THEMIS-E: ESA electron/ion energy fluxes and moments

https://doi.org/10.48322/ma73-rz55

2023-07-30 12:34:56.789

THEMIS-E: Electrostatic Analyzers (ESA): Electron/Ion Ground-Calculated Energy Fluxes (5eV - 25 keV for Ions and 6eV - 30 KeV for Electrons) and Moments (density, velocity, pressure, and temperature). The satellite has 2 modes Fast and Slow survey and 3 data types: FULL, REDUCED and BURST. FULL: 88 angles x 32 energies, time resolution of 128 spins(395 seconds) in slow survey and 32 spins(98 seconds) in fast survey. REDUCED: spin time resolution(3 sec) but angles averaged into 1 angular spectra x 32 energies in slow survey or 6 angular spectra(90 degree x 90 degree window) x 32 energies in fast survey. BURST: 88 angles x 32 energies and spin time resolution(3 sec) but only available sporadically and for short duration. Note that angular resolution affects moments since they are obtained integrating over the mode-specific angular distribution. These moments are processed on the ground. They should be regarded as approximations but will improve in quality as our processing routines are improved over the course of the mission to account for additional sources of variance.

NASA contract NAS5-02099 and V. Angelopoulos for use of data from the THEMIS Mission. Specifically: C. W. Carlson and J. P. McFadden for use of ESA data.

spase://VMO/NumericalData/THEMIS-E/ESA/PT3S

spase://VMO/NumericalData/THEMIS/E/ESA/PT3S

spase://VSPO/NumericalData/THEMIS/E/ESA/PT3S

Online

Open

CDF

None

Online

Open

CSV

ESA Full Mode, Ion Density

the_peif_density

ESA Ion Density from full angle distribution.

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

cm^-3

1.0e6>m^-3

0.0

1.0E10

NaN

ESA Ion Average Temperature: Full Distribution

the_peif_avgtemp

ESA Ion Average Temperature from full angle distribution.

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

eV

1.60217653e-19>J

0.0

1.0E10

NaN

ESA Ion Thermal Velocity: Full Distribution

the_peif_vthermal

ESA Ion Thermal Velocity from full angle distribution.

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

km/s

1.0e3>m/s

0.0

1.0E10

NaN

SC Potential at full distribution cadence

the_peif_sc_pot

The Spacecraft Potential that was used for calculating the moments that were generated from the full angle distribution. This parameter was taken from the efi data and interpolated to the cadence of the esa full distribution data.

This spacecraft potential parameter is the current best estimate of the spacecraft potential, estimates will improve as the mission continues. Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe. EFI booms for THEMIS E(P4) were deployed on 2007-06-07/19:00:00 UT. Before this time this spacecraft potential was not calculated accurately.

PT98S

V

0.0

1.0E10

NaN

ESA Ion energy spectrogram: full distribution

the_peif_en_eflux

ESA Ion energy spectrogram energy flux calculated from full angle distribution.

Energy levels of eflux bins are stored in the_peif_en_eflux_yaxis. Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

eV/(cm^2*s*sr*eV)

1e4>1/(m^2*s*sr)

the_peif_en_eflux_yaxis: full distribution

the_peif_en_eflux_yaxis

Energy level of energy bins for the_peif_en_eflux

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

eV

1.60217653e-19>J

the_peif_t3

the_peif_t3

Ion temperature eigenvalues of the diagonalized pressure tensor calculated from the full angle distribution. Includes two perpendicular elements and one parallel element. (Tprp1_ion, Tprp2_ion, Tpar_ion)

The first eigenvalue and eigenvector are the distinguisheable eigenvalue and the major (symmetry) axis, respectively. .The "degenerate" eigenvalues are sorted such that the 2nd eigenvalue is smaller than the third one. Coordinate system is ostensibly magnetic field aligned but may deviate if the particle distribution is strongly isotropic. Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

eV

1.60217653e-19>J

the_peif_magt3

the_peif_magt3

Temperature eigenvalues of the diagonalized pressure tensor corrected to align with magnetic field using FGM data. Calculated from full angle distribution. Includes two perpendicular elements and one parallel element. (Tprp1_ion, Tprp2_ion, Tpar_ion)

3d temperatures around magnetic axis (Z) and normal axes (X,Y), where Y is Z direction crosed into Sun direction, and X completes orthogonal system. Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

eV

1.60217653e-19>J

Ion Pressure Tensor: Full Distribution

the_peif_ptens

Ion pressure tensor calculated from full angle distribution. Elements from symmetric ion pressure covariance matrix.

Only 6 elements are provided since matrix is symmetrical. Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

eV/cm^3

1.60217653e-13>Pa

Ion Momentum Flux Tensor: Full Distribution

the_peif_mftens

Ion Momentum Flux Tensor calculated from full angle distribution. Elements from symmetric ion momentum flux matrix.

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

eV/cm^3

1.60217653e-13>Pa

Ion Particle Flux Vector: Full Distribution

the_peif_flux

Ion Particle Flux Vector calculated from full angle distribution.

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

#/(cm^2*s)

1e4>#/(m^2*s)

Ion Symmetry Vector: Full Distribution

the_peif_symm

Ion Symmetry Vector is the direction of pressure tensor(peif_ptens) symmetry in despun spacecraft coordinates. This parameter is calculated from the full angle distibution quantities.

This is the direction vector of the principal axis of the pressure tensor in despun spacecraft coordinates. Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

None

Ion Symmetry Angle (between symmetry direction and B): Full Distribution

the_peif_symm_ang

Ion Symmetry Angle between symmetry direction and B. Can also be treated as the angle between the z axes of the peif_t3 and the peif_magt3 quantities. Calculated from the full angle distribution quantities.

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

degrees

0.0

90.0

NaN

Magnetic Field Vector SC: Full Distribution/Ion

the_peif_magf

Magnetic Field Vector in despun spacecraft coordinates. This quantity was the quantity used to calculate the full distribution moments. It was taken from the FGM data and interpolated to match the cadence of the full distribution ESA data.

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

nT

1.0e-9>T

Ion Velocity Vector SC: Full Distribution

the_peif_velocity_dsl

Ion Velocity Vector in Despun spacecraft coordinates. Calculated from full distribution.

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

km/s

1.0e3>m/s

Ion Velocity Vector in GSE: Full Distribution

the_peif_velocity_gse

Ion Velocity Vector in GSE coordinates. Calculated from full angle distribution.

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

km/s

1.0e3>m/s

Ion Velocity Vector in GSM: Full Distribution

the_peif_velocity_gsm

Ion Velocity Vector in GSM coordinates. Calculated from full angle distribution.

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

km/s

1.0e3>m/s

the_peif_time

the_peif_time

the_peif_time, UTC, in seconds since 01-Jan-1970 00:00:00; marks center time of data sample. These are used as the sample times for the ESA full distribution data

Unleaped seconds. Sample start and end time can be calculated from the_peif_delta_time (sample duration). Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

sec

0.0

5.0E9

NaN

the_peif_delta_time

the_peif_delta_time

Duration in seconds of sample. In otherwords cadence of the full distribution samples.

sec

0.0

100000.0

NaN

the_peif_mode

the_peif_mode

Ion survey mode, controls angle and energy binning, and time resolution, values of 0 to 8

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

none

the_peif_epoch0

the_peif_epoch0

EPOCH of THEMIS time base

EPOCH of 01-Jan-1970 00:00:00

msec

1.0e-3>sec

ESA Full Mode, Electron Density

the_peef_density

ESA Electron Density from full angle distribution.

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT98S

cm^-3

1.0e6>m^-3

0.0

1.0E10

NaN

ESA Electron Average Temperature: Full Distribution

the_peef_avgtemp

ESA Electron Average Temperature from full angle distribution.

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT98S

eV

1.60217653e-19>J

0.0

1.0E10

NaN

ESA Electron Thermal Velocity: Full Distribution

the_peef_vthermal

ESA Electron Thermal Velocity from full angle distribution.

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT98S

km/s

1.0e3>m/s

0.0

1.0E10

NaN

SC Potential at full distribution cadence

the_peef_sc_pot

The Spacecraft Potential that was used for calculating the moments that were generated from the full angle distribution. This parameter was taken from the efi data and interpolated to the cadence of the esa full distribution data.

This spacecraft potential parameter is the current best estimate of the spacecraft potential, estimates will improve as the mission continues. Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe. EFI booms for THEMIS E(P4) were deployed on 2007-06-07/19:00:00 UT. Before this time this spacecraft potential was not calculated accurately and will not be available.

PT98S

V

0.0

1.0E10

NaN

ESA Electron energy spectrogram: full distribution

the_peef_en_eflux

ESA Electron energy spectrogram energy flux calculated from full angle distribution.

Energy levels of eflux bins are stored in the_peef_en_eflux_yaxis. Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

eV/(cm^2*s*sr*eV)

1e4>1/(m^2*s*sr)

the_peef_en_eflux_yaxis: full distribution

the_peef_en_eflux_yaxis

Energy level of energy bins for the_peef_en_eflux

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

eV

1.60217653e-19>J

Electron Diagonalized Temperature

the_peef_t3

Electron temperature eigenvalues of the diagonalized pressure tensor calculated from the full angle distribution. Includes two perpendicular elements and one parallel element. (Tprp1_elec, Tprp2_elec, Tpar_elec)

The first eigenvalue and eigenvector are the distinguisheable eigenvalue and the major (symmetry) axis, respectively. .The "degenerate" eigenvalues are sorted such that the 2nd eigenvalue is smaller than the third one. Coordinate system is ostensibly magnetic field aligned but may deviate if the particle distribution is strongly isotropic. Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT98S

eV

1.60217653e-19>J

Electron Diagonalized Temperature, Field Aligned

the_peef_magt3

Temperature eigenvalues of the diagonalized pressure tensor corrected to align with magnetic field using FGM data. Calculated from full angle distribution. Includes two perpendicular elements and one parallel element. (Tprp1_elec, Tprp2_elec, Tpar_elec)

3d temperatures around magnetic axis (Z) and normal axes (X,Y), where Y is Z direction crosed into Sun direction, and X completes orthogonal system. Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT98S

eV

1.60217653e-19>J

Electron Pressure Tensor: Full Distribution

the_peef_ptens

Electron pressure tensor calculated from full angle distribution. Elements from symmetric electron pressure covariance matrix.

Only 6 elements are provided since matrix is symmetrical. Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT98S

eV/cm^3

1.60217653e-13>Pa

Electron Momentum Flux Tensor: Full Distribution

the_peef_mftens

Electron Momentum Flux Tensor calculated from full angle distribution. Elements from symmetric electron momentum flux matrix.

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT98S

eV/cm^3

1.60217653e-13>Pa

Electron Particle Flux Vector: Full Distribution

the_peef_flux

Electron Particle Flux Vector calculated from full angle distribution.

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT98S

#/(cm^2*s)

1e4>#/(m^2*s)

Electron Symmetry Vector: Full Distribution

the_peef_symm

Electron Symmetry Vector is the direction of pressure tensor(peef_ptens) symmetry in despun spacecraft coordinates. This parameter is calculated from the full angle distibution quantities.

This is the direction vector of the principal axis of the pressure tensor in despun spacecraft coordinates. Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT98S

None

Electron Symmetry Angle (between symmetry direction and B): Full Distribution

the_peef_symm_ang

Electron Symmetry Angle between symmetry direction and B. Can also be treated as the angle between the z axes of the peef_t3 and the peef_magt3 quantities. Calculated from the full angle distribution quantities.

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT98S

degrees

0.0

90.0

NaN

Magnetic Field Vector SC: Full Distribution/Electron

the_peef_magf

Magnetic Field Vector in despun spacecraft coordinates. This quantity was the quantity used to calculate the full distribution moments. It was taken from the FGM data and interpolated to match the cadence of the full distribution ESA data.

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

nT

1.0e-9>T

Electron Velocity Vector SC: Full Distribution

the_peef_velocity_dsl

Electron Velocity Vector in Despun spacecraft coordinates. Calculated from full distribution.

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT98S

km/s

1.0e3>m/s

Electron Velocity Vector in GSE: Full Distribution

the_peef_velocity_gse

Electron Velocity Vector in GSE coordinates. Calculated from full angle distribution.

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT98S

km/s

1.0e3>m/s

Electron Velocity Vector in GSM: Full Distribution

the_peef_velocity_gsm

Electron Velocity Vector in GSM coordinates. Calculated from full angle distribution.

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT98S

km/s

1.0e3>m/s

the_peef_time

the_peef_time

the_peef_time, UTC, in seconds since 01-Jan-1970 00:00:00; marks center time of data sample. These are used as the sample times for the ESA full distribution data

Unleaped seconds. Sample start and end time can be calculated from the_peef_delta_time (sample duration). Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

sec

0.0

5.0E9

NaN

the_peef_delta_time

the_peef_delta_time

Duration in seconds of sample. In otherwords cadence of the full distribution samples.

sec

0.0

100000.0

NaN

the_peef_mode

the_peef_mode

Electron survey mode, controls angle and energy binning, and time resolution, values of 0 to 8

Some of the data are at a cadence of 395 seconds, cadences switch due to mode changes on the probe.

PT98S

none

the_peef_epoch0

the_peef_epoch0

EPOCH of THEMIS time base

EPOCH of 01-Jan-1970 00:00:00

msec

1.0e-3>sec

ESA Reduced Mode, Ion Density

the_peir_density

ESA Ion Density from reduced angle distribution.

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

cm^-3

1.0e6>m^-3

0.0

1.0E10

NaN

ESA Ion Average Temperature: Reduced Distribution

the_peir_avgtemp

ESA Ion Average Temperature from reduced angle distribution.

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

eV

1.60217653e-19>J

0.0

1.0E10

NaN

ESA Ion Thermal Velocity: Reduced Distribution

the_peir_vthermal

ESA Ion Thermal Velocity from reduced angle distribution.

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

km/s

1.0e3>m/s

0.0

1.0E10

NaN

SC Potential at reduced distribution cadence

the_peir_sc_pot

The Spacecraft Potential that was used for calculating the moments that were generated from the reduced angle distribution. This parameter was taken from the efi data and interpolated to the cadence of the esa reduced distribution data.

This spacecraft potential parameter is the current best estimate of the spacecraft potential, estimates will improve as the mission continues. Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used. EFI booms for THEMIS E(P4) were deployed on 2007-06-07/19:00:00 UT. Before this time this spacecraft potential was not calculated accurately and will not be available.

PT3S

V

0.0

1.0E10

NaN

ESA Ion energy spectrogram: reduced distribution

the_peir_en_eflux

ESA Ion energy spectrogram energy flux calculated from reduced angle distribution.

Energy levels of eflux bins are stored in the_peir_en_eflux_yaxis. Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

eV/(cm^2*s*sr*eV)

1e4>1/(m^2*s*sr)

the_peir_en_eflux_yaxis: reduced distribution

the_peir_en_eflux_yaxis

Energy level of energy bins for the_peir_en_eflux

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

eV

1.60217653e-19>J

Ion Diagonalized Temperature: reduced angle distribution

the_peir_t3

Ion temperature eigenvalues of the diagonalized pressure tensor calculated from the reduced angle distribution. Includes two perpendicular elements and one parallel element. (Tprp1_ion, Tprp2_ion, Tpar_ion)

The first eigenvalue and eigenvector are the distinguisheable eigenvalue and the major (symmetry) axis, respectively. .The "degenerate" eigenvalues are sorted such that the 2nd eigenvalue is smaller than the third one. Coordinate system is ostensibly magnetic field aligned but may deviate if the particle distribution is strongly isotropic. Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

eV

1.60217653e-19>J

Ion Diagonalized Temperature, Field Aligned: reduced angle distribution

the_peir_magt3

Temperature eigenvalues of the diagonalized pressure tensor corrected to align with magnetic field using FGM data. Calculated from reduced angle distribution. Includes two perpendicular elements and one parallel element. (Tprp1_ion, Tprp2_ion, Tpar_ion)

3d temperatures around magnetic axis (Z) and normal axes (X,Y), where Y is Z direction crosed into Sun direction, and X completes orthogonal system. Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

eV

1.60217653e-19>J

Ion Pressure Tensor: Reduced Distribution

the_peir_ptens

Ion pressure tensor calculated from reduced angle distribution. Elements from symmetric ion pressure covariance matrix.

Only 6 elements are provided since matrix is symmetrical. Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

eV/cm^3

1.60217653e-13>Pa

Ion Momentum Flux Tensor: Reduced Distribution

the_peir_mftens

Ion Momentum Flux Tensor calculated from reduced angle distribution. Elements from symmetric ion momentum flux matrix.

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

eV/cm^3

1.60217653e-13>Pa

Ion Particle Flux Vector: Reduced Distribution

the_peir_flux

Ion Particle Flux Vector calculated from reduced angle distribution.

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

#/(cm^2*s)

1e4>#/(m^2*s)

Ion Symmetry Vector: Reduced Distribution

the_peir_symm

Ion Symmetry Vector is the direction of pressure tensor(peir_ptens) symmetry in despun spacecraft coordinates. This parameter is calculated from the reduced angle distibution quantities.

This is the direction vector of the principal axis of the pressure tensor in despun spacecraft coordinates. Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

None

Ion Symmetry Angle (between symmetry direction and B): Reduced Distribution

the_peir_symm_ang

Ion Symmetry Angle between symmetry direction and B. Can also be treated as the angle between the z axes of the peir_t3 and the peir_magt3 quantities. Calculated from the reduced angle distribution quantities.

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

degrees

0.0

90.0

NaN

Magnetic Field Vector SC: Reduced Distribution/Ion

the_peir_magf

Magnetic Field Vector in despun spacecraft coordinates. This quantity was the quantity used to calculate the reduced distribution moments. It was taken from the FGM data and interpolated to match the cadence of the reduced distribution ESA data.

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

nT

1.0e-9>T

Ion Velocity Vector SC: Reduced Distribution

the_peir_velocity_dsl

Ion Velocity Vector in Despun spacecraft coordinates. Calculated from reduced distribution.

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

km/s

1.0e3>m/s

Ion Velocity Vector in GSE: Reduced Distribution

the_peir_velocity_gse

Ion Velocity Vector in GSE coordinates. Calculated from reduced angle distribution.

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

km/s

1.0e3>m/s

Ion Velocity Vector in GSM: Reduced Distribution

the_peir_velocity_gsm

Ion Velocity Vector in GSM coordinates. Calculated from reduced angle distribution.

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

km/s

1.0e3>m/s

the_peir_time

the_peir_time

the_peir_time, UTC, in seconds since 01-Jan-1970 00:00:00; marks center time of data sample. These are used as the sample times for the ESA reduced distribution data

Unleaped seconds. Sample start and end time can be calculated from the_peir_delta_time (sample duration). Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

sec

0.0

5.0E9

NaN

the_peir_delta_time

the_peir_delta_time

Duration in seconds of sample. In otherwords cadence of the reduced distribution samples.

sec

0.0

100000.0

NaN

the_peir_mode

the_peir_mode

Ion survey mode, controls angle and energy binning, and time resolution, values of 0 to 8

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

none

the_peir_epoch0

the_peir_epoch0

EPOCH of THEMIS time base

EPOCH of 01-Jan-1970 00:00:00

msec

1.0e-3>sec

ESA Reduced Mode, Electron Density

the_peer_density

ESA Electron Density from reduced angle distribution.

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT3S

cm^-3

1.0e6>m^-3

0.0

1.0E10

NaN

ESA Electron Average Temperature: Reduced Distribution

the_peer_avgtemp

ESA Electron Average Temperature from reduced angle distribution.

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT3S

eV

1.60217653e-19>J

0.0

1.0E10

NaN

ESA Electron Thermal Velocity: Reduced Distribution

the_peer_vthermal

ESA Electron Thermal Velocity from reduced angle distribution.

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT3S

km/s

1.0e3>m/s

0.0

1.0E10

NaN

SC Potential at reduced distribution cadence

the_peer_sc_pot

The Spacecraft Potential that was used for calculating the moments that were generated from the reduced angle distribution. This parameter was taken from the efi data and interpolated to the cadence of the esa reduced distribution data.

This spacecraft potential parameter is the current best estimate of the spacecraft potential, estimates will improve as the mission continues. Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used. EFI booms for THEMIS E(P4) were deployed on 2007-06-07/19:00:00 UT. Before this time this spacecraft potential was not calculated accurately and will not be available.

PT3S

V

0.0

1.0E10

NaN

ESA Electron energy spectrogram: reduced distribution

the_peer_en_eflux

ESA Electron energy spectrogram energy flux calculated from reduced angle distribution.

Energy levels of eflux bins are stored in the_peer_en_eflux_yaxis. Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

eV/(cm^2*s*sr*eV)

1e4>1/(m^2*s*sr)

the_peer_en_eflux_yaxis: reduced distribution

the_peer_en_eflux_yaxis

Energy level of energy bins for the_peer_en_eflux

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

eV

1.60217653e-19>J

Electron Diagonalized Temperature: reduced angle distribution

the_peer_t3

Electron temperature eigenvalues of the diagonalized pressure tensor calculated from the reduced angle distribution. Includes two perpendicular elements and one parallel element. (Tprp1_elec, Tprp2_elec, Tpar_elec)

The first eigenvalue and eigenvector are the distinguisheable eigenvalue and the major (symmetry) axis, respectively. .The "degenerate" eigenvalues are sorted such that the 2nd eigenvalue is smaller than the third one. Coordinate system is ostensibly magnetic field aligned but may deviate if the particle distribution is strongly isotropic. Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT3S

eV

1.60217653e-19>J

Electron Diagonalized Temperature, Field Aligned: reduced angle distribution

the_peer_magt3

Temperature eigenvalues of the diagonalized pressure tensor corrected to align with magnetic field using FGM data. Calculated from reduced angle distribution. Includes two perpendicular elements and one parallel element. (Tprp1_elec, Tprp2_elec, Tpar_elec)

3d temperatures around magnetic axis (Z) and normal axes (X,Y), where Y is Z direction crosed into Sun direction, and X completes orthogonal system. Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT3S

eV

1.60217653e-19>J

Electron Pressure Tensor: Reduced Distribution

the_peer_ptens

Electron pressure tensor calculated from reduced angle distribution. Elements from symmetric electron pressure covariance matrix.

Only 6 elements are provided since matrix is symmetrical. Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT3S

eV/cm^3

1.60217653e-13>Pa

Electron Momentum Flux Tensor: Reduced Distribution

the_peer_mftens

Electron Momentum Flux Tensor calculated from reduced angle distribution. Elements from symmetric electron momentum flux matrix.

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT3S

eV/cm^3

1.60217653e-13>Pa

Electron Particle Flux Vector: Reduced Distribution

the_peer_flux

Electron Particle Flux Vector calculated from reduced angle distribution.

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT3S

#/(cm^2*s)

1e4>#/(m^2*s)

Electron Symmetry Vector: Reduced Distribution

the_peer_symm

Electron Symmetry Vector is the direction of pressure tensor(peer_ptens) symmetry in despun spacecraft coordinates. This parameter is calculated from the reduced angle distibution quantities.

This is the direction vector of the principal axis of the pressure tensor in despun spacecraft coordinates. Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT3S

None

Electron Symmetry Angle (between symmetry direction and B): Reduced Distribution

the_peer_symm_ang

Electron Symmetry Angle between symmetry direction and B. Can also be treated as the angle between the z axes of the peer_t3 and the peer_magt3 quantities. Calculated from the reduced angle distribution quantities.

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT3S

degrees

0.0

90.0

NaN

Magnetic Field Vector SC: Reduced Distribution/Electron

the_peer_magf

Magnetic Field Vector in despun spacecraft coordinates. This quantity was the quantity used to calculate the reduced distribution moments. It was taken from the FGM data and interpolated to match the cadence of the reduced distribution ESA data.

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

nT

1.0e-9>T

Electron Velocity Vector SC: Reduced Distribution

the_peer_velocity_dsl

Electron Velocity Vector in Despun spacecraft coordinates. Calculated from reduced distribution.

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT3S

km/s

1.0e3>m/s

Electron Velocity Vector in GSE: Reduced Distribution

the_peer_velocity_gse

Electron Velocity Vector in GSE coordinates. Calculated from reduced angle distribution.

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT3S

km/s

1.0e3>m/s

Electron Velocity Vector in GSM: Reduced Distribution

the_peer_velocity_gsm

Electron Velocity Vector in GSM coordinates. Calculated from reduced angle distribution.

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used. This quantity will not be available before the THEMIS E(P4) efi boom deployment date: 2007-06-07/19:00:00 UT.

PT3S

km/s

1.0e3>m/s

the_peer_time

the_peer_time

the_peer_time, UTC, in seconds since 01-Jan-1970 00:00:00; marks center time of data sample. These are used as the sample times for the ESA reduced distribution data

Unleaped seconds. Sample start and end time can be calculated from the_peer_delta_time (sample duration). Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

sec

0.0

5.0E9

NaN

the_peer_delta_time

the_peer_delta_time

Duration in seconds of sample. In otherwords cadence of the reduced distribution samples.

sec

0.0

100000.0

NaN

the_peer_mode

the_peer_mode

Electron survey mode, controls angle and energy binning, and time resolution, values of 0 to 8

Data are produced from distributions that are reduced by averaging over angles. In slow survey mode a single angular bin is used. In fast survey six 90 degree by 90 degree bins are used.

PT3S

none

the_peer_epoch0

the_peer_epoch0

EPOCH of THEMIS time base

EPOCH of 01-Jan-1970 00:00:00

msec

1.0e-3>sec

ESA Burst Mode, Ion Density

the_peib_density

ESA Ion Density from burst angle distribution.

Burst distribution is used to generate these quantities. It is available at high temporal(3s/1spin) resolution and high angular resolution(88 angles), but it is only available very infrequently.

PT3S

cm^-3

1.0e6>m^-3

0.0

1.0E10

NaN

ESA Ion Average Temperature: Burst Distribution

the_peib_avgtemp

ESA Ion Average Temperature from burst angle distribution.

Burst distribution is used to generate these quantities. It is available at high temporal(3s/1spin) resolution and high angular resolution(88 angles), but it is only available very infrequently.

PT3S

eV

1.60217653e-19>J

0.0

1.0E10

NaN

ESA Ion Thermal Velocity: Burst Distribution

the_peib_vthermal

ESA Ion Thermal Velocity from burst angle distribution.

Burst distribution is used to generate these quantities. It is available at high temporal(3s/1spin) resolution and high angular resolution(88 angles), but it is only available very infrequently.

PT3S

km/s

1.0e3>m/s

0.0

1.0E10

NaN

SC Potential at burst distribution cadence

the_peib_sc_pot

The Spacecraft Potential that was used for calculating the moments that were generated from the burst angle distribution. This parameter was taken from the efi data and interpolated to the cadence of the esa burst distribution data.

This spacecraft potential parameter is the current best estimate of the spacecraft potential, estimates will improve as the mission continues. Burst distribution is used to generate these quantities. It is available at high temporal(3s/1spin) resolution and high angular resolution(88 angles), but it is only available very infrequently. EFI booms for THEMIS E(P4) were deployed on 2007-06-07/19:00:00 UT. Before this time this spacecraft potential was not calculated accurately and will not be available.

PT3S

V

0.0

1.0E10

NaN