2.7.1 https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions spase://NASA/NumericalData/THEMIS/C/Ephemeris/PT01M NASA NumericalData THEMIS-C Level 1 Probe State Data https://doi.org/10.48322/8c98-ds28 2025-12-04T13:31:43Z 2021-04-27T15:38:11 Only known prior ReleaseDate of the metadata 2025-10-21T12:34:56.789 Revised ObservedRegion. JMW 2025-11-14T16:02:56Z 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 2025-12-04T13:31:43Z Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB 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. NASA Contract NAS5-02099 Angelopoulos, Vassilis 2025-11-14T16:02:56Z Space Physics Data Facility spase://SMWG/Person/Vassilis.Angelopoulos PrincipalInvestigator THEMIS Data Overview http://themis.ssl.berkeley.edu/overview_data.shtml Overview of THEMIS data, descriptions, and data policy. THEMIS Data Policy and Credits http://themis.ssl.berkeley.edu/roadrules.shtml Details on THEMIS data policy and giving proper credits in publications. THEMIS Ephemeris Format Definition https://spdf.gsfc.nasa.gov/pub/data/themis/documents/tdas/docs/thm_ogs_431m_ephemeris_format_definition.pdf Ephemeris file format and quantity details including RoI descriptions. spase://VMO/NumericalData/THEMIS/C/Ephemeris/PT01M spase://VSPO/NumericalData/THEMIS/C/Ephemeris/PT01M spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb Online Open https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products FTPS from SPDF (not with most browsers) ftps://spdf.gsfc.nasa.gov/pub/data/themis/thc/l1/state/ NASA/GSFC CDAWeb ftp access to the data. HTTPS from SPDF https://spdf.gsfc.nasa.gov/pub/data/themis/thc/l1/state/ In CDF via HTTP from SPDF CDF None spase://SMWG/Repository/UCB/THEMIS Online Open CDAWeb https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=THC_L1_STATE&index=sp_phys THC_L1_STATE Access to ASCII, CDF, and plots via NASA/GSFC CDAWeb SSCWeb https://sscweb.gsfc.nasa.gov/cgi-bin/Locator.cgi themisc THEMIS L1 state data at UC Berkeley http://themis.ssl.berkeley.edu/data/themis/thc/l1/state/ CDF data files for download, organized by date. CDF None https://cdaweb.gsfc.nasa.gov/pub/data/themis/thc/l1/state/$Y thc_l1_state_$Y$m$d_$v.cdf spase://SMWG/Repository/NASA/GSFC/SPDF Online Open CDAWeb Programmatic Data Access https://cdaweb.gsfc.nasa.gov/WS/cdasr/1/dataviews/sp_phys/datasets/THC_L1_STATE/clientLibraryExample/ THC_L1_STATE Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS. Binary spase://SMWG/Repository/NASA/GSFC/SPDF Online Open SSCWeb Programmatic Data Access https://sscweb.gsfc.nasa.gov/WS/sscr/2/observatories/THC_L1_STATE/clientLibraryExample/ THC_L1_STATE Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS. Binary spase://SMWG/Repository/NASA/GSFC/SPDF Online Open 4D Orbit Viewer https://sscweb.gsfc.nasa.gov/4dorbit/?sc=THC_L1_STATE THC_L1_STATE 4D viewer for this data. Note: this AccessInformation element was added by HDPWS. HTML spase://SMWG/Repository/NASA/GSFC/SPDF Online Open https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products CDAWeb HAPI Server https://cdaweb.gsfc.nasa.gov/hapi THC_L1_STATE@0 THC_L1_STATE@1 THC_L1_STATE@2 Web Service to this product using the HAPI interface. CSV Uncalibrated Level 1 v3 spase://SMWG/Instrument/THEMIS/C/Ephemeris Ephemeris 2007-02-17T23:35:58 -P7D PT01M Heliosphere.NearEarth Earth.Magnetosphere.Magnetotail Earth.Magnetosphere.Main Earth.Magnetosheath Earth.Magnetosphere Earth.Magnetosphere.RadiationBelt Typical cadence is 1 min, occasionally 3s. THEMIS-C Position (GEI) thc_pos THEMIS-C position vector (km) in GEI coordinates. km 1e3>m Cartesian GEI 3 X GEI Component.I 1 Y GEI Component.J 2 Z GEI Component.K 3 -1000000.0 1000000.0 NaN Vector Positional THEMIS-C Velocity (GEI) thc_vel THEMIS-C velocity vector (km/s) in GEI coordinates. km/s 1e3>m/s Cartesian GEI 3 Vx GEI Component.I 1 Vy GEI Component.J 2 Vz GEI Component.K 3 -1000.0 1000.0 NaN Vector Velocity THEMIS-C Maneuver Flag thc_man THEMIS-C 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 0 4294967295 4294967295 Other THEMIS-C RoI thc_roi 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. +---------------------------------------------------+ | 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 | +---------------------------------------------------+ 0 4294967295 4294967295 Other THEMIS-C Spin Right Ascension thc_spinras THEMIS-C spin axis right ascension in GEI coordinates. Measured from GEI x-axis towards GEI y-axis. deg Spherical GEI 0.0 360.0 NaN DirectionAngle.AzimuthAngle Positional THEMIS-C Spin Declination thc_spindec THEMIS-C spin axis declination in GEI coordinates. Measured from GEI x-y axis towards GEI z-axis. deg Spherical GEI -90.0 90.0 NaN DirectionAngle.ElevationAngle Positional THEMIS-C Spin Alpha thc_spinalpha THEMIS-C spin axis azimuth, Euler alpha, in Probe Geometric (SPG) coordinates deg Spherical SC 0.0 360.0 NaN DirectionAngle.AzimuthAngle Positional THEMIS-C Spin Beta thc_spinbeta THEMIS-C spin axis colatitude, Euler beta, in Probe Geometric (SPG) coordinates deg Spherical SC 0.0 180.0 NaN DirectionAngle.PolarAngle Positional THEMIS-C Spin Period thc_spinper THEMIS-C spin period, regularized and boxcar averaged. s 0.0 30.0 NaN Temporal THEMIS-C Spin PhaseAngle thc_spinphase THEMIS-C angle rotated since the sun sensor registered the sun pulse, regularized and boxcar averaged. deg 0.0 360.0 NaN PhaseAngle Positional THEMIS-C Time thc_state_time Time, UTC, in seconds since 01-Jan-1970 00:00:00. Not including leap seconds. s 0.0 5.0E9 NaN Temporal Spin Correction Time thc_spin_correction_time Spin correction time, UTC, in seconds since 01-Jan-1970 00:00:00 Unleaped seconds s 0.0 5.0E9 NaN Temporal THEMIS-C Initial Spin Period thc_spin_spinper Initial spin period for segment. s 0.0 30.0 NaN Temporal THEMIS-C Spin Time thc_spin_time Spin time, UTC, in seconds since 01-Jan-1970 00:00:00. Not including leap seconds. s 0.0 5.0E9 NaN Temporal THEMIS-C Spin End Time thc_spin_tend Segment end time, UTC, in seconds since 01-Jan-1970 00:00:00 Not including leap seconds s 0.0 5.0E9 NaN Temporal THEMIS-C Drift Term ('c') thc_spin_c Drift term for spin rate Applies to angular velocity (deg/sec), not spin period. deg/s^2 -30.0 30.0 NaN Other THEMIS-C Spin Correction thc_spin_correction Spin phase correction from definitive position and field model calculated at 1 minute intervals deg -180.0 180.0 NaN DirectionAngle Other Spin Axis Right Ascension Correction thc_spinras_correction Spin axis right ascension correction from definitive position and field model deg -180 180 NaN Other Spin Axis Declination Correction thc_spindec_correction Spin axis declination correction from definitive position and field model deg -180 180 NaN Other THEMIS-C Phase Error thc_spin_phaserr Maximum absolute phase error between model and non-outlier sun crossing time. Errors due to recognized BAU timing errors do not contribute to this quantity. s 0.0 30.0 NaN Uncertainty Temporal THEMIS-C Spin Number thc_spin_nspins Number of spins contained in this segment. 0 65535 65535 Other THEMIS-C Sample Number thc_spin_npts Number of samples (points) contained in this segment. 0 65535 65535 Other THEMIS-C Pulse Gap thc_spin_maxgap Duration, in seconds, of longest gap between sun pulses in this segment. Long gaps (60 sec or more) will generally indicate shadow periods. s 0.0 86400.0 NaN Temporal THEMIS-C Position (GSE) thc_pos_gse Spacecraft position vector (km) in GSE coordinates. PT01M km 1e3>m Cartesian GSE 3 X GSE Component.I 1 Y GSE Component.J 2 Z GSE Component.K 3 -1000000.0 1000000.0 NaN Vector Positional THEMIS-C Position (GSM) thc_pos_gsm Spacecraft position vector (km) in GSM coordinates. PT01M km 1e3>m Cartesian GSM 3 X GSM Component.I 1 Y GSM Component.J 2 Z GSM Component.K 3 -1000000.0 1000000.0 NaN Vector Positional THEMIS-C Velocity (GSE) thc_vel_gse Spacecraft velocity (km/s) in GSE coordinates. PT01M km/s 1e3>m/s Cartesian GSE 3 Vx GSE Component.I 1 Vy GSE Component.J 2 Vz GSE Component.K 3 -1000.0 1000.0 NaN Vector Velocity THEMIS-C Velocity (GSM) thc_vel_gsm Spacecraft velocity (km/s) in GSM coordinates. PT01M km/s 1e3>m/s Cartesian GSM 3 Vx GSM Component.I 1 Vy GSM Component.J 2 Vz GSM Component.K 3 -1000.0 1000.0 NaN Vector Velocity