{
  "Spase": {
    "xmlns": "http://www.spase-group.org/data/schema",
    "xmlns:xsi": "http://www.w3.org/2001/XMLSchema-instance",
    "xsi:schemaLocation": "https://www.spase-group.org/data/schema https://www.spase-group.org/data/schema/spase-2.7.1.xsd",
    "Version": "2.7.1",
    "MetadataRightsList": {
      "Rights": {
        "SchemeURI": "https://spdx.org/licenses/",
        "RightsIdentifierScheme": "SPDX",
        "RightsIdentifier": "CC0-1.0",
        "RightsURI": "https://spdx.org/licenses/CC0-1.0.html",
        "RightsName": "Creative Commons Zero v1.0 Universal",
        "Note": "CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions"
      }
    },
    "NumericalData": {
      "ResourceID": "spase://NASA/NumericalData/ELFIN/A/Ephemeris/PRED/PT1S",
      "NamingAuthority": "NASA",
      "ResourceType": "Instrument",
      "ResourceHeader": {
        "ResourceName": "ELFIN-A Predicted Ephemeris Data",
        "DOI": "https://doi.org/10.48322/qmsd-zf76",
        "ReleaseDate": "2025-12-12T19:37:22Z",
        "RevisionHistory": {
          "RevisionEvent": [
            {
              "ReleaseDate": "2024-06-28T12:34:56.789",
              "Note": "Only known prior ReleaseDate of the metadata"
            },
            {
              "ReleaseDate": "2025-03-03T13:45:36Z",
              "Note": "Modified Funding AwardNumber. ZCB"
            },
            {
              "ReleaseDate": "2025-04-21T13:45:36Z",
              "Note": "Fixed Instrument link. JMW"
            },
            {
              "ReleaseDate": "2025-10-02T15:11:50Z",
              "Note": "Updated PublishedBy name to match ROR Registry. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. ZCB"
            },
            {
              "ReleaseDate": "2025-10-29T14:23:50Z",
              "Note": "Added DOI TLK"
            },
            {
              "ReleaseDate": "2025-12-04T13:29:11Z",
              "Note": "Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB"
            },
            {
              "ReleaseDate": "2025-12-12T19:37:22Z",
              "Note": "made a small change to product key TLK"
            }
          ]
        },
        "Description": "The Electron Losses and Fields Investigation (ELFIN) mission is a space weather mission using three scientific instruments in a 3U+ CubeSat. The instruments measure wave and particle data. These ELFIN-A state files contain predicted position, attitude and orbit events.",
        "Acknowledgement": "Please acknowledge the Principal Investigator, V. Angelopoulos, NASA, and NSF for providing the Data. Open Data for Scientific Use.",
        "PublicationInfo": {
          "Authors": "Angelopoulos, V., Russell, C., Wu, J., Wilkins, C., Caron, R., Tsai, E., King, J., and Norris, A.",
          "PublicationDate": "2024-06-19T12:34:56.789Z",
          "PublishedBy": "Space Physics Data Facility"
        },
        "Funding": [
          {
            "Agency": "NASA",
            "Project": "ELFIN funding",
            "AwardNumber": "NNX14AN68G"
          },
          {
            "Agency": "NSF",
            "Project": "ELFIN funding",
            "AwardNumber": "AGS-1242918"
          },
          {
            "Agency": "NSF",
            "Project": "ELFIN funding",
            "AwardNumber": "AGS-2019950"
          }
        ],
        "Contact": [
          {
            "PersonID": "spase://SMWG/Person/Vassilis.Angelopoulos",
            "Role": "PrincipalInvestigator"
          },
          {
            "PersonID": "spase://SMWG/Person/Cindy.Russell",
            "Role": "Scientist"
          },
          {
            "PersonID": "spase://SMWG/Person/Jiashu.Wu",
            "Role": "Scientist"
          },
          {
            "PersonID": "spase://SMWG/Person/Colin.Wilkins",
            "Role": "TechnicalContact"
          },
          {
            "PersonID": "spase://SMWG/Person/Ryan.Caron",
            "Role": "TechnicalContact"
          },
          {
            "PersonID": "spase://SMWG/Person/Ethan.Tsai",
            "Role": "ProjectManager"
          },
          {
            "PersonID": "spase://SMWG/Person/James.King",
            "Role": "DataProducer"
          },
          {
            "PersonID": "spase://SMWG/Person/Austin.Norris",
            "Role": "DataProducer"
          },
          {
            "PersonID": "spase://SMWG/Person/Robert.M.Candey",
            "Role": "MetadataContact"
          },
          {
            "PersonID": "spase://SMWG/Person/Lee.Frost.Bargatze",
            "Role": "MetadataContact"
          },
          {
            "PersonID": "spase://SMWG/Person/James.M.Weygand",
            "Role": "MetadataContact"
          }
        ],
        "InformationURL": {
          "Name": "Electron Losses and Fields INvestigation-A state file",
          "URL": "https://elfin.igpp.ucla.edu",
          "Description": "Electron Losses and Fields INvestigation-A twin satellite mission University of California, Los Angeles homepage.",
          "Language": "en"
        }
      },
      "AccessInformation": {
        "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF",
        "Availability": "Online",
        "AccessRights": "Open",
        "RightsList": {
          "Rights": {
            "SchemeURI": "https://spdx.org/licenses/",
            "RightsIdentifierScheme": "SPDX",
            "RightsIdentifier": "CC0-1.0",
            "RightsURI": "https://spdx.org/licenses/CC0-1.0.html",
            "RightsName": "Creative Commons Zero v1.0 Universal",
            "Note": "CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products"
          }
        },
        "AccessURL": [
          {
            "Name": "HTTPS from SPDF",
            "URL": "https://spdf.gsfc.nasa.gov/pub/data/elfin/elfina/ephemeris/pred/",
            "Description": "Access to Data in CDF Format via https from SPDF"
          },
          {
            "Name": "CDAWeb",
            "URL": "https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=ELA_l1_STATE_PRED&index=sp_phys",
            "ProductKey": "ELA_L1_STATE_PRED",
            "Description": "Access to ASCII, CDF, and Plots via NASA/GSFC CDAWeb"
          }
        ],
        "Format": "CDF",
        "Encoding": "None",
        "Acknowledgement": "Please acknowledge the Principal Investigator, V. Angelopoulos, NASA, and NSF. Please acknowledge the Data Providers and CDAWeb when using these Data."
      },
      "ProcessingLevel": "Calibrated",
      "InstrumentID": "spase://NASA/Instrument/ELFIN/A/Ephemeris",
      "MeasurementType": "InstrumentStatus",
      "TemporalDescription": {
        "TimeSpan": {
          "StartDate": "2018-09-17T00:00:00.000",
          "StopDate": "2023-01-01T23:59:59.999"
        },
        "Cadence": "PT1S"
      },
      "ObservedRegion": [
        "Earth.Magnetosphere",
        "Earth.Magnetosphere.Polar",
        "Earth.NearSurface",
        "Earth.NearSurface.AuroralRegion",
        "Earth.NearSurface.Atmosphere",
        "Earth.NearSurface.Ionosphere",
        "Earth.NearSurface.PolarCap"
      ],
      "Parameter": [
        {
          "Name": "Time since Jan 1, 2000",
          "ParameterKey": "ela_state_time",
          "Description": "Coordinated universal time (UTC) in seconds.",
          "Caveats": "Unleaped seconds",
          "Cadence": "PT1S",
          "Units": "s",
          "RenderingHints": {
            "AxisLabel": "ela_state_time",
            "ValueFormat": "E12.2",
            "ScaleType": "LinearScale"
          },
          "ValidMin": "2010-01-01T00:00:00.000000000",
          "ValidMax": "2029-12-31T23:59:58.999000000",
          "FillValue": "9999-12-31T23:59:59.999999999",
          "Support": {
            "SupportQuantity": "Temporal"
          }
        },
        {
          "Name": "Position XYZ",
          "Set": "Time series defined by using: ela_state_time",
          "ParameterKey": "ela_pos_gei",
          "Description": "Spacecraft Position XYZ in GEI-J2000",
          "Cadence": "PT1S",
          "Units": "km",
          "CoordinateSystem": {
            "CoordinateRepresentation": "Cartesian",
            "CoordinateSystemName": "GEI"
          },
          "Support": {
            "Qualifier": "Vector",
            "SupportQuantity": "Positional"
          }
        },
        {
          "Name": "Velocity",
          "Set": "Time series defined by using: ela_state_time",
          "ParameterKey": "ela_vel_gei",
          "Description": "Spacecraft Velocity Vxyz",
          "Cadence": "PT1S",
          "Units": "km/s",
          "CoordinateSystem": {
            "CoordinateRepresentation": "Cartesian",
            "CoordinateSystemName": "GEI"
          },
          "Support": {
            "Qualifier": "Vector",
            "SupportQuantity": "Velocity"
          }
        },
        {
          "Name": "Time since Jan 1, 2000",
          "ParameterKey": "ela_att_time",
          "Description": "Attitude time, UTC, in seconds.",
          "Caveats": "Unleaped seconds",
          "Cadence": "PT60S",
          "Units": "s",
          "RenderingHints": {
            "AxisLabel": "ela_att_time",
            "ValueFormat": "E12.2",
            "ScaleType": "LinearScale"
          },
          "ValidMin": "2010-01-01T00:00:00.000000000",
          "ValidMax": "2029-12-31T23:59:58.999000000",
          "FillValue": "9999-12-31T23:59:59.999999999",
          "Support": {
            "SupportQuantity": "Temporal"
          }
        },
        {
          "Name": "Attitude XYZ",
          "Set": "Time series defined by using: ela_att_time",
          "ParameterKey": "ela_att_gei",
          "Description": "Spacecraft Attitude XYZ",
          "Cadence": "PT60S",
          "Units": "km",
          "CoordinateSystem": {
            "CoordinateRepresentation": "Cartesian",
            "CoordinateSystemName": "GEI"
          },
          "Support": {
            "Qualifier": "Vector",
            "SupportQuantity": "Positional"
          }
        },
        {
          "Name": "Time since Jan 1, 2000",
          "Set": "Time series defined by using: ela_att_time",
          "ParameterKey": "ela_att_solution_date",
          "Description": "Date of attitude solution, UTC, in seconds",
          "Cadence": "PT60S",
          "Units": "s",
          "RenderingHints": {
            "AxisLabel": "att_solution_date",
            "ValueFormat": "E12.2"
          },
          "ValidMin": "2010-01-01T00:00:00.000000000",
          "ValidMax": "2029-12-31T23:59:58.999000000",
          "FillValue": "9999-12-31T23:59:59.999999999",
          "Support": {
            "SupportQuantity": "Temporal"
          }
        },
        {
          "Name": "ela_att_uncertainty",
          "Set": "Time series defined by using: ela_att_time",
          "ParameterKey": "ela_att_uncertainty",
          "Description": "Uncertainty of att",
          "Cadence": "PT60S",
          "Units": "°",
          "RenderingHints": {
            "AxisLabel": "att_uncertainty",
            "ValueFormat": "F12.8"
          },
          "ValidMin": "0.0",
          "ValidMax": "360.0",
          "FillValue": "NaN",
          "Support": {
            "SupportQuantity": "Housekeeping"
          }
        },
        {
          "Name": "Attitude Flag",
          "Set": "Time series defined by using: ela_att_time",
          "ParameterKey": "ela_att_flag",
          "Description": "Flag indicating if the attitude is interpolated=0, modeled=1.",
          "Cadence": "PT60S",
          "RenderingHints": {
            "AxisLabel": "attitude flag",
            "ValueFormat": "i1"
          },
          "ValidMin": "0",
          "ValidMax": "1",
          "FillValue": "-1",
          "Support": {
            "SupportQuantity": "Housekeeping"
          }
        },
        {
          "Name": "Calculated Spin Period",
          "Set": "Time series defined by using: ela_att_time",
          "ParameterKey": "ela_att_spinper",
          "Description": "Calculated spin period.",
          "Cadence": "PT60S",
          "Units": "sec",
          "RenderingHints": {
            "AxisLabel": "spinper",
            "ValueFormat": "F12.8"
          },
          "ValidMin": "0",
          "ValidMax": "40",
          "FillValue": "-128",
          "Support": {
            "SupportQuantity": "Housekeeping"
          }
        },
        {
          "Name": "ela_spin_orbnorm_angle",
          "Set": "Time series defined by using: ela_att_time",
          "ParameterKey": "ela_spin_orbnorm_angle",
          "Description": "Angle between spin vector and orbit normal.",
          "Cadence": "PT160S",
          "Units": "°",
          "RenderingHints": {
            "AxisLabel": "spin_orbnorm_angle",
            "ValueFormat": "F12.8"
          },
          "ValidMin": "0.0",
          "ValidMax": "360.0",
          "FillValue": "NaN",
          "Support": {
            "SupportQuantity": "Orientation"
          }
        },
        {
          "Name": "ela_spin_sun_angle",
          "Set": "Time series defined by using: ela_att_time",
          "ParameterKey": "ela_spin_sun_angle",
          "Description": "Angle between spin vector and sun.",
          "Cadence": "PT60S",
          "Units": "°",
          "RenderingHints": {
            "AxisLabel": "spin_sun_angle",
            "ValueFormat": "F12.8"
          },
          "ValidMin": "0.0",
          "ValidMax": "360.0",
          "FillValue": "NaN",
          "Support": {
            "SupportQuantity": "Orientation"
          }
        },
        {
          "Name": "ELFIN A Sun Flag",
          "Set": "Time series defined by using: ela_state_time",
          "ParameterKey": "ela_sun",
          "Description": "ELFIN A sun flag. Spacecraft in sun = 1.",
          "Cadence": "PT1S",
          "RenderingHints": {
            "AxisLabel": "spacecraft in sun",
            "ValueFormat": "I1"
          },
          "ValidMin": "0.0",
          "ValidMax": "1.0",
          "FillValue": "NaN",
          "Support": {
            "SupportQuantity": "Housekeeping"
          }
        }
      ]
    }
  }
}