Data Access
THEMIS-D On Board moments. On board data outputs include number density, particle flux, energy flux, and a six component symetric momentum flux tensor. Other moments are calculated from these partial moments on the ground adding total pressure, velocity, plasma temperature (measured as a three dimensional energy vector), and a six component symetric pressure tensor to the list of data products. Number density and total pressure are scalar outputs. Velocity is calculated in DSL, GSE, GSM, and MFA coordinates (coordinate descriptions are listed below in Table 1). Magnetic Field Aligned pressure tensor and temperature are calculated as well. All quantities are calculated for both ions and electrons from a combination of ESA and SST data. Moments data are taken at spin resolution in all ESA survey modes except burst. The spacecraft potential, as measure by the EFI, is used to correct for spacecraft charging by shifting the particle energies for calculation; this eliminates contamination from photo-electrons. Also, weighting factors are used to account for instrument specific energy and angle efficiency variations.
Table 1: Coordinate Descriptions.
Despun Sun - L-vector (DSL): Z-axis points towards the spin axis, the Y-axis is obtained from the cross product of Z and the Spacecraft-Sun direction as viewed from the probe. The X-axis sits in the Z-axis-Sun plane and completes a right handed system.
Geocentric Solar Ecliptic (GSE): Z-axis is normal to the solar ecliptic, the X-axis points from earth towards the Sun, and Y complets a right handed system.
Geocentric solar Magnetosphereic (GSM): X-axis points from Earth to the Sun, the Y-axis is orthogonal to the Earth's magnetic dipole and points towards the dusk side, and the X-Z plane contains the dipole axis.
Magnetic Field Aligned (MFA): Z-axis points along magnetic field lines, the Y-axis is the orthonormal cross product of the Z-axis and a vector pointing towards the Sun, and the X-axis completes the right handed system.Version:2.2.9
THEMIS-D On Board moments. On board data outputs include number density, particle flux, energy flux, and a six component symetric momentum flux tensor. Other moments are calculated from these partial moments on the ground adding total pressure, velocity, plasma temperature (measured as a three dimensional energy vector), and a six component symetric pressure tensor to the list of data products. Number density and total pressure are scalar outputs. Velocity is calculated in DSL, GSE, GSM, and MFA coordinates (coordinate descriptions are listed below in Table 1). Magnetic Field Aligned pressure tensor and temperature are calculated as well. All quantities are calculated for both ions and electrons from a combination of ESA and SST data. Moments data are taken at spin resolution in all ESA survey modes except burst. The spacecraft potential, as measure by the EFI, is used to correct for spacecraft charging by shifting the particle energies for calculation; this eliminates contamination from photo-electrons. Also, weighting factors are used to account for instrument specific energy and angle efficiency variations.
Table 1: Coordinate Descriptions.
Despun Sun - L-vector (DSL): Z-axis points towards the spin axis, the Y-axis is obtained from the cross product of Z and the Spacecraft-Sun direction as viewed from the probe. The X-axis sits in the Z-axis-Sun plane and completes a right handed system.
Geocentric Solar Ecliptic (GSE): Z-axis is normal to the solar ecliptic, the X-axis points from earth towards the Sun, and Y complets a right handed system.
Geocentric solar Magnetosphereic (GSM): X-axis points from Earth to the Sun, the Y-axis is orthogonal to the Earth's magnetic dipole and points towards the dusk side, and the X-Z plane contains the dipole axis.
Magnetic Field Aligned (MFA): Z-axis points along magnetic field lines, the Y-axis is the orthonormal cross product of the Z-axis and a vector pointing towards the Sun, and the X-axis completes the right handed system.| Role | Person | |
|---|---|---|
| 1. | PrincipalInvestigator | spase://SMWG/Person/Vassilis.Angelopoulos |
| 2. | CoInvestigator | spase://SMWG/Person/Charles.W.Carlson |
| 3. | CoInvestigator | spase://SMWG/Person/James.P.McFadden |
NASA/GSFC CDAWeb ftp access to the data.
NASA/GSFC CDAWeb http access to the data.
Access to ASCII, CDF, and plots via NASA/GSFC CDAWeb
CDF data files for download, organized by date.
0 = good data, 1 = missing S/C potential, 2 = electron density greater than 2ion density, 3 = ion density greater than 2electron density
0 = good data, 1 = missing S/C potential, 2 = electron density greater than 2ion density, 3 = ion density greater than 2electron density
ESA Scalar ion number density calculated on board the spacecraft.
Total ion pressure calculated on the ground from on board moments.
ESA ion particle flux vector (in DSL coordinates) calculated on board the spacecraft.
ESA ion momentum flux tensor (in DSL coordinates) calculated on board the spacecraft (six-component, off-diagonal terms are symetric).
ESA Ion energy flux vector (in DSL coordinates) calculated on board the spacecraft.
ESA Ion velocity vector (in DSL coordinates, see chart in data description) calculated on the ground from spacecraft moments.
ESA Ion velocity vector (in GSE coordinates, see chart in data description) calculated on the ground from spacecraft moments.
ESA Ion velocity vector (in GSM coordinates, see chart in data description) calculated on the ground from spacecraft moments.
ESA Ion pressure tensor (in DSL coordinates, see chart in data description) calculated on the ground from spacecraft moments.
Magnetic field vector in DSL coordinates (same time array as MOM Ion ESA data); for calculated of field aligned moments.
ESA Ion velocity vector in magnetic field aligned coordinates; calculated on the ground from spacecraft moments.
Ion Temperature, Field Aligned (TprpFA1, TprpFA2, TparFA)
Ion Pressure Tensor, Field Aligned
thd_peim_time, UTC, in seconds since 01-Jan-1970 00:00:00; marks center time of data sample.
ESA electron density calculated on board the spacecraft.
ESA Electron total pressure calculated on the ground from spacecraft moments.
ESA Electron particle flux vector (in DSL coordinates) calculated on board the spacecraft.
ESA Electron momentum flux tensor (in DSL coordinates) calculated on board the spacecraft.
ESA Electron energy flux vector (in DSL coordinates) calculated on board the spacecraft.
ESA Electron velocity vectors (in DSL coordinates) calculated on the ground from spacecraft moments.
ESA Electron velocity vector (in GSE coordinates) calculated on the ground from spacecraft moments.
ESA Electron velocity vector (in GSM coordinates) calculated on the ground from spacecraft moments.
ESA Electron pressure tensor (in DSL coordinates) calculated on the ground from spacecraft moments.
Magnetic Field Vector in DSL coordinates (same time array as MOM Electron ESA data); for calculation of field-aligned moments.
ESA Electron velocity vector in magnetic field aligned coordinates; calculated on the ground from spacecraft moments.
Three dimentional electron temperature in magnetic field aligned coordinates; calculated on the ground from spacecraft moments. (TprpFA1, TprpFA2, TparFA)
ESA Electron pressure tensor in magnetic field aligned coordinates; calculated on the ground from spacecraft moments.
thd_peem_time, UTC, in seconds since 01-Jan-1970 00:00:00; marks center time of data sample.
Spacecraft potential as measured by the EFI.
thd_pxxm_time, UTC, in seconds since 01-Jan-1970 00:00:00; marks center time of data sample.