{ "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-2.7.2.xsd", "Version": "2.7.2", "MetadataRightsList": { "Rights": { "SchemeURI": "https://spdx.org/licenses/", "RightsIdentifierScheme": "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/ICON/IVM/L3/In-Situ-Ions/P10D", "NamingAuthority": "NASA", "ResourceType": "NumericalData", "ResourceHeader": { "ResourceName": "ICON Ion Velocity Meter (IVM) A In Situ Ions Data", "AlternateName": "IVM A In Situ Ions Data", "DOI": "https://doi.org/10.48322/5zxj-y481", "ReleaseDate": "2026-09-04T19:16:51Z", "RevisionHistory": { "RevisionEvent": [ { "ReleaseDate": "2026-08-04T13:29:31Z", "Note": "First release" }, { "ReleaseDate": "2026-09-04T19:16:51Z", "Note": "Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. Added DOI. TLK" } ] }, "Description": "ICON In Situ Ions; 48-day windows of data from the L2.7 v08 product are collected into longitude, latitude, and local time bins. Mean and standard deviations of each parameter are reported in this file. The IVM consists of two planar thermal ion sensors, a retarding potential analyzer (RPA) and an ion drift meter (IDM).", "Acknowledgement": "National Aeronautics and Space Administration; Dr. Roderick A. Heelis; Dr. Thomas Immel", "PublicationInfo": { "Authors": "Heelis, R. A.", "PublicationDate": "2026-06-16T00:00:00", "PublishedBy": "Space Physics Data Facility" }, "Funding": [ { "Agency": "National Aeronautics and Space Administration", "Project": "Explorers Program", "AwardNumber": "NNG12FA44C" }, { "Agency": "National Aeronautics and Space Administration", "Project": "Explorers Program", "AwardNumber": "contracts NNG12FA42I" } ], "Contact": { "PersonID": "spase://SMWG/Person/Roderick.A.Heelis", "Role": "PrincipalInvestigator" }, "InformationURL": [ { "Name": "Additional information on ICON", "URL": "https://icon.ssl.berkeley.edu/", "Description": "ICON spacecraft Homepage." }, { "Name": "Ion Velocity Measurements for the Ionospheric Connections Explorer", "URL": "https://doi.org/10.1007/s11214-017-0383-3", "Description": "Space Science Reviews, 212(1-2), pp.615-629. DOI: 10.1007/s11214-017-0383-3" } ], "PriorID": "spase://NASA/NumericalData/ICON/IVM/L2/PT1S" }, "AccessInformation": [ { "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb", "Availability": "Online", "AccessRights": "Open", "RightsList": { "Rights": { "SchemeURI": "https://spdx.org/licenses/", "RightsIdentifierScheme": "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": "CDAWeb HAPI Server", "URL": "https://cdaweb.gsfc.nasa.gov/hapi", "Style": "HAPI", "ProductKey": "ICON_L3-3_In-Situ-Ions", "Description": "Web Service to this product using the HAPI interface." }, "Format": "NetCDF", "Acknowledgement": "National Aeronautics and Space Administration; Dr. Roderick A. Heelis; Dr. Thomas Immel." }, { "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb", "Availability": "Online", "AccessRights": "Open", "RightsList": { "Rights": { "SchemeURI": "https://spdx.org/licenses/", "RightsIdentifierScheme": "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/icon/l2/l2-7_ivm-a/", "ProductKey": "ICON_L3-3_In-Situ-Ions", "Description": "Access to Data in NetCDF Format via https from SPDF" }, { "Name": "CDAWeb", "URL": "https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=ICON_L3-3_In-Situ-Ions&index=sp_phys", "ProductKey": "ICON_L3-3_In-Situ-Ions", "Description": "Access to ASCII, NetCDF, CDF, and Plots via NASA/GSFC CDAWeb" } ], "Format": "NetCDF", "Encoding": "None", "Acknowledgement": "National Aeronautics and Space Administration; Dr. Roderick A. Heelis; Dr. Thomas Immel." } ], "ProcessingLevel": "Calibrated", "ProviderName": "ICON Ion Velocity Meter team", "InstrumentID": "spase://SMWG/Instrument/ICON/IVM", "MeasurementType": "Dopplergram", "TemporalDescription": { "TimeSpan": { "StartDate": "2019-12-11T11:17:54Z", "StopDate": "2022-11-05T11:25:37Z" }, "Cadence": "P10D" }, "ObservedRegion": [ "Earth.NearSurface.Atmosphere", "Earth.NearSurface.Ionosphere" ], "Parameter": [ { "Name": "Epoch time", "ParameterKey": "Epoch", "Description": "Time corresponding to the middle of each 48 day average, in milliseconds since Jan 1 1970.", "Cadence": "P10D", "Units": "ms", "FillValue": "-999", "Support": { "Qualifier": "Magnitude", "SupportQuantity": "Temporal" } }, { "Name": "48 day bins RPA", "ParameterKey": "ICON_L33_Included_Dates_RPA", "Description": "Dates used in each 48 day bin, in string format, in the format: 2017-05-27; data measured by the Retarding Potential Analyzer; from RPA flag used in all data products.", "Cadence": "P10D", "FillValue": "-999", "Support": { "Qualifier": "Magnitude", "SupportQuantity": "Temporal" } }, { "Name": "48 day bins DM", "ParameterKey": "ICON_L33_Included_Dates_DM", "Description": "Dates used in each 48 day bin, in string format, in the format: 2017-05-27; data measured by the Drift Meter; from DM flag used only in drifts (not in ion temperature, ion density, ion density O.", "Cadence": "P10D", "FillValue": "-999", "Support": { "Qualifier": "Magnitude", "SupportQuantity": "Temporal" } }, { "Name": "Ion Density", "ParameterKey": "ICON_L33_ION_DENSITY", "Description": "Mean value of ion density, taken over all good quality L2 datapoints in a 48-day time-span, as a function of longitude, latitude, time. Derived from ICON_L27_ION_DENSITY.", "Cadence": "P10D", "Units": "N/cc", "ValidMin": "0", "ValidMax": "1.000000020040877e+20", "FillValue": "NaN", "Particle": { "ParticleType": "Ion", "Qualifier": "Magnitude", "ParticleQuantity": "NumberDensity", "AtomicNumber": "1" } }, { "Name": "Ion Temperature", "ParameterKey": "ICON_L33_ION_TEMPERATURE", "Description": "Mean value of ion temperature, taken over all good quality L2 datapoints in a 48-day time-span, as a function of longitude, latitude, time. Derived from ICON_L27_ION_TEMPERATURE.", "Cadence": "P10D", "Units": "K", "ValidMin": "0", "ValidMax": "1.000000020040877e+20", "FillValue": "NaN", "Particle": { "ParticleType": "Ion", "Qualifier": "Scalar", "ParticleQuantity": "Temperature" } }, { "Name": "Fraction of Total Plasma Number Density that is O+", "ParameterKey": "ICON_L33_FRACTIONAL_ION_DENSITY_O", "Description": "Mean value of fraction of total plasma number density that is O+ taken over all good quality L2 datapoints in a 48-day time-span, as a function of longitude, latitude, time. Derived from FRACTIONAL_ION_DENSITY_O.", "Cadence": "P10D", "Units": "dimensionless", "ValidMin": "0", "ValidMax": "1.000000020040877e+20", "FillValue": "NaN", "Particle": { "ParticleType": "Ion", "Qualifier": "Magnitude", "ParticleQuantity": "NumberDensity", "AtomicNumber": "8" } }, { "Name": "Binned Field-Aligned Ion Velocity", "ParameterKey": "ICON_L33_ION_VELOCITY_FIELD_ALIGNED", "Description": "Mean value of field-aligned ion velocity, taken over all good quality L2 datapoints in a 48-day time-span, as a function of longitude, latitude, time. Derived from ION_VELOCITY_FIELD_ALIGNED.", "Cadence": "P10D", "Units": "m/s", "ValidMin": "-1.000000020040877e+20", "ValidMax": "1.000000020040877e+20", "FillValue": "NaN", "Particle": { "ParticleType": "Ion", "Qualifier": "Vector", "ParticleQuantity": "Velocity" } }, { "Name": "Binned Meridional Ion Velocity", "ParameterKey": "ICON_L33_ION_VELOCITY_MERIDIONAL", "Description": "Mean value of meridional ion velocity, taken over all good quality L2 datapoints in a 48-day time-span, as a function of longitude, latitude, time.\n Derived from ION_VELOCITY_MERIDIONAL. Meridional ion velocity is the ion velocity along local magnetic meridional direction, perpendicular to geomagnetic field and within local magnetic \n meridional plane. The local meridional vector maps to vertical at the magnetic equator, positive is up.", "Cadence": "P10D", "Units": "m/s", "ValidMin": "-1.000000020040877e+20", "ValidMax": "1.000000020040877e+20", "FillValue": "NaN", "Particle": { "ParticleType": "Ion", "Qualifier": "Vector", "ParticleQuantity": "Velocity" } }, { "Name": "Binned Zonal Ion Velocity", "ParameterKey": "ICON_L33_ION_VELOCITY_ZONAL", "Description": "Mean value of zonal ion velocity, taken over all good quality L2 datapoints in a 48-day time-span, as a function of longitude, latitude, time. Derived from ION_VELOCITY_ZONAL.", "Cadence": "P10D", "Units": "m/s", "ValidMin": "-1.000000020040877e+20", "ValidMax": "1.000000020040877e+20", "FillValue": "NaN", "Particle": { "ParticleType": "Ion", "Qualifier": "Vector", "ParticleQuantity": "FlowSpeed" } }, { "Name": "Binned IVM Measured Ion Drifts along East", "ParameterKey": "ICON_L33_ION_VELOCITY_EAST", "Description": "Mean value of IVM measured ion drifts along East direction, taken over all good quality L2 datapoints in a 48-day time-span, as a function of longitude, latitude, time. Derived from ION_VELOCITY_EAST.", "Cadence": "P10D", "ValidMin": "-1.000000020040877e+20", "ValidMax": "1.000000020040877e+20", "FillValue": "NaN", "Particle": { "ParticleType": "Ion", "Qualifier": "Vector", "ParticleQuantity": "FlowSpeed" } }, { "Name": "Binned IVM Measured Ion Drifts along North", "ParameterKey": "ICON_L33_ION_VELOCITY_NORTH", "Description": "Mean value of IVM measured ion drifts along North direction, taken over all good quality L2 datapoints in a 48-day time-span, as a function of longitude, latitude, time. Derived from ION_VELOCITY_NORTH.", "Cadence": "P10D", "ValidMin": "-1.000000020040877e+20", "ValidMax": "1.000000020040877e+20", "FillValue": "NaN", "Particle": { "ParticleType": "Ion", "Qualifier": "Vector", "ParticleQuantity": "FlowSpeed" } }, { "Name": "Binned IVM measured ion drifts along Up", "ParameterKey": "ICON_L33_ION_VELOCITY_UP", "Description": "Mean value of IVM measured ion drifts along up direction, taken over all good quality L2 datapoints in a 48-day time-span, as a function of longitude, latitude, time. Derived from ION_VELOCITY_UP.", "Cadence": "P10D", "ValidMin": "-1.000000020040877e+20", "ValidMax": "1.000000020040877e+20", "FillValue": "NaN", "Particle": { "ParticleType": "Ion", "Qualifier": "Vector", "ParticleQuantity": "FlowSpeed" } }, { "Name": "Number of Data Points in the RPA measured data", "ParameterKey": "ICON_L33_datapoints_RPA", "Description": "Number of data points in each 48 day average data, measured by the Retarding Potential Analyzer (RPA), as a function of longitude, latitude, time.", "Cadence": "P10D", "Units": "counts", "ValidMin": "0", "ValidMax": "1.000000020040877e+20", "FillValue": "0", "Support": { "Qualifier": "Magnitude", "SupportQuantity": "Other" } }, { "Name": "Number of Data Points in the DM measured data", "ParameterKey": "ICON_L33_datapoints_DM", "Description": "Number of data points in each 48 day average data, measured by the Drift Meter (DM) as a function of longitude, latitude, time.", "Cadence": "P10D", "Units": "counts", "ValidMin": "0", "ValidMax": "1.000000020040877e+20", "FillValue": "0", "Support": { "Qualifier": "Magnitude", "SupportQuantity": "Other" } }, { "Name": "Sigma Ion Density", "ParameterKey": "ICON_L33_Sigma_ION_DENSITY", "Description": "1 standard deviation of the good ion density values used to compute the mean, as a function of longitude, latitude, time.", "Cadence": "P10D", "Units": "N/cc", "ValidMin": "0", "ValidMax": "1.000000020040877e+20", "FillValue": "NaN", "Particle": { "ParticleType": "Ion", "Qualifier": "StandardDeviation", "ParticleQuantity": "NumberDensity", "AtomicNumber": "1" } }, { "Name": "Sigma Ion Temperature", "ParameterKey": "ICON_L33_Sigma_ION_TEMPERATURE", "Description": "1 standard deviation of the good fraction of ion temperature values used to compute the mean, as a function of longitude, latitude, time.", "Cadence": "P10D", "Units": "K", "ValidMin": "0", "ValidMax": "1.000000020040877e+20", "FillValue": "NaN", "Particle": { "ParticleType": "Ion", "Qualifier": "StandardDeviation", "ParticleQuantity": "Temperature" } }, { "Name": "Sigma Fraction of Total Plasma Number Density that is O+", "ParameterKey": "ICON_L33_Sigma_FRACTIONAL_ION_DENSITY_O", "Description": "1 standard deviation of the good fraction of total plasma number density that is O+ values used to compute the mean, as a function of longitude, latitude, time.", "Cadence": "P10D", "Units": "dimensionless", "ValidMin": "0", "ValidMax": "1.000000020040877e+20", "FillValue": "NaN", "Particle": { "ParticleType": "Ion", "Qualifier": "StandardDeviation", "ParticleQuantity": "NumberDensity", "AtomicNumber": "8" } }, { "Name": "Sigma Field-Aligned Ion Velocity", "ParameterKey": "ICON_L33_Sigma_ION_VELOCITY_FIELD_ALIGNED", "Description": "1 standard deviation of the good ion field aligned ion velocity values used to compute the mean, as a function of longitude, latitude, time.", "Cadence": "P10D", "Units": "m/s", "ValidMin": "-1.000000020040877e+20", "ValidMax": "1.000000020040877e+20", "FillValue": "NaN", "Particle": { "ParticleType": "Ion", "Qualifier": "StandardDeviation", "ParticleQuantity": "Velocity" } }, { "Name": "Sigma Meridional Ion Velocity", "ParameterKey": "ICON_L33_Sigma_ION_VELOCITY_MERIDIONAL", "Description": "1 standard deviation of the good ion meridional ion velocity values used to compute the mean, as a function of longitude, latitude, time.", "Cadence": "P10D", "Units": "m/s", "ValidMin": "-1.000000020040877e+20", "ValidMax": "1.000000020040877e+20", "FillValue": "NaN", "Particle": { "ParticleType": "Ion", "Qualifier": "StandardDeviation", "ParticleQuantity": "Velocity" } }, { "Name": "Sigma Zonal Ion Velocity", "ParameterKey": "ICON_L33_Sigma_ION_VELOCITY_ZONAL", "Description": "Mean value of zonal ion velocity, taken over all good quality L2 datapoints in a 48-day time-span, as a function of longitude, latitude, time. Derived from ION_VELOCITY_ZONAL.", "Cadence": "P10D", "Units": "m/s", "ValidMin": "-1.000000020040877e+20", "ValidMax": "1.000000020040877e+20", "FillValue": "NaN", "Particle": { "ParticleType": "Ion", "Qualifier": "StandardDeviation", "ParticleQuantity": "FlowSpeed" } }, { "Name": "Sigma of Ion Drifts along East direction", "ParameterKey": "ICON_L33_Sigma_ION_VELOCITY_EAST", "Description": "1 standard deviation of the good ion drifts along East direction values used to compute the mean, as a function of longitude, latitude, time.", "Cadence": "P10D", "ValidMin": "-1.000000020040877e+20", "ValidMax": "1.000000020040877e+20", "FillValue": "NaN", "Particle": { "ParticleType": "Ion", "Qualifier": "StandardDeviation", "ParticleQuantity": "FlowSpeed" } }, { "Name": "Sigma of ion drifts along North direction", "ParameterKey": "ICON_L33_Sigma_ION_VELOCITY_NORTH", "Description": "1 standard deviation of the good ion drifts along North direction values used to compute the mean, as a function of longitude, latitude, time.", "Cadence": "P10D", "ValidMin": "-1.000000020040877e+20", "ValidMax": "1.000000020040877e+20", "FillValue": "NaN", "Particle": { "ParticleType": "Ion", "Qualifier": "StandardDeviation", "ParticleQuantity": "FlowSpeed" } }, { "Name": "Sigma of ion drifts along Up direction", "ParameterKey": "ICON_L33_Sigma_ION_VELOCITY_UP", "Description": "1 standard deviation of the good ion drifts along Up direction values used to compute the mean, as a function of longitude, latitude, time.", "Cadence": "P10D", "ValidMin": "-1.000000020040877e+20", "ValidMax": "1.000000020040877e+20", "FillValue": "NaN", "Particle": { "ParticleType": "Ion", "Qualifier": "StandardDeviation", "ParticleQuantity": "FlowSpeed" } }, { "Name": "Local Time Bin", "ParameterKey": "ICON_L33_LocalTime", "Description": "Local time binned in 0.5 hour intervals, local time +/- 0.25 hours.", "Cadence": "P10D", "Units": "hours", "ValidMin": "6", "ValidMax": "18", "FillValue": "-999", "Support": { "Qualifier": "Direction", "SupportQuantity": "Positional" } }, { "Name": "Latitude Bin", "ParameterKey": "ICON_L33_Latitude", "Description": "Latitude of the IVM data, binned in 5 degree intervals, latitude +/- 2.5 degrees. Derived from ICON_IVM-A_L27_Latitude.", "Cadence": "P10D", "Units": "degrees", "ValidMin": "-20", "ValidMax": "35", "FillValue": "-999", "Support": { "Qualifier": "Direction", "SupportQuantity": "Positional" } }, { "Name": "Longitude Bin", "ParameterKey": "ICON_L33_Longitude", "Description": "Longitude of the O/N2 data, binned in 15 degree intervals, longitude +/- 7.5 degrees. Derived from ICON_L24_Disk_Longitude.", "Cadence": "P10D", "Units": "degrees", "ValidMin": "0", "ValidMax": "360", "FillValue": "-999", "Support": { "Qualifier": "Direction", "SupportQuantity": "Positional" } } ] } } }