{
  "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",
    "NumericalData": {
      "ResourceID": "spase://NASA/NumericalData/TRACERS/TRACERS2/Level2/AnalyzerCuspElectrons/DEF/Variable",
      "NamingAuthority": "NASA",
      "ResourceType": "NumericalData",
      "ResourceHeader": {
        "ResourceName": "TRACERS 2 Analyzer of Cusp Electrons (ACE) Differential Energy Flux and Counts, Level 2 (L2), Data",
        "DOI": "https://doi.org/10.48322/vfwx-4a76",
        "ReleaseDate": "2026-04-30T14:30:23Z",
        "RevisionHistory": {
          "RevisionEvent": [
            {
              "ReleaseDate": "2026-04-28T12:34:56.789",
              "Note": "Initial release of metadata, ADAPT generated, SAB"
            },
            {
              "ReleaseDate": "2026-04-30T14:30:23Z",
              "Note": "Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. Matched version number in schemaLocation attribute to updated value in Version tag. Added DOI. tlk"
            }
          ]
        },
        "Description": "The ACE L2 data consist of raw measured counts and calibrated differential energy fluxes as a function of anode angle and calibrated energy. Counts are accumulated in 21 discrete anodes with different viewing angles for each of 49 energy steps, with a basic measurement cadence of 50 ms. Counts are converted to differential energy flux by subtracting an estimate of the background and then dividing by the instrument calibration matrix. The estimated background count rates and calibration matrix are included in the L2 data files, enabling application of alternative background subtraction methods or calibrations.  Background estimates include two sources: 1) Instrumental background due to electronics crosstalk, which is constant across all anodes but varies with energy. 2) Natural background due to penetrating energetic particles and natural radioactivity in the microchannel plate detectors, which is constant across all anodes and energies. Subtraction of background can lead to negative differential energy fluxes, especially for low count rate data. Depending on the use case, these negative values can either be retained or replaced with zeroes.  The calibration matrix incorporates instrument sensitivity and relative sensitivity factors for each anode, both estimated based upon a combination of pre-flight laboratory calibrations and inflight data. Energy values for each energy step and anode are computed utilizing the known sweep voltage table and pre-flight laboratory calibrations.  The ACE instrument was intended to be operated in a particular spacecraft orientation, with the TSCS +Z axis aligned with the magnetic field. In this orientation, incoming electron trajectories are not occluded by the spacecraft. However, for a portion of the TRACERS mission, the spacecraft are oriented in the opposite sense, which leads to an occlusion of a portion of the instrument field of view by the spacecraft body for low-energy (<~200 eV) electrons. Low-energy ACE data should not be utilized for quantitative purposes when the spacecraft are in this orientation.",
        "Acknowledgement": "Jasper Halekas See the rules of use available at https://tracers.physics.uiowa.edu/rules-use.",
        "PublicationInfo": {
          "Authors": "Halekas, Jasper, S.; Christopher, Ivar, W.; Miles, David, M.",
          "PublicationDate": "2026-04-03T00:00:00Z",
          "PublishedBy": "Space Physics Data Facility"
        },
        "Contact": [
          {
            "PersonID": "spase://SMWG/Person/Jasper.S.Halekas",
            "Role": [
              "InstrumentLead",
              "CoInvestigator"
            ]
          },
          {
            "PersonID": "spase://SMWG/Person/David.M.Miles",
            "Role": "PrincipalInvestigator"
          },
          {
            "PersonID": "spase://SMWG/Person/TRACERS_SOC",
            "Role": "HostContact"
          },
          {
            "PersonID": "spase://SMWG/Person/Lan.Jian",
            "Role": "MetadataContact"
          },
          {
            "PersonID": "spase://SMWG/Person/Scott.Boardsen",
            "Role": "MetadataContact"
          }
        ],
        "InformationURL": [
          {
            "Name": "TRACERS",
            "URL": "https://tracers.physics.uiowa.edu/",
            "Description": "TRACERS data",
            "Language": "en"
          },
          {
            "Name": "Instrument Paper for Analyzer of Cusp Electrons (ACE)",
            "URL": "https://doi.org/10.1007/s11214-025-01147-9",
            "Description": "Electron measurements from 20 eV to 13.5 keV, with angular resolution of 10x7 degrees, cadence of 50 ms to provide sub-kilometer resolution in the cusp in region of interest (ROI) and 6.4 s in back orbit (BOR)."
          }
        ]
      },
      "AccessInformation": [
        {
          "RepositoryID": "spase://SMWG/Repository/TRACERS_PDP",
          "Availability": "Online",
          "AccessRights": "Open",
          "AccessURL": {
            "Name": "HTTPS from the TRACERS SDC",
            "URL": "https://tracers.physics.uiowa.edu/l2-public-data-products",
            "Description": "In CDF via http from the TRACERS Science Data Center"
          },
          "Format": "CDF",
          "Encoding": "None",
          "Acknowledgement": "Please Acknowlege the TRACRES TEAM, for rules of use https:/tracers.physics.uiowa.edu/rules-use"
        },
        {
          "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb",
          "Availability": "Online",
          "AccessRights": "Open",
          "AccessURL": [
            {
              "Name": "FTPS from SPDF (not with most browsers)",
              "URL": "ftps://spdf.gsfc.nasa.gov/pub/data/tracers/tracers2/ace_cusp-electrons/l2/def_diff-en-flux",
              "ProductKey": "TS2_L2_ACE_DEF",
              "Description": "Access to Data in CDF Format via ftps from SPDF"
            },
            {
              "Name": "HTTPS from SPDF",
              "URL": "https://cdaweb.gsfc.nasa.gov/pub/data/tracers/tracers2/ace_cusp-electrons/l2/def_diff-en-flux",
              "ProductKey": "TS2_L2_ACE_DEF",
              "Description": "Access to Data in CDF Format via https from SPDF"
            },
            {
              "Name": "CDAWeb",
              "URL": "https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=TS2_L2_ACE_DEF&index=sp_phys",
              "ProductKey": "TS2_L2_ACE_DEF",
              "Description": "Access to ASCII, CDF, and Plots via NASA/GSFC CDAWeb"
            }
          ],
          "Format": "CDF",
          "Encoding": "None",
          "Acknowledgement": "Please acknowledge the Principal Investigator . Please acknowledge the Data Providers and CDAWeb when using these Data."
        }
      ],
      "ProcessingLevel": "Calibrated",
      "ProviderProcessingLevel": "Level 2",
      "InstrumentID": "spase://NASA/Instrument/TRACERS/AnalyzerCuspElectrons",
      "MeasurementType": "EnergeticParticles",
      "TemporalDescription": {
        "TimeSpan": {
          "StartDate": "2025-08-13T20:59:59.000",
          "RelativeStopDate": "-P6M"
        },
        "Cadence": "PT99999.999S"
      },
      "ObservedRegion": [
        "Earth.Magnetosphere",
        "Earth.NearSurface.Ionosphere",
        "Earth.NearSurface.Ionosphere.Topside",
        "Earth.NearSurface.AuroralRegion",
        "Earth.NearSurface.PolarCap"
      ],
      "Caveats": "Currently no cavests.",
      "Parameter": [
        {
          "Name": "UTC epoch at sweep midpoint",
          "ParameterKey": "Epoch",
          "Description": "UTC epoch at midpoint of energy sweep",
          "Units": "ns",
          "UnitsConversion": "1.0e-9>s",
          "RenderingHints": {
            "AxisLabel": "UTC Epoch",
            "ValueFormat": "I20"
          },
          "ValidMin": "2022-02-01T00:00:00.000000000",
          "ValidMax": "2030-01-01T00:00:00.000000000",
          "FillValue": "9999-12-31T23:59:59.999999999",
          "Support": {
            "SupportQuantity": "Temporal"
          }
        },
        {
          "Name": "ACE Electron Energy",
          "ParameterKey": "ts2_l2_ace_energy",
          "Description": "Energy at midpoint of ACE energy bins.",
          "Units": "eV",
          "RenderingHints": {
            "AxisLabel": "e- Energy",
            "ValueFormat": "E11.4",
            "ScaleType": "LogScale"
          },
          "Structure": {
            "Size": "49"
          },
          "ValidMin": "2.0000e+01",
          "ValidMax": "1.4290e+04",
          "FillValue": "nan",
          "Particle": {
            "ParticleType": "Electron",
            "ParticleQuantity": "Energy"
          }
        },
        {
          "Name": "ACE Electron Energy Scaling by Anode",
          "ParameterKey": "ts2_l2_ace_energy_anode_factor",
          "Description": "Scaling factor for ACE energy at each anode.",
          "Units": "e",
          "RenderingHints": {
            "AxisLabel": "Anode Energy Fac",
            "ValueFormat": "E11.4",
            "ScaleType": "LogScale"
          },
          "Structure": {
            "Size": "21"
          },
          "ValidMin": "0.0000e+00",
          "ValidMax": "1.0000e+01",
          "FillValue": "nan",
          "Support": {
            "SupportQuantity": "Housekeeping"
          }
        },
        {
          "Name": "ACE Anode Angle in TSCS",
          "ParameterKey": "ts2_l2_ace_TSCS_anode_angle",
          "Description": "ACE anode angles from +Z-axis in TSCS frame.",
          "Units": "°",
          "RenderingHints": {
            "AxisLabel": "Anode Ang.",
            "ValueFormat": "F5.1",
            "ScaleType": "LinearScale"
          },
          "Structure": {
            "Size": "21"
          },
          "ValidMin": "-10.0",
          "ValidMax": "190.0",
          "FillValue": "nan",
          "Support": {
            "Qualifier": "DirectionAngle",
            "SupportQuantity": "Orientation"
          }
        },
        {
          "Name": "ACE Anode Num",
          "ParameterKey": "ts2_l2_ace_anode_number",
          "Description": "ACE anode number",
          "RenderingHints": {
            "AxisLabel": "Anode Num",
            "ValueFormat": "I2",
            "ScaleType": "LinearScale"
          },
          "Structure": {
            "Size": "21"
          },
          "ValidMin": "1",
          "ValidMax": "21",
          "FillValue": "65535",
          "Support": {
            "SupportQuantity": "Housekeeping"
          }
        },
        {
          "Name": "ACE Anode Electron Velocity (TSCS)",
          "ParameterKey": "ts2_l2_ace_TSCS_anode_velocity_dir_xyz",
          "Description": "ACE anode electron velocity direction in TSCS frame.",
          "Units": "°",
          "RenderingHints": {
            "AxisLabel": "ACE e- Vel",
            "ValueFormat": "E11.4",
            "ScaleType": "LinearScale"
          },
          "Structure": {
            "Size": "3 21"
          },
          "FillValue": "nan",
          "Support": {
            "Qualifier": "DirectionAngle",
            "SupportQuantity": "Orientation"
          }
        },
        {
          "Name": "ACE Differential Energy Flux",
          "Set": "Time series defined by using: Epoch",
          "ParameterKey": "ts2_l2_ace_def",
          "Description": "Electron differential energy flux at 49 energies over 21 look directions..\n\n* Column 1 Labels from TS2_L2_ACE_ENERGY: [\"E1\",\"E2\",\"E3\",\"E4\",\"E5\",\"E6\",\"E7\",\"E8\",\"E9\",\"E10\",\"E11\",\"E12\",\"E13\",\"E14\",\"E15\",\"E16\",\"E17\",\"E18\",\"E19\",\"E20\",\"E21\",\"E22\",\"E23\",\"E24\",\"E25\",\"E26\",\"E27\",\"E28\",\"E29\",\"E30\",\"E31\",\"E32\",\"E33\",\"E34\",\"E35\",\"E36\",\"E37\",\"E38\",\"E39\",\"E40\",\"E41\",\"E42\",\"E43\",\"E44\",\"E45\",\"E46\",\"E47\",\"E48\",\"E49\"].\n* Column 2 Labels from TS2_L2_ACE_TSCS_ANODE_ANGLE: [\"Anode -10.0\",\"Anode 0.0\",\"Anode 10.0\",\"Anode 20.0\",\"Anode 30.0\",\"Anode 40.0\",\"Anode 50.0\",\"Anode 60.0\",\"Anode 70.0\",\"Anode 80.0\",\"Anode 90.0\",\"Anode 100.0\",\"Anode 110.0\",\"Anode 120.0\",\"Anode 130.0\",\"Anode 140.0\",\"Anode 150.0\",\"Anode 160.0\",\"Anode 170.0\",\"Anode 180.0\",\"Anode 190.0\"].",
          "Cadence": "PT99999.999S",
          "Units": "eV eV!E-1!Ncm!E-2!Nsr!E-1!Ns!E-1!N",
          "RenderingHints": {
            "DisplayType": "Spectrogram",
            "AxisLabel": "e- Flux",
            "ValueFormat": "E10.3",
            "ScaleType": "LogScale"
          },
          "Structure": {
            "Size": "49 21"
          },
          "FillValue": "nan",
          "Particle": {
            "ParticleType": "Electron",
            "Qualifier": "Differential",
            "ParticleQuantity": "EnergyFlux"
          }
        },
        {
          "Name": "Electron Counts",
          "Set": "Time series defined by using: Epoch",
          "ParameterKey": "ts2_l2_ace_counts",
          "Description": "Electron raw counts at 49 energies over 21 look directions..\n\n* Column 1 Labels from TS2_L2_ACE_ENERGY: [\"E1\",\"E2\",\"E3\",\"E4\",\"E5\",\"E6\",\"E7\",\"E8\",\"E9\",\"E10\",\"E11\",\"E12\",\"E13\",\"E14\",\"E15\",\"E16\",\"E17\",\"E18\",\"E19\",\"E20\",\"E21\",\"E22\",\"E23\",\"E24\",\"E25\",\"E26\",\"E27\",\"E28\",\"E29\",\"E30\",\"E31\",\"E32\",\"E33\",\"E34\",\"E35\",\"E36\",\"E37\",\"E38\",\"E39\",\"E40\",\"E41\",\"E42\",\"E43\",\"E44\",\"E45\",\"E46\",\"E47\",\"E48\",\"E49\"].\n* Column 2 Labels from TS2_L2_ACE_TSCS_ANODE_ANGLE: [\"Anode -10.0\",\"Anode 0.0\",\"Anode 10.0\",\"Anode 20.0\",\"Anode 30.0\",\"Anode 40.0\",\"Anode 50.0\",\"Anode 60.0\",\"Anode 70.0\",\"Anode 80.0\",\"Anode 90.0\",\"Anode 100.0\",\"Anode 110.0\",\"Anode 120.0\",\"Anode 130.0\",\"Anode 140.0\",\"Anode 150.0\",\"Anode 160.0\",\"Anode 170.0\",\"Anode 180.0\",\"Anode 190.0\"].",
          "Cadence": "PT99999.999S",
          "Units": "raw counts",
          "RenderingHints": {
            "DisplayType": "Spectrogram",
            "AxisLabel": "Counts",
            "ValueFormat": "I4"
          },
          "Structure": {
            "Size": "49 21"
          },
          "FillValue": "65535",
          "Particle": {
            "ParticleType": "Electron",
            "ParticleQuantity": "Counts"
          }
        },
        {
          "Name": "Background Counts",
          "Set": "Time series defined by using: Epoch",
          "ParameterKey": "ts2_l2_ace_background_counts",
          "Description": "Background counts for each energy bin and anode..\n\n* Column 1 Labels from TS2_L2_ACE_ENERGY: [\"E1\",\"E2\",\"E3\",\"E4\",\"E5\",\"E6\",\"E7\",\"E8\",\"E9\",\"E10\",\"E11\",\"E12\",\"E13\",\"E14\",\"E15\",\"E16\",\"E17\",\"E18\",\"E19\",\"E20\",\"E21\",\"E22\",\"E23\",\"E24\",\"E25\",\"E26\",\"E27\",\"E28\",\"E29\",\"E30\",\"E31\",\"E32\",\"E33\",\"E34\",\"E35\",\"E36\",\"E37\",\"E38\",\"E39\",\"E40\",\"E41\",\"E42\",\"E43\",\"E44\",\"E45\",\"E46\",\"E47\",\"E48\",\"E49\"].\n* Column 2 Labels from TS2_L2_ACE_TSCS_ANODE_ANGLE: [\"Anode -10.0\",\"Anode 0.0\",\"Anode 10.0\",\"Anode 20.0\",\"Anode 30.0\",\"Anode 40.0\",\"Anode 50.0\",\"Anode 60.0\",\"Anode 70.0\",\"Anode 80.0\",\"Anode 90.0\",\"Anode 100.0\",\"Anode 110.0\",\"Anode 120.0\",\"Anode 130.0\",\"Anode 140.0\",\"Anode 150.0\",\"Anode 160.0\",\"Anode 170.0\",\"Anode 180.0\",\"Anode 190.0\"].",
          "Cadence": "PT99999.999S",
          "Units": "background counts",
          "RenderingHints": {
            "DisplayType": "Spectrogram",
            "AxisLabel": "Bg Cnts",
            "ValueFormat": "E10.3"
          },
          "Structure": {
            "Size": "49 21"
          },
          "FillValue": "nan",
          "Particle": {
            "ParticleType": "Electron",
            "ParticleQuantity": "Counts"
          }
        },
        {
          "Name": "Calibration Matrix",
          "Set": "Time series defined by using: Epoch",
          "ParameterKey": "ts2_l2_ace_cal_matrix",
          "Description": "Counts to differential energy flux calibration matrix..\n\n* Column 1 Labels from TS2_L2_ACE_ENERGY: [\"E1\",\"E2\",\"E3\",\"E4\",\"E5\",\"E6\",\"E7\",\"E8\",\"E9\",\"E10\",\"E11\",\"E12\",\"E13\",\"E14\",\"E15\",\"E16\",\"E17\",\"E18\",\"E19\",\"E20\",\"E21\",\"E22\",\"E23\",\"E24\",\"E25\",\"E26\",\"E27\",\"E28\",\"E29\",\"E30\",\"E31\",\"E32\",\"E33\",\"E34\",\"E35\",\"E36\",\"E37\",\"E38\",\"E39\",\"E40\",\"E41\",\"E42\",\"E43\",\"E44\",\"E45\",\"E46\",\"E47\",\"E48\",\"E49\"].\n* Column 2 Labels from TS2_L2_ACE_TSCS_ANODE_ANGLE: [\"Anode -10.0\",\"Anode 0.0\",\"Anode 10.0\",\"Anode 20.0\",\"Anode 30.0\",\"Anode 40.0\",\"Anode 50.0\",\"Anode 60.0\",\"Anode 70.0\",\"Anode 80.0\",\"Anode 90.0\",\"Anode 100.0\",\"Anode 110.0\",\"Anode 120.0\",\"Anode 130.0\",\"Anode 140.0\",\"Anode 150.0\",\"Anode 160.0\",\"Anode 170.0\",\"Anode 180.0\",\"Anode 190.0\"].",
          "Cadence": "PT99999.999S",
          "Units": "TBD",
          "RenderingHints": {
            "DisplayType": "Spectrogram",
            "AxisLabel": "Cal Matrix",
            "ValueFormat": "E10.3"
          },
          "Structure": {
            "Size": "49 21"
          },
          "FillValue": "nan",
          "Support": {
            "SupportQuantity": "Housekeeping"
          }
        }
      ]
    }
  }
}