2.2.2 spase://VMO/NumericalData/THEMIS/E/Ephemeris/PT01M THEMIS-E Level 1 Probe State Data 2010-05-14T21:45:29Z 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 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 ftp://apollo.ssl.berkeley.edu/pub/THEMIS/3 Ground Systems/3.2 Science Operations/Science Operations Documents/thm_ogs_431m_ephemeris_format_definition.pdf Ephemeris file format and quantity details including RoI descriptions. spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb Online Open FTP access to files at SPDF ftp://spdf.gsfc.nasa.gov/pub/data/themis/the/l1/state NASA/GSFC CDAWeb ftp access to the data. HTTP access to files at SPDF http://spdf.gsfc.nasa.gov/pub/data/themis/the/l1/state In CDF via HTTP from SPDF CDAWeb http://cdaweb.gsfc.nasa.gov THE_L1_STATE Access to ASCII, CDF, and plots via NASA/GSFC CDAWeb SSCWeb http://sscweb.gsfc.nasa.gov/cgi-bin/Locator.cgi themise CDF None spase://SMWG/Repository/UCB/THEMIS Online Open THEMIS L1 state data at UC Berkeley http://themis.ssl.berkeley.edu/data/themis/the/l1/state CDF data files for download, organized by date. CDF None Uncalibrated Level 1 v3 spase://SMWG/Instrument/THEMIS/E/Ephemeris Ephemeris 2007-02-17T23:35:58 -P7D PT01M Heliosphere.NearEarth Earth.Magnetosphere.Magnetotail Earth.Magnetosphere.Main Earth.Magnetosheath Typical cadence is 1 min, occasionally 3s. THEMIS-E Position (GEI) the_pos THEMIS-E 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-E Velocity (GEI) the_vel THEMIS-E 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-E Maneuver Flag the_man THEMIS-E 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-E RoI the_roi Region of interest. Different bits of this parameter give a general indication of the region thet 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-E Spin Right Ascension the_spinras THEMIS-E 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-E Spin Declination the_spindec THEMIS-E 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-E Spin Alpha the_spinalpha THEMIS-E spin axis azimuth, Euler alpha, in Probe Geometric (SPG) coordinates deg Spherical SC 0.0 360.0 NaN DirectionAngle.AzimuthAngle Positional THEMIS-E Spin Beta the_spinbeta THEMIS-E spin axis colatitude, Euler beta, in Probe Geometric (SPG) coordinates deg Spherical SC 0.0 180.0 NaN DirectionAngle.PolarAngle Positional THEMIS-E Spin Period the_spinper THEMIS-E spin period, regularized and boxcar averaged. s 0.0 30.0 NaN Temporal THEMIS-E Spin PhaseAngle the_spinphase THEMIS-E angle rotated since the sun sensor registered the sun pulse, regularized and boxcar averaged. deg 0.0 360.0 NaN PhaseAngle Positional THEMIS-E Time the_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 the_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-E Initial Spin Period the_spin_spinper Initial spin period for segment. s 0.0 30.0 NaN Temporal THEMIS-E Spin Time the_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-E Spin End Time the_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-E Drift Term ('c') the_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-E Spin Correction the_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 the_spinras_correction Spin axis right ascension correction from definitive position and field model deg -180 180 NaN Other Spin Axis Declination Correction the_spindec_correction Spin axis declination correction from definitive position and field model deg -180 180 NaN Other THEMIS-E Phase Error the_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-E Spin Number the_spin_nspins Number of spins contained in this segment. 0 65535 65535 Other THEMIS-E Sample Number the_spin_npts Number of samples (points) contained in this segment. 0 65535 65535 Other THEMIS-E Pulse Gap the_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-E Position (GSE) the_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-E Position (GSM) the_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-E Velocity (GSE) the_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-E Velocity (GSM) the_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