SPASE Resource Description

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} function getVersionedBibTeX(bibtex) { /* Add version field as suggested by August (Gus) Muench, Journals Data Editor, American Astronomical Society (email dated 7/7/25) */ const accessVersion = ", version={Accessed on " + currentIsoDateStr + "}"; const modifiedBibtex = bibtex.substring(0, bibtex.lastIndexOf("}")) + accessVersion + "}"; return modifiedBibtex; } function getBlob(text) { return new Blob([text], { type: "text/plain"}); } function clipboardAlert(text) { alert(text + "\nCopied to clipboard"); } function clipCitation(doi) { document.body.style.cursor = 'wait'; let url = "https://citation.doi.org/format?doi=" + doi.replace("https://doi.org/", "") + String.fromCodePoint(38) + "style=bibtex" + String.fromCodePoint(38) + "lang=en-US"; const text = new ClipboardItem({ "text/plain": fetch(url) .then(getResponseText) .then(getVersionedBibTeX) .then(getBlob) }); navigator.clipboard.write([text]); text.getType("text/plain") .then(getResponseText) .then(clipboardAlert); } function toggle_usa_banner_details() { const details = document.getElementById("usa-banner-details"); const indicator = document.getElementById("usa-banner-indicator"); if (details.style.display === "none") { details.style.display = "block"; indicator.textContent = "^"; } else { details.style.display = "none"; indicator.textContent = "v"; } } const monthName=new Array("January","February","March","April","May","June","July","August","September","October","November","December"); let currentDate = new Date(); let currentIsoDateStr = currentDate.toISOString().substring(0, 10); let currentDateStr = currentDate.getFullYear() + '-' + monthName[currentDate.getMonth()] + '-' + currentDate.getDate(); Data Access FTPS from SPDF (not with most browsers) HTTPS from SPDF CDAWeb SSCWeb WebService: CDAWeb Programmatic Data Access WebService: SSCWeb Programmatic Data Access 4D Orbit Viewer HAPI: CDAWeb HAPI Server THEMIS L1 state data at UC Berkeley THEMIS-D Level 1 Probe State Data var authors='Angelopoulos, Vassilis'; document.write(authors); (2025). THEMIS-D Level 1 Probe State Data. [Data set]. University of California, Berkeley. https://doi.org/10.48322/xzx6-3311. Accessed on document.write(currentDateStr);. Note: Proper references, including Copy BibTeX Citation or other formats, should include the "Accessed on date" to identify the version of the resource being cited in a given publication. ResourceID spase://NASA/NumericalData/THEMIS/D/Ephemeris/PT01M Description The L1 STATE files contain the following data, sampled at one-minute intervals: * probe position and velocity in GEI, GSE, and GSM coordinates; * flags to indicate regions of interest and maneuver status; * RA and declination of spin axis; * spin period and spin phase; * spin model parameters for high-precision interpolation of spin phase between one-minute data points. Version number indicates data source as follows: * V00: predicted ephemeris and attitude, no spin period or spin phase; * V01: predicted ephemeris and attitude, spin period and spin phase derived from probe telemetry; * V02: predicted attitude, definitive ephemeris from magnetometer and Doppler tracking data; * V03: corrected attitude and spin phase derived from fully calibrated magnetometer data. (added science attitude determination using perigee data post-processing). Produced by Mission Ops, Science Ops and Science Team. Metadata Rights CC0-1.0: Creative Commons Zero v1.0 Universal Note CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions. The actual data/software may be subject to a different license. View XML | Edit Details Version:2.7.1 NumericalData ResourceID spase://NASA/NumericalData/THEMIS/D/Ephemeris/PT01M NamingAuthority NASA ResourceType NumericalData ResourceHeader ResourceName THEMIS-D Level 1 Probe State Data DOI https://doi.org/10.48322/xzx6-3311 ReleaseDate 2026-06-26 13:28:55Z RevisionHistory RevisionEvent ReleaseDate 2021-04-27 15:38:11Z Note Only known prior ReleaseDate of the metadata RevisionEvent ReleaseDate 2025-10-21 12:34:56.789Z Note Revised ObservedRegion. JMW RevisionEvent ReleaseDate 2025-11-14 16:03:07Z 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 RevisionEvent ReleaseDate 2025-12-04 13:31:45Z Note Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB RevisionEvent ReleaseDate 2026-06-26 13:28:55Z Note Add 'Z' to RevisionEvent:ReleaseDate(s), TemporalDescription:TimeSpan:StartDate. ZCB Description The L1 STATE files contain the following data, sampled at one-minute intervals: * probe position and velocity in GEI, GSE, and GSM coordinates; * flags to indicate regions of interest and maneuver status; * RA and declination of spin axis; * spin period and spin phase; * spin model parameters for high-precision interpolation of spin phase between one-minute data points. Version number indicates data source as follows: * V00: predicted ephemeris and attitude, no spin period or spin phase; * V01: predicted ephemeris and attitude, spin period and spin phase derived from probe telemetry; * V02: predicted attitude, definitive ephemeris from magnetometer and Doppler tracking data; * V03: corrected attitude and spin phase derived from fully calibrated magnetometer data. (added science attitude determination using perigee data post-processing). Produced by Mission Ops, Science Ops and Science Team. Acknowledgement NASA Contract NAS5-02099 PublicationInfo Authors Angelopoulos, Vassilis PublicationDate 2025-11-14 16:03:07Z PublishedBy University of California, Berkeley Contacts Role Person StartDate StopDate Note 1. PrincipalInvestigator spase://SMWG/Person/Vassilis.Angelopoulos InformationURL Name THEMIS Data Overview URL http://themis.ssl.berkeley.edu/overview_data.shtml Description Overview of THEMIS data, descriptions, and data policy. InformationURL 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. InformationURL 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. PriorIDs spase://VMO/NumericalData/THEMIS/D/Ephemeris/PT01M spase://VSPO/NumericalData/THEMIS/D/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/thd/l1/state/ Description NASA/GSFC CDAWeb ftp access to the data. AccessURL Name HTTPS from SPDF URL https://spdf.gsfc.nasa.gov/pub/data/themis/thd/l1/state/ Description In CDF via HTTP from SPDF AccessURL Name CDAWeb URL https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=THD_L1_STATE&index=sp_phys ProductKey THD_L1_STATE Description Access to ASCII, CDF, and plots via NASA/GSFC CDAWeb AccessURL Name SSCWeb URL https://sscweb.gsfc.nasa.gov/cgi-bin/Locator.cgi ProductKey themisd Format CDF Encoding None AccessDirectoryTemplate https://cdaweb.gsfc.nasa.gov/pub/data/themis/thd/l1/state/$Y AccessFilenameTemplate thd_l1_state_$Y$m$d_$v.cdf AccessInformation RepositoryID spase://SMWG/Repository/NASA/GSFC/SPDF Availability Online AccessRights Open AccessURL Name CDAWeb Programmatic Data Access URL https://cdaweb.gsfc.nasa.gov/WS/cdasr/1/dataviews/sp_phys/datasets/THD_L1_STATE/clientLibraryExample/ Style WebService ProductKey THD_L1_STATE Description Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS. Format Binary AccessInformation RepositoryID spase://SMWG/Repository/NASA/GSFC/SPDF Availability Online AccessRights Open AccessURL Name SSCWeb Programmatic Data Access URL https://sscweb.gsfc.nasa.gov/WS/sscr/2/observatories/THD_L1_STATE/clientLibraryExample/ Style WebService ProductKey THD_L1_STATE Description Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS. Format Binary AccessInformation RepositoryID spase://SMWG/Repository/NASA/GSFC/SPDF Availability Online AccessRights Open AccessURL Name 4D Orbit Viewer URL https://sscweb.gsfc.nasa.gov/4dorbit/?sc=THD_L1_STATE ProductKey THD_L1_STATE Description 4D viewer for this data. Note: this AccessInformation element was added by HDPWS. Format HTML 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 CDAWeb HAPI Server URL https://cdaweb.gsfc.nasa.gov/hapi Style HAPI ProductKey THD_L1_STATE@0 ProductKey THD_L1_STATE@1 ProductKey THD_L1_STATE@2 Description Web Service to this product using the HAPI interface. Format CSV AccessInformation 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/thd/l1/state/ Description CDF data files for download, organized by date. Format CDF Encoding None ProcessingLevel Uncalibrated ProviderProcessingLevel Level 1 ProviderVersion v3 InstrumentIDs spase://SMWG/Instrument/THEMIS/D/Ephemeris MeasurementType Ephemeris TemporalDescription TimeSpan StartDate 2007-02-17 23:35:58Z RelativeStopDate -P7D Cadence PT01M ObservedRegion Heliosphere.NearEarth ObservedRegion Earth.Magnetosphere.Magnetotail ObservedRegion Earth.Magnetosphere.Main ObservedRegion Earth.Magnetosheath ObservedRegion Earth.Magnetosphere ObservedRegion Earth.Magnetosphere.RadiationBelt Caveats Typical cadence is 1 min, occasionally 3s. Parameter #1 Name THEMIS-D Position (GEI) ParameterKey thd_pos Description THEMIS-D 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 Element Name Y GEI Qualifier Component.J Index 2 Element Name Z GEI Qualifier Component.K Index 3 ValidMin -1000000.0 ValidMax 1000000.0 FillValue NaN Support Qualifier Vector SupportQuantity Positional Parameter #2 Name THEMIS-D Velocity (GEI) ParameterKey thd_vel Description THEMIS-D 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 Element Name Vy GEI Qualifier Component.J Index 2 Element Name Vz GEI Qualifier Component.K Index 3 ValidMin -1000.0 ValidMax 1000.0 FillValue NaN Support Qualifier Vector SupportQuantity Velocity Parameter #3 Name THEMIS-D Maneuver Flag ParameterKey thd_man Description THEMIS-D maneuver status code (XYYZZZ). Values indicate if/what maneuver is being performed. Spacecraft data will be unreliable during maneuvers. * Unpowered flight (Coast): - X=0, Y=00, Z=000 * Sequence Code X: - 0= No Segmentation - 1= Segmented Maneuver * Type Code YY: - 0= No Maneuver - 1= Axial-thrust Maneuver - 2= Side-thrust Maneuver - 3= Beta-thrust Maneuver - 4= Attitude Precession - 5= Spin-Rate Change * Sequence Number ZZZ: - 001-999= Maneuver Sequence Number ValidMin 0 ValidMax 4294967295 FillValue 4294967295 Support SupportQuantity Other Parameter #4 Name THEMIS-D RoI ParameterKey thd_roi Description Region of interest. Different bits of this parameter give a general indication of the region thdt 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. +---------------------------------------------------+ | Bit 1(1) | Earth Shadow | | Bit 2(2) | Lunar Shadow | | Bit 3(4) | Atmospheric absorbtion zone | | Bit 4(8) | South Atlantic Anomaly | | Bit 5(16) | Northern Auroral Zone | | Bit 6(32) | Southern Auroral Zone | | Bit 7(64) | Perigee Passage | | Bit 8(128) | Inner & Outer Radiation Belts | | Bit 9(256) | Deep Plasma Sphere | | Bit 10(512) | Foreshock Solar Wind | | Bit 11(1024) | Solar Wind Beam | | Bit 12(2048) | High Magnetic Field | | Bit 13(4096) | Average Plasma Sheet | | Bit 14(8192) | Bowshock Crossing | | Bit 15(16384) | Magnetopause Crossing | | Bit 16(32768) | Ground Based Observatories | | Bit 17(65536) | 2-Day Conjunctions | | Bit 18(131072)| 4-Day Conjunctions | +---------------------------------------------------+ ValidMin 0 ValidMax 4294967295 FillValue 4294967295 Support SupportQuantity Other Parameter #5 Name THEMIS-D Spin Right Ascension ParameterKey thd_spinras Description THEMIS-D 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 Parameter #6 Name THEMIS-D Spin Declination ParameterKey thd_spindec Description THEMIS-D 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 Parameter #7 Name THEMIS-D Spin Alpha ParameterKey thd_spinalpha Description THEMIS-D 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 Parameter #8 Name THEMIS-D Spin Beta ParameterKey thd_spinbeta Description THEMIS-D 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 Parameter #9 Name THEMIS-D Spin Period ParameterKey thd_spinper Description THEMIS-D spin period, regularized and boxcar averaged. Units s ValidMin 0.0 ValidMax 30.0 FillValue NaN Support SupportQuantity Temporal Parameter #10 Name THEMIS-D Spin PhaseAngle ParameterKey thd_spinphase Description THEMIS-D 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 Parameter #11 Name THEMIS-D Time ParameterKey thd_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 Parameter #12 Name Spin Correction Time ParameterKey thd_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 Parameter #13 Name THEMIS-D Initial Spin Period ParameterKey thd_spin_spinper Description Initial spin period for segment. Units s ValidMin 0.0 ValidMax 30.0 FillValue NaN Support SupportQuantity Temporal Parameter #14 Name THEMIS-D Spin Time ParameterKey thd_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 Parameter #15 Name THEMIS-D Spin End Time ParameterKey thd_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 Parameter #16 Name THEMIS-D Drift Term ('c') ParameterKey thd_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 Parameter #17 Name THEMIS-D Spin Correction ParameterKey thd_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 Parameter #18 Name Spin Axis Right Ascension Correction ParameterKey thd_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 Parameter #19 Name Spin Axis Declination Correction ParameterKey thd_spindec_correction Description Spin axis declination correction from definitive position and field model Units deg ValidMin -180 ValidMax 180 FillValue NaN Support SupportQuantity Other Parameter #20 Name THEMIS-D Phase Error ParameterKey thd_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 Parameter #21 Name THEMIS-D Spin Number ParameterKey thd_spin_nspins Description Number of spins contained in this segment. ValidMin 0 ValidMax 65535 FillValue 65535 Support SupportQuantity Other Parameter #22 Name THEMIS-D Sample Number ParameterKey thd_spin_npts Description Number of samples (points) contained in this segment. ValidMin 0 ValidMax 65535 FillValue 65535 Support SupportQuantity Other Parameter #23 Name THEMIS-D Pulse Gap ParameterKey thd_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 Parameter #24 Name THEMIS-D Position (GSE) ParameterKey thd_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 Element Name Y GSE Qualifier Component.J Index 2 Element Name Z GSE Qualifier Component.K Index 3 ValidMin -1000000.0 ValidMax 1000000.0 FillValue NaN Support Qualifier Vector SupportQuantity Positional Parameter #25 Name THEMIS-D Position (GSM) ParameterKey thd_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 Element Name Y GSM Qualifier Component.J Index 2 Element Name Z GSM Qualifier Component.K Index 3 ValidMin -1000000.0 ValidMax 1000000.0 FillValue NaN Support Qualifier Vector SupportQuantity Positional Parameter #26 Name THEMIS-D Velocity (GSE) ParameterKey thd_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 Element Name Vy GSE Qualifier Component.J Index 2 Element Name Vz GSE Qualifier Component.K Index 3 ValidMin -1000.0 ValidMax 1000.0 FillValue NaN Support Qualifier Vector SupportQuantity Velocity Parameter #27 Name THEMIS-D Velocity (GSM) ParameterKey thd_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 Element Name Vy GSM Qualifier Component.J Index 2 Element Name Vz GSM Qualifier Component.K Index 3 ValidMin -1000.0 ValidMax 1000.0 FillValue NaN Support Qualifier Vector SupportQuantity Velocity