose outputs were accurately subtracted and digitized at 14-bit analog to digital, A/D, conversion for sensitivity to about 0.1 µV/m to maintain high resolution, for subsequent removal of the cross-product of the spacecraft velocity, Vsc, and magnetic field, B, vectors in data processing. This provided the basic DC measurement. Other circuitry was used to aid in interpreting the DC data and to measure rapid variations in the signals detected by the antennas. The planned DC electric field range was i±1 V/m, the planned resolution was 0.1 mV/m, and the variational electric field was measured from 4 Hz to 1024 Hz. The DC electric field was measured at 16 samples/s. The variational electric field was measured from 1 µV/m to 10 mV/m root mean square, RMS. Additional details are found in N.C. Maynard et al., Space Sci. Instrum., 5(4), 523, 1981.",
        "Acknowledgement": "Please acknowledge the Principal Investigator N.C. Maynard and R.F. Pfaff for use of the Data",
        "Contact": [
          {
            "PersonID": "spase://SMWG/Person/Nelson.C.Maynard",
            "Role": "PrincipalInvestigator"
          },
          {
            "PersonID": "spase://SMWG/Person/Robert.F.Pfaff",
            "Role": "PrincipalInvestigator"
          },
          {
            "PersonID": "spase://SMWG/Person/Robert.M.Candey",
            "Role": "MetadataContact"
          },
          {
            "PersonID": "spase://SMWG/Person/Lee.Frost.Bargatze",
            "Role": "MetadataContact"
          }
        ],
        "InformationURL": [
          {
            "Name": "Dynamics Explorer 2, DE 2, Vector Electric Field Instrument, VEFI, data readme text file, NASA GSFC",
            "URL": "https://spdf.gsfc.nasa.gov/pub/data/de/de2/electric_fields_vefi/00readme.txt",
            "Description": "Dynamics Explorer 2, DE 2, Vector Electric Field Instrument, VEFI, data readme text file, hosted by NASA GSFC",
            "Language": "en"
          },
          {
            "Name": "Dynamics Explorer 2, DE 2, Vector Electric Field Instrument, VEFI, instrument and data description, NASA GSFC",
            "URL": "https://spdf.gsfc.nasa.gov/pub/data/de/de2/electric_fields_vefi/VEFI_instrument_data.txt",
            "Description": "Dynamics Explorer 2, DE 2, Vector Electric Field Instrument, VEFI, instrument and data description, hosted by NASA GSFC",
            "Language": "en"
          },
          {
            "Name": "OMNIWeb FTP Browser access to Dynamics Explorer 2 Magnetic and Electric Field ASCII data, NASA GSFC",
            "URL": "https://omniweb.gsfc.nasa.gov/ftpbrowser/de2_mag.html",
            "Description": "OMNIWeb FTP Browser access to Dynamics Explorer 2 Magnetic and Electric Field ASCII data including plot, listing, and output file services, hosted by NASA GSFC",
            "Language": "en"
          },
          {
            "Name": "NSSDC Master Catalog, Dynamics Explorer 2, VEFI instrument",
            "URL": "https://nssdc.gsfc.nasa.gov/nmc/experiment/display.action?id=1981-070B-02",
            "Description": "General information concerning the Dynamics Explorer 2, Vector Electric Field Instrument, VEFI, instrument",
            "Language": "en"
          }
        ],
        "PriorID": "spase://VSPO/NumericalData/DE2/VEFI/AC/CDF/PT0.5S"
      },
      "AccessInformation": [
        {
          "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/de/de2/electric_fields_vefi/ac500ms_vefi_cdaweb/",
              "Description": "Access to Data in CDF Format via ftp from SPDF"
            },
            {
              "Name": "HTTPS from SPDF",
              "URL": "https://spdf.gsfc.nasa.gov/pub/data/de/de2/electric_fields_vefi/ac500ms_vefi_cdaweb/",
              "Description": "Access to Data in CDF Format via http from SPDF"
            },
            {
              "Name": "CDAWeb",
              "URL": "https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=DE2_AC500MS_VEFI&index=sp_phys",
              "ProductKey": "DE2_AC500MS_VEFI",
              "Description": "Access to ASCII, CDF, and Plots via NASA/GSFC CDAWeb"
            }
          ],
          "Format": "CDF",
          "Encoding": "None",
          "Acknowledgement": "Please acknowledge the Principal Investigator N.C. Maynard and R.F. Pfaff. Please acknowledge the Data Providers and CDAWeb when using these Data."
        },
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
          "Availability": "Online",
          "AccessRights": "Open",
          "AccessURL": {
            "Name": "CDAWeb HAPI Server",
            "URL": "https://cdaweb.gsfc.nasa.gov/hapi",
            "Style": "HAPI",
            "ProductKey": "DE2_AC500MS_VEFI",
            "Description": "Web Service to this product using the HAPI interface."
          },
          "Format": "CSV",
          "Acknowledgement": "Please acknowledge the Principal Investigator N.C. Maynard and R.F. Pfaff. Please acknowledge the Data Providers and CDAWeb when using these Data."
        }
      ],
      "ProcessingLevel": "Calibrated",
      "InstrumentID": "spase://SMWG/Instrument/DynamicsExplorer2/VEFI",
      "MeasurementType": [
        "ElectricField",
        "Ephemeris",
        "InstrumentStatus"
      ],
      "TemporalDescription": {
        "TimeSpan": {
          "StartDate": "9999-01-01T00:00:00.000",
          "StopDate": "9999-12-31T23:59:59.999"
        },
        "Cadence": "PT0.5S"
      },
      "ObservedRegion": [
        "Earth.Magnetosphere",
        "Earth.Magnetosphere.Polar",
        "Earth.NearSurface",
        "Earth.NearSurface.AuroralRegion",
        "Earth.NearSurface.EquatorialRegion",
        "Earth.NearSurface.Ionosphere",
        "Earth.NearSurface.PolarCap"
      ],
      "Parameter": [
        {
          "Name": "Epoch Time",
          "ParameterKey": "Epoch",
          "Description": "Epoch Time Tags, time elapsed since 0 A.D., NSSDC standard-reference time value",
          "Caveats": "Average Type: standard This Parameter exhibits an increasing Monotonic Progression.",
          "Cadence": "PT0.5S",
          "Units": "ms",
          "UnitsConversion": "1.0e-3>s",
          "RenderingHints": {
            "DisplayType": "TimeSeries",
            "ValueFormat": "F14.0",
            "ScaleMin": "6.2536662219904e+13",
            "ScaleMax": "6.2834069019904e+13"
          },
          "ValidMin": "15-Sep-1981 00:00:00.000",
          "ValidMax": "18-Feb-1991 23:59:59.999",
          "FillValue": "31-Dec-9999 23:59:59.999",
          "Support": {
            "SupportQuantity": "Temporal"
          }
        },
        {
          "Name": "Orbit Number",
          "Set": "Time series defined by using: EPOCH",
          "ParameterKey": "orbitNumber",
          "Description": "Orbit Number",
          "Cadence": "PT0.5S",
          "RenderingHints": {
            "DisplayType": "TimeSeries",
            "AxisLabel": "orbit number",
            "ValueFormat": "I4"
          },
          "ValidMin": "1",
          "ValidMax": "8577",
          "FillValue": "999",
          "Support": {
            "SupportQuantity": "Other"
          }
        },
        {
          "Name": "Spectrometer A, AC Electric Field",
          "Set": "Time series defined by using: EPOCH",
          "ParameterKey": "spectA",
          "Description": "Spectrometer A, AC Electric Field, eight frequencies",
          "Cadence": "PT0.5S",
          "Units": "µV/m",
          "UnitsConversion": "1.0e-6>V/m",
          "RenderingHints": {
            "AxisLabel": "AC Spect A",
            "ValueFormat": "F7.2",
            "ScaleType": "LogScale"
          },
          "Structure": {
            "Size": "8",
            "Element": [
              {
                "Name": "Element 1",
                "Index": "1",
                "RenderingHints": {
                  "AxisLabel": "1"
                }
              },
              {
                "Name": "Element 2",
                "Index": "2",
                "RenderingHints": {
                  "AxisLabel": "2"
                }
              },
              {
                "Name": "Element 3",
                "Index": "3",
                "RenderingHints": {
                  "AxisLabel": "3"
                }
              },
              {
                "Name": "Element 4",
                "Index": "4",
                "RenderingHints": {
                  "AxisLabel": "4"
                }
              },
              {
                "Name": "Element 5",
                "Index": "5",
                "RenderingHints": {
                  "AxisLabel": "5"
                }
              },
              {
                "Name": "Element 6",
                "Index": "6",
                "RenderingHints": {
                  "AxisLabel": "6"
                }
              },
              {
                "Name": "Element 7",
                "Index": "7",
                "RenderingHints": {
                  "AxisLabel": "7"
                }
              },
              {
                "Name": "Element 8",
                "Index": "8",
                "RenderingHints": {
                  "AxisLabel": "8"
                }
              }
            ]
          },
          "ValidMin": "0.0",
          "ValidMax": "9999.98",
          "FillValue": "9999.99",
          "Field": {
            "Qualifier": "Array",
            "FieldQuantity": "Electric"
          }
        },
        {
          "Name": "Spectrometer B, AC Electric Field",
          "Set": "Time series defined by using: EPOCH",
          "ParameterKey": "spectB",
          "Description": "Spectrometer B, AC Electric Field, eight frequencies",
          "Cadence": "PT0.5S",
          "Units": "µV/m",
          "UnitsConversion": "1.0e-6>V/m",
          "RenderingHints": {
            "AxisLabel": "AC Spect B",
            "ValueFormat": "F7.2",
            "ScaleType": "LogScale"
          },
          "Structure": {
            "Size": "8",
            "Element": [
              {
                "Name": "Element 1",
                "Index": "1",
                "RenderingHints": {
                  "AxisLabel": "1"
                }
              },
              {
                "Name": "Element 2",
                "Index": "2",
                "RenderingHints": {
                  "AxisLabel": "2"
                }
              },
              {
                "Name": "Element 3",
                "Index": "3",
                "RenderingHints": {
                  "AxisLabel": "3"
                }
              },
              {
                "Name": "Element 4",
                "Index": "4",
                "RenderingHints": {
                  "AxisLabel": "4"
                }
              },
              {
                "Name": "Element 5",
                "Index": "5",
                "RenderingHints": {
                  "AxisLabel": "5"
                }
              },
              {
                "Name": "Element 6",
                "Index": "6",
                "RenderingHints": {
                  "AxisLabel": "6"
                }
              },
              {
                "Name": "Element 7",
                "Index": "7",
                "RenderingHints": {
                  "AxisLabel": "7"
                }
              },
              {
                "Name": "Element 8",
                "Index": "8",
                "RenderingHints": {
                  "AxisLabel": "8"
                }
              }
            ]
          },
          "ValidMin": "0.0",
          "ValidMax": "9999.98",
          "FillValue": "9999.99",
          "Field": {
            "Qualifier": "Array",
            "FieldQuantity": "Electric"
          }
        },
        {
          "Name": "Spectrometer C, AC Electric Field",
          "Set": "Time series defined by using: EPOCH",
          "ParameterKey": "spectC",
          "Description": "Spectrometer C, AC Electric Field, four frequencies",
          "Cadence": "PT0.5S",
          "Units": "µV/m",
          "UnitsConversion": "1.0e-6>V/m",
          "RenderingHints": {
            "AxisLabel": "AC Spect C",
            "ValueFormat": "F7.2",
            "ScaleType": "LogScale"
          },
          "Structure": {
            "Size": "4",
            "Element": [
              {
                "Name": "Element 1",
                "Index": "1",
                "RenderingHints": {
                  "AxisLabel": "1"
                }
              },
              {
                "Name": "Element 2",
                "Index": "2",
                "RenderingHints": {
                  "AxisLabel": "2"
                }
              },
              {
                "Name": "Element 3",
                "Index": "3",
                "RenderingHints": {
                  "AxisLabel": "3"
                }
              },
              {
                "Name": "Element 4",
                "Index": "4",
                "RenderingHints": {
                  "AxisLabel": "4"
                }
              }
            ]
          },
          "ValidMin": "0.0",
          "ValidMax": "9999.98",
          "FillValue": "9999.99",
          "Field": {
            "Qualifier": "Array",
            "FieldQuantity": "Electric"
          }
        },
        {
          "Name": "Spectrometer A Connection Flag",
          "Set": "Time series defined by using: EPOCH",
          "ParameterKey": "spectAconnection",
          "Description": "Spectrometer A Connection Flag (X,Y,Z)",
          "Cadence": "PT0.5S",
          "RenderingHints": {
            "DisplayType": "TimeSeries",
            "AxisLabel": "spect A connect",
            "ValueFormat": "A1"
          },
          "Support": {
            "Qualifier": "Scalar",
            "SupportQuantity": "InstrumentMode"
          }
        },
        {
          "Name": "Spectrometer B Connection Flag",
          "Set": "Time series defined by using: EPOCH",
          "ParameterKey": "spectBconnection",
          "Description": "Spectrometer B Connection Flag (X,Y,Z)",
          "Cadence": "PT0.5S",
          "RenderingHints": {
            "DisplayType": "TimeSeries",
            "AxisLabel": "spect B connect",
            "ValueFormat": "A1"
          },
          "Support": {
            "Qualifier": "Scalar",
            "SupportQuantity": "InstrumentMode"
          }
        },
        {
          "Name": "Spectrometer C Connection Flag",
          "Set": "Time series defined by using: EPOCH",
          "ParameterKey": "spectCconnection",
          "Description": "Spectrometer C Connection Flag (X,Y,Z)",
          "Cadence": "PT0.5S",
          "RenderingHints": {
            "DisplayType": "TimeSeries",
            "AxisLabel": "spect C connect",
            "ValueFormat": "A1"
          },
          "Support": {
            "Qualifier": "Scalar",
            "SupportQuantity": "InstrumentMode"
          }
        },
        {
          "Name": "Spectrometer A Gain",
          "Set": "Time series defined by using: EPOCH",
          "ParameterKey": "spectAgain",
          "Description": "Spectrometer A Gain (H,L)",
          "Cadence": "PT0.5S",
          "RenderingHints": {
            "DisplayType": "TimeSeries",
            "AxisLabel": "spect A gain",
            "ValueFormat": "A1"
          },
          "Support": {
            "Qualifier": "Scalar",
            "SupportQuantity": "InstrumentMode"
          }
        },
        {
          "Name": "Spectrometer B Gain",
          "Set": "Time series defined by using: EPOCH",
          "ParameterKey": "spectBgain",
          "Description": "Spectrometer B Gain (H,L)",
          "Cadence": "PT0.5S",
          "RenderingHints": {
            "DisplayType": "TimeSeries",
            "AxisLabel": "spect B gain",
            "ValueFormat": "A1"
          },
          "Support": {
            "Qualifier": "Scalar",
            "SupportQuantity": "InstrumentMode"
          }
        },
        {
          "Name": "Spectrometer C Gain",
          "Set": "Time series defined by using: EPOCH",
          "ParameterKey": "spectCgain",
          "Description": "Spectrometer C Gain (H,L)",
          "Cadence": "PT0.5S",
          "RenderingHints": {
            "DisplayType": "TimeSeries",
            "AxisLabel": "spect C gain",
            "ValueFormat": "A1"
          },
          "Support": {
            "Qualifier": "Scalar",
            "SupportQuantity": "InstrumentMode"
          }
        },
        {
          "Name": "Spacecraft Position, Latitude, Geographic spherical coordinates",
          "Set": "Time series defined by using: EPOCH",
          "ParameterKey": "glat",
          "Description": "Spacecraft Position, Latitude, Geographic, GEO, spherical coordinates",
          "Cadence": "PT0.5S",
          "Units": "°",
          "UnitsConversion": "0.0174532925>rad",
          "CoordinateSystem": {
            "CoordinateRepresentation": "Spherical",
            "CoordinateSystemName": "GEO"
          },
          "RenderingHints": {
            "DisplayType": "TimeSeries",
            "AxisLabel": "Geog Latitude",
            "ValueFormat": "F7.2"
          },
          "ValidMin": "-90.0",
          "ValidMax": "90.0",
          "FillValue": "9999.99",
          "Support": {
            "Qualifier": "DirectionAngle.ElevationAngle",
            "SupportQuantity": "Positional"
          }
        },
        {
          "Name": "Spacecraft Position, Longitude, Geographic spherical coordinates",
          "Set": "Time series defined by using: EPOCH",
          "ParameterKey": "glon",
          "Description": "Spacecraft Position, Longitude, Geographic, GEO, spherical coordinates",
          "Cadence": "PT0.5S",
          "Units": "°",
          "UnitsConversion": "0.0174532925>rad",
          "CoordinateSystem": {
            "CoordinateRepresentation": "Spherical",
            "CoordinateSystemName": "GEO"
          },
          "RenderingHints": {
            "DisplayType": "TimeSeries",
            "AxisLabel": "Geog Longitude",
            "ValueFormat": "F7.2"
          },
          "ValidMin": "-180.0",
          "ValidMax": "180.0",
          "FillValue": "9999.99",
          "Support": {
            "Qualifier": "DirectionAngle.AzimuthAngle",
            "SupportQuantity": "Positional"
          }
        },
        {
          "Name": "Spacecraft Position, Invariant Latitude",
          "Set": "Time series defined by using: EPOCH",
          "ParameterKey": "ilat",
          "Description": "Spacecraft Position, Invariant Latitude",
          "Cadence": "PT0.5S",
          "Units": "°",
          "UnitsConversion": "0.0174532925>rad",
          "CoordinateSystem": {
            "CoordinateRepresentation": "Spherical",
            "CoordinateSystemName": "MAG"
          },
          "RenderingHints": {
            "DisplayType": "TimeSeries",
            "AxisLabel": "Inv Lat",
            "ValueFormat": "F7.2"
          },
          "ValidMin": "-90.0",
          "ValidMax": "90.0",
          "FillValue": "9999.99",
          "Support": {
            "Qualifier": "DirectionAngle.ElevationAngle",
            "SupportQuantity": "Positional"
          }
        },
        {
          "Name": "Spacecraft Position, Magnetic Local Time",
          "Set": "Time series defined by using: EPOCH",
          "ParameterKey": "mlt",
          "Description": "Spacecraft Position, Magnetic Local Time, MLT",
          "Cadence": "PT0.5S",
          "Units": "h",
          "UnitsConversion": "3600>s",
          "CoordinateSystem": {
            "CoordinateRepresentation": "Spherical",
            "CoordinateSystemName": "MAG"
          },
          "RenderingHints": {
            "DisplayType": "TimeSeries",
            "AxisLabel": "MLT",
            "ValueFormat": "F7.2"
          },
          "ValidMin": "0.0",
          "ValidMax": "24.0",
          "FillValue": "9999.99",
          "Support": {
            "Qualifier": "DirectionAngle.AzimuthAngle",
            "SupportQuantity": "Positional"
          }
        },
        {
          "Name": "Spacecraft Position, Altitude",
          "Set": "Time series defined by using: EPOCH",
          "ParameterKey": "alt",
          "Description": "Spacecraft Position, Altitude",
          "Cadence": "PT0.5S",
          "Units": "km",
          "UnitsConversion": "1.0e3>m",
          "RenderingHints": {
            "DisplayType": "TimeSeries",
            "AxisLabel": "Altitude",
            "ValueFormat": "F7.2"
          },
          "ValidMin": "0.0",
          "ValidMax": "10000.0",
          "FillValue": "9999.99",
          "Support": {
            "Qualifier": [
              "Magnitude",
              "Scalar"
            ],
            "SupportQuantity": "Positional"
          }
        },
        {
          "Name": "Indices for Spectrometer A and Spectrometer B Energy Channels",
          "ParameterKey": "index8",
          "Description": "Indices for Spectrometer A and Spectrometer B Energy Channels",
          "Cadence": "PT0.5S",
          "RenderingHints": {
            "AxisLabel": "channel"
          },
          "Structure": {
            "Size": "8"
          },
          "ValidMin": "1",
          "ValidMax": "4",
          "Support": {
            "SupportQuantity": "Other"
          }
        },
        {
          "Name": "Indices for Spectrometer C Energy Channels",
          "ParameterKey": "index4",
          "Description": "Indices for Spectrometer C Energy Channels",
          "Cadence": "PT0.5S",
          "RenderingHints": {
            "AxisLabel": "channel"
          },
          "Structure": {
            "Size": "4"
          },
          "ValidMin": "1",
          "ValidMax": "4",
          "Support": {
            "SupportQuantity": "Other"
          }
        }
      ]
    }
  }
}