{ "id": "THC_L1_STATE", "url": "http://hpde.io/NASA/NumericalData/THEMIS/C/Ephemeris/PT01M", "data-file": "./data/spase_hpde_io/info/THC_L1_STATE.json", "data": { "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/THEMIS/C/Ephemeris/PT01M", "NamingAuthority": "NASA", "ResourceType": "NumericalData", "ResourceHeader": { "ResourceName": "THEMIS-C Level 1 Probe State Data", "ReleaseDate": "2025-12-04T13:31:43Z", "RevisionHistory": { "RevisionEvent": [ { "ReleaseDate": "2021-04-27T15:38:11", "Note": "Only known prior ReleaseDate of the metadata" }, { "ReleaseDate": "2025-10-21T12:34:56.789", "Note": "Revised ObservedRegion. JMW" }, { "ReleaseDate": "2025-11-14T16:02:56Z", "Note": "Added PublicationInfo. Added ResourceType and NamingAuthority. 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. ZCB" }, { "ReleaseDate": "2025-12-04T13:31:43Z", "Note": "Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB" } ] }, "Description": "The L1 STATE files contain the following data, sampled at one-minute intervals:\n\n * probe position and velocity in GEI, GSE, and GSM coordinates;\n * flags to indicate regions of interest and maneuver status;\n * RA and declination of spin axis;\n * spin period and spin phase;\n * spin model parameters for high-precision interpolation of spin phase between one-minute data points.\n\n Version number indicates data source as follows:\n\n * V00: predicted ephemeris and attitude, no spin period or spin phase;\n * V01: predicted ephemeris and attitude, spin period and spin phase derived from probe telemetry;\n * V02: predicted attitude, definitive ephemeris from magnetometer and Doppler tracking data;\n * V03: corrected attitude and spin phase derived from fully calibrated magnetometer data. (added science attitude determination using perigee data post-processing).\n\n Produced by Mission Ops, Science Ops and Science Team.", "Acknowledgement": "NASA Contract NAS5-02099", "PublicationInfo": { "Authors": "Angelopoulos, Vassilis", "PublicationDate": "2025-11-14T16:02:56Z", "PublishedBy": "Space Physics Data Facility" }, "Contact": { "PersonID": "spase://SMWG/Person/Vassilis.Angelopoulos", "Role": "PrincipalInvestigator" }, "InformationURL": [ { "Name": "THEMIS Data Overview", "URL": "http://themis.ssl.berkeley.edu/overview_data.shtml", "Description": "Overview of THEMIS data, descriptions, and data policy." }, { "Name": "THEMIS Data Policy and Credits", "URL": "http://themis.ssl.berkeley.edu/roadrules.shtml", "Description": "Details on THEMIS data policy and giving proper credits in publications." }, { "Name": "THEMIS Ephemeris Format Definition", "URL": "https://spdf.gsfc.nasa.gov/pub/data/themis/documents/tdas/docs/thm_ogs_431m_ephemeris_format_definition.pdf", "Description": "Ephemeris file format and quantity details including RoI descriptions." } ], "PriorID": [ "spase://VMO/NumericalData/THEMIS/C/Ephemeris/PT01M", "spase://VSPO/NumericalData/THEMIS/C/Ephemeris/PT01M" ] }, "AccessInformation": [ { "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb", "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": "FTPS from SPDF (not with most browsers)", "URL": "ftps://spdf.gsfc.nasa.gov/pub/data/themis/thc/l1/state/", "Description": "NASA/GSFC CDAWeb ftp access to the data." }, "Format": "CDF", "Encoding": "None" }, { "RepositoryID": "spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb", "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/themis/thc/l1/state/", "Description": "In CDF via HTTP from SPDF" }, "Format": "CDF", "Encoding": "None" }, { "RepositoryID": "spase://SMWG/Repository/UCB/THEMIS", "Availability": "Online", "AccessRights": "Open", "AccessURL": { "Name": "CDAWeb", "URL": "https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=THC_L1_STATE&index=sp_phys", "ProductKey": "THC_L1_STATE", "Description": "Access to ASCII, CDF, and plots via NASA/GSFC CDAWeb" }, "Format": "CDF", "Encoding": "None" }, { "RepositoryID": "spase://SMWG/Repository/UCB/THEMIS", "Availability": "Online", "AccessRights": "Open", "AccessURL": { "Name": "SSCWeb", "URL": "https://sscweb.gsfc.nasa.gov/cgi-bin/Locator.cgi", "ProductKey": "themisc" }, "Format": "CDF", "Encoding": "None" }, { "RepositoryID": "spase://SMWG/Repository/UCB/THEMIS", "Availability": "Online", "AccessRights": "Open", "AccessURL": { "Name": "THEMIS L1 state data at UC Berkeley", "URL": "http://themis.ssl.berkeley.edu/data/themis/thc/l1/state/", "Description": "CDF data files for download, organized by date." }, "Format": "CDF", "Encoding": "None" }, { "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": "CDAWeb HAPI Server", "URL": "https://cdaweb.gsfc.nasa.gov/hapi", "Style": "HAPI", "ProductKey": [ "THC_L1_STATE@0", "THC_L1_STATE@1", "THC_L1_STATE@2" ], "Description": "Web Service to this product using the HAPI interface." }, "Format": "CSV" } ], "ProcessingLevel": "Uncalibrated", "ProviderProcessingLevel": "Level 1", "ProviderVersion": "v3", "InstrumentID": "spase://SMWG/Instrument/THEMIS/C/Ephemeris", "MeasurementType": "Ephemeris", "TemporalDescription": { "TimeSpan": { "StartDate": "2007-02-17T23:35:58", "RelativeStopDate": "-P7D" }, "Cadence": "PT01M" }, "ObservedRegion": [ "Heliosphere.NearEarth", "Earth.Magnetosphere.Magnetotail", "Earth.Magnetosphere.Main", "Earth.Magnetosheath", "Earth.Magnetosphere", "Earth.Magnetosphere.RadiationBelt" ], "Caveats": "Typical cadence is 1 min, occasionally 3s.", "Parameter": { "thc_pos": { "Name": "THEMIS-C Position (GEI)", "ParameterKey": "thc_pos", "Description": "THEMIS-C position vector (km) in GEI coordinates.", "Units": "km", "UnitsConversion": "1e3>m", "CoordinateSystem": { "CoordinateRepresentation": "Cartesian", "CoordinateSystemName": "GEI" }, "Structure": { "Size": "3", "Element": [ { "Name": "X GEI", "Qualifier": "Component.I", "Index": "1" }, { "Name": "Y GEI", "Qualifier": "Component.J", "Index": "2" }, { "Name": "Z GEI", "Qualifier": "Component.K", "Index": "3" } ] }, "ValidMin": "-1000000.0", "ValidMax": "1000000.0", "FillValue": "NaN", "Support": { "Qualifier": "Vector", "SupportQuantity": "Positional" } }, "thc_vel": { "Name": "THEMIS-C Velocity (GEI)", "ParameterKey": "thc_vel", "Description": "THEMIS-C velocity vector (km/s) in GEI coordinates.", "Units": "km/s", "UnitsConversion": "1e3>m/s", "CoordinateSystem": { "CoordinateRepresentation": "Cartesian", "CoordinateSystemName": "GEI" }, "Structure": { "Size": "3", "Element": [ { "Name": "Vx GEI", "Qualifier": "Component.I", "Index": "1" }, { "Name": "Vy GEI", "Qualifier": "Component.J", "Index": "2" }, { "Name": "Vz GEI", "Qualifier": "Component.K", "Index": "3" } ] }, "ValidMin": "-1000.0", "ValidMax": "1000.0", "FillValue": "NaN", "Support": { "Qualifier": "Vector", "SupportQuantity": "Velocity" } }, "thc_man": { "Name": "THEMIS-C Maneuver Flag", "ParameterKey": "thc_man", "Description": "THEMIS-C maneuver status code (XYYZZZ). Values indicate if/what maneuver is being performed. Spacecraft data will be unreliable during maneuvers.\n\n * Unpowered flight (Coast):\n - X=0, Y=00, Z=000 \n * Sequence Code X:\n - 0= No Segmentation\n - 1= Segmented Maneuver\n * Type Code YY:\n - 0= No Maneuver\n - 1= Axial-thrust Maneuver\n - 2= Side-thrust Maneuver\n - 3= Beta-thrust Maneuver\n - 4= Attitude Precession\n - 5= Spin-Rate Change\n * Sequence Number ZZZ:\n - 001-999= Maneuver Sequence Number", "ValidMin": "0", "ValidMax": "4294967295", "FillValue": "4294967295", "Support": { "SupportQuantity": "Other" } }, "thc_roi": { "Name": "THEMIS-C RoI", "ParameterKey": "thc_roi", "Description": "Region of interest. Different bits of this parameter give a general indication of the region thct the spacecraft is in. The first 18 bits are significant. An active bit indicates the spacecraft is in a given region. Multiple bits may be set simultaneously. The value of the bit is in parentheses in the following table.\n\n +---------------------------------------------------+\n | Bit 1(1) | Earth Shadow |\n | Bit 2(2) | Lunar Shadow |\n | Bit 3(4) | Atmospheric absorbtion zone |\n | Bit 4(8) | South Atlantic Anomaly |\n | Bit 5(16) | Northern Auroral Zone |\n | Bit 6(32) | Southern Auroral Zone |\n | Bit 7(64) | Perigee Passage |\n | Bit 8(128) | Inner & Outer Radiation Belts |\n | Bit 9(256) | Deep Plasma Sphere |\n | Bit 10(512) | Foreshock Solar Wind |\n | Bit 11(1024) | Solar Wind Beam |\n | Bit 12(2048) | High Magnetic Field |\n | Bit 13(4096) | Average Plasma Sheet |\n | Bit 14(8192) | Bowshock Crossing |\n | Bit 15(16384) | Magnetopause Crossing |\n | Bit 16(32768) | Ground Based Observatories |\n | Bit 17(65536) | 2-Day Conjunctions |\n | Bit 18(131072)| 4-Day Conjunctions |\n +---------------------------------------------------+", "ValidMin": "0", "ValidMax": "4294967295", "FillValue": "4294967295", "Support": { "SupportQuantity": "Other" } }, "thc_spinras": { "Name": "THEMIS-C Spin Right Ascension", "ParameterKey": "thc_spinras", "Description": "THEMIS-C spin axis right ascension in GEI coordinates.", "Caveats": "Measured from GEI x-axis towards GEI y-axis.", "Units": "deg", "CoordinateSystem": { "CoordinateRepresentation": "Spherical", "CoordinateSystemName": "GEI" }, "ValidMin": "0.0", "ValidMax": "360.0", "FillValue": "NaN", "Support": { "Qualifier": "DirectionAngle.AzimuthAngle", "SupportQuantity": "Positional" } }, "thc_spindec": { "Name": "THEMIS-C Spin Declination", "ParameterKey": "thc_spindec", "Description": "THEMIS-C spin axis declination in GEI coordinates.", "Caveats": "Measured from GEI x-y axis towards GEI z-axis.", "Units": "deg", "CoordinateSystem": { "CoordinateRepresentation": "Spherical", "CoordinateSystemName": "GEI" }, "ValidMin": "-90.0", "ValidMax": "90.0", "FillValue": "NaN", "Support": { "Qualifier": "DirectionAngle.ElevationAngle", "SupportQuantity": "Positional" } }, "thc_spinalpha": { "Name": "THEMIS-C Spin Alpha", "ParameterKey": "thc_spinalpha", "Description": "THEMIS-C spin axis azimuth, Euler alpha, in Probe Geometric (SPG) coordinates", "Units": "deg", "CoordinateSystem": { "CoordinateRepresentation": "Spherical", "CoordinateSystemName": "SC" }, "ValidMin": "0.0", "ValidMax": "360.0", "FillValue": "NaN", "Support": { "Qualifier": "DirectionAngle.AzimuthAngle", "SupportQuantity": "Positional" } }, "thc_spinbeta": { "Name": "THEMIS-C Spin Beta", "ParameterKey": "thc_spinbeta", "Description": "THEMIS-C spin axis colatitude, Euler beta, in Probe Geometric (SPG) coordinates", "Units": "deg", "CoordinateSystem": { "CoordinateRepresentation": "Spherical", "CoordinateSystemName": "SC" }, "ValidMin": "0.0", "ValidMax": "180.0", "FillValue": "NaN", "Support": { "Qualifier": "DirectionAngle.PolarAngle", "SupportQuantity": "Positional" } }, "thc_spinper": { "Name": "THEMIS-C Spin Period", "ParameterKey": "thc_spinper", "Description": "THEMIS-C spin period, regularized and boxcar averaged.", "Units": "s", "ValidMin": "0.0", "ValidMax": "30.0", "FillValue": "NaN", "Support": { "SupportQuantity": "Temporal" } }, "thc_spinphase": { "Name": "THEMIS-C Spin PhaseAngle", "ParameterKey": "thc_spinphase", "Description": "THEMIS-C angle rotated since the sun sensor registered the sun pulse, regularized and boxcar averaged.", "Units": "deg", "ValidMin": "0.0", "ValidMax": "360.0", "FillValue": "NaN", "Support": { "Qualifier": "PhaseAngle", "SupportQuantity": "Positional" } }, "thc_state_time": { "Name": "THEMIS-C Time", "ParameterKey": "thc_state_time", "Description": "Time, UTC, in seconds since 01-Jan-1970 00:00:00.", "Caveats": "Not including leap seconds.", "Units": "s", "ValidMin": "0.0", "ValidMax": "5.0E9", "FillValue": "NaN", "Support": { "SupportQuantity": "Temporal" } }, "thc_spin_correction_time": { "Name": "Spin Correction Time", "ParameterKey": "thc_spin_correction_time", "Description": "Spin correction time, UTC, in seconds since 01-Jan-1970 00:00:00", "Caveats": "Unleaped seconds", "Units": "s", "ValidMin": "0.0", "ValidMax": "5.0E9", "FillValue": "NaN", "Support": { "SupportQuantity": "Temporal" } }, "thc_spin_spinper": { "Name": "THEMIS-C Initial Spin Period", "ParameterKey": "thc_spin_spinper", "Description": "Initial spin period for segment.", "Units": "s", "ValidMin": "0.0", "ValidMax": "30.0", "FillValue": "NaN", "Support": { "SupportQuantity": "Temporal" } }, "thc_spin_time": { "Name": "THEMIS-C Spin Time", "ParameterKey": "thc_spin_time", "Description": "Spin time, UTC, in seconds since 01-Jan-1970 00:00:00.", "Caveats": "Not including leap seconds.", "Units": "s", "ValidMin": "0.0", "ValidMax": "5.0E9", "FillValue": "NaN", "Support": { "SupportQuantity": "Temporal" } }, "thc_spin_tend": { "Name": "THEMIS-C Spin End Time", "ParameterKey": "thc_spin_tend", "Description": "Segment end time, UTC, in seconds since 01-Jan-1970 00:00:00", "Caveats": "Not including leap seconds", "Units": "s", "ValidMin": "0.0", "ValidMax": "5.0E9", "FillValue": "NaN", "Support": { "SupportQuantity": "Temporal" } }, "thc_spin_c": { "Name": "THEMIS-C Drift Term ('c')", "ParameterKey": "thc_spin_c", "Description": "Drift term for spin rate", "Caveats": "Applies to angular velocity (deg/sec), not spin period.", "Units": "deg/s^2", "ValidMin": "-30.0", "ValidMax": "30.0", "FillValue": "NaN", "Support": { "SupportQuantity": "Other" } }, "thc_spin_correction": { "Name": "THEMIS-C Spin Correction", "ParameterKey": "thc_spin_correction", "Description": "Spin phase correction from definitive position and field model calculated at 1 minute intervals", "Units": "deg", "ValidMin": "-180.0", "ValidMax": "180.0", "FillValue": "NaN", "Support": { "Qualifier": "DirectionAngle", "SupportQuantity": "Other" } }, "thc_spinras_correction": { "Name": "Spin Axis Right Ascension Correction", "ParameterKey": "thc_spinras_correction", "Description": "Spin axis right ascension correction from definitive position and field model", "Units": "deg", "ValidMin": "-180", "ValidMax": "180", "FillValue": "NaN", "Support": { "SupportQuantity": "Other" } }, "thc_spindec_correction": { "Name": "Spin Axis Declination Correction", "ParameterKey": "thc_spindec_correction", "Description": "Spin axis declination correction from definitive position and field model", "Units": "deg", "ValidMin": "-180", "ValidMax": "180", "FillValue": "NaN", "Support": { "SupportQuantity": "Other" } }, "thc_spin_phaserr": { "Name": "THEMIS-C Phase Error", "ParameterKey": "thc_spin_phaserr", "Description": "Maximum absolute phase error between model and non-outlier sun crossing time.", "Caveats": "Errors due to recognized BAU timing errors do not contribute to this quantity.", "Units": "s", "ValidMin": "0.0", "ValidMax": "30.0", "FillValue": "NaN", "Support": { "Qualifier": "Uncertainty", "SupportQuantity": "Temporal" } }, "thc_spin_nspins": { "Name": "THEMIS-C Spin Number", "ParameterKey": "thc_spin_nspins", "Description": "Number of spins contained in this segment.", "ValidMin": "0", "ValidMax": "65535", "FillValue": "65535", "Support": { "SupportQuantity": "Other" } }, "thc_spin_npts": { "Name": "THEMIS-C Sample Number", "ParameterKey": "thc_spin_npts", "Description": "Number of samples (points) contained in this segment.", "ValidMin": "0", "ValidMax": "65535", "FillValue": "65535", "Support": { "SupportQuantity": "Other" } }, "thc_spin_maxgap": { "Name": "THEMIS-C Pulse Gap", "ParameterKey": "thc_spin_maxgap", "Description": "Duration, in seconds, of longest gap between sun pulses in this segment. Long gaps (60 sec or more) will generally indicate shadow periods.", "Units": "s", "ValidMin": "0.0", "ValidMax": "86400.0", "FillValue": "NaN", "Support": { "SupportQuantity": "Temporal" } }, "thc_pos_gse": { "Name": "THEMIS-C Position (GSE)", "ParameterKey": "thc_pos_gse", "Description": "Spacecraft position vector (km) in GSE coordinates.", "Cadence": "PT01M", "Units": "km", "UnitsConversion": "1e3>m", "CoordinateSystem": { "CoordinateRepresentation": "Cartesian", "CoordinateSystemName": "GSE" }, "Structure": { "Size": "3", "Element": [ { "Name": "X GSE", "Qualifier": "Component.I", "Index": "1" }, { "Name": "Y GSE", "Qualifier": "Component.J", "Index": "2" }, { "Name": "Z GSE", "Qualifier": "Component.K", "Index": "3" } ] }, "ValidMin": "-1000000.0", "ValidMax": "1000000.0", "FillValue": "NaN", "Support": { "Qualifier": "Vector", "SupportQuantity": "Positional" } }, "thc_pos_gsm": { "Name": "THEMIS-C Position (GSM)", "ParameterKey": "thc_pos_gsm", "Description": "Spacecraft position vector (km) in GSM coordinates.", "Cadence": "PT01M", "Units": "km", "UnitsConversion": "1e3>m", "CoordinateSystem": { "CoordinateRepresentation": "Cartesian", "CoordinateSystemName": "GSM" }, "Structure": { "Size": "3", "Element": [ { "Name": "X GSM", "Qualifier": "Component.I", "Index": "1" }, { "Name": "Y GSM", "Qualifier": "Component.J", "Index": "2" }, { "Name": "Z GSM", "Qualifier": "Component.K", "Index": "3" } ] }, "ValidMin": "-1000000.0", "ValidMax": "1000000.0", "FillValue": "NaN", "Support": { "Qualifier": "Vector", "SupportQuantity": "Positional" } }, "thc_vel_gse": { "Name": "THEMIS-C Velocity (GSE)", "ParameterKey": "thc_vel_gse", "Description": "Spacecraft velocity (km/s) in GSE coordinates.", "Cadence": "PT01M", "Units": "km/s", "UnitsConversion": "1e3>m/s", "CoordinateSystem": { "CoordinateRepresentation": "Cartesian", "CoordinateSystemName": "GSE" }, "Structure": { "Size": "3", "Element": [ { "Name": "Vx GSE", "Qualifier": "Component.I", "Index": "1" }, { "Name": "Vy GSE", "Qualifier": "Component.J", "Index": "2" }, { "Name": "Vz GSE", "Qualifier": "Component.K", "Index": "3" } ] }, "ValidMin": "-1000.0", "ValidMax": "1000.0", "FillValue": "NaN", "Support": { "Qualifier": "Vector", "SupportQuantity": "Velocity" } }, "thc_vel_gsm": { "Name": "THEMIS-C Velocity (GSM)", "ParameterKey": "thc_vel_gsm", "Description": "Spacecraft velocity (km/s) in GSM coordinates.", "Cadence": "PT01M", "Units": "km/s", "UnitsConversion": "1e3>m/s", "CoordinateSystem": { "CoordinateRepresentation": "Cartesian", "CoordinateSystemName": "GSM" }, "Structure": { "Size": "3", "Element": [ { "Name": "Vx GSM", "Qualifier": "Component.I", "Index": "1" }, { "Name": "Vy GSM", "Qualifier": "Component.J", "Index": "2" }, { "Name": "Vz GSM", "Qualifier": "Component.K", "Index": "3" } ] }, "ValidMin": "-1000.0", "ValidMax": "1000.0", "FillValue": "NaN", "Support": { "Qualifier": "Vector", "SupportQuantity": "Velocity" } } } } } } }