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THEMIS-E: On Board spin fits (FIT) of Electric (EFI) and Magnetic (FGM) field. On-Board Spin-fit electric and magnetic field data

ResourceID
spase://NASA/NumericalData/THEMIS/E/Fits/PT3S

Description

THEMIS-E: On Board spin fits of Electric (EFI) and Magnetic (FGM) fields. This file contains data EFI and FGM that has been despun on-board to 3 second resolution. It stores meta information like the number of points that contributed to each spin and the standard deviation of those points. For the EFI data it also stores variables with the Z component of the EFI data zeroed and the Z component of the EFI estimated using the E.B=0 equality. The need to use an estimated Z axis for the EFI is due to error in measurements from the EFI axial booms. These data are provided in DSL (despun spacecraft L-Z vector), GSM, and GSE coordinates.

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Details

Version:2.2.9

NumericalData

ResourceID
spase://NASA/NumericalData/THEMIS/E/Fits/PT3S
ResourceHeader
ResourceName
THEMIS-E: On Board spin fits (FIT) of Electric (EFI) and Magnetic (FGM) field. On-Board Spin-fit electric and magnetic field data
ReleaseDate
2020-07-07 21:15:28Z
Description

THEMIS-E: On Board spin fits of Electric (EFI) and Magnetic (FGM) fields. This file contains data EFI and FGM that has been despun on-board to 3 second resolution. It stores meta information like the number of points that contributed to each spin and the standard deviation of those points. For the EFI data it also stores variables with the Z component of the EFI data zeroed and the Z component of the EFI estimated using the E.B=0 equality. The need to use an estimated Z axis for the EFI is due to error in measurements from the EFI axial booms. These data are provided in DSL (despun spacecraft L-Z vector), GSM, and GSE coordinates.

Acknowledgement
NASA contract NAS5-02099 and V. Angelopoulos for use of data from the THEMIS Mission. Specifically: J. W. Bonnell and F. S. Mozer for use of EFI data.
Contacts
RolePerson
1.PrincipalInvestigatorspase://SMWG/Person/Vassilis.Angelopoulos
2.CoInvestigatorspase://SMWG/Person/John.W.Bonnell
3.CoInvestigatorspase://SMWG/Person/Forrest.S.Mozer
InformationURL
Name
THEMIS website
URL
PriorIDs
spase://VMO/NumericalData/THEMIS-E/Fits/PT3S
spase://VMO/NumericalData/THEMIS/E/Fits/PT3S
spase://VSPO/NumericalData/THEMIS/E/Fits/PT3S
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
Description

NASA/GSFC CDAWeb ftp access to the data.

AccessURL
Name
HTTPS from SPDF
URL
Description

In CDF via HTTP from SPDF

AccessURL
Name
CDAWeb
URL
ProductKey
THE_L2_FIT
Description

Access to ASCII, CDF, and plots via NASA/GSFC CDAWeb.

Format
CDF
Encoding
None
ProcessingLevel
Calibrated
ProviderProcessingLevel
Level 2
ProviderVersion
Version 01
InstrumentIDs
MeasurementType
ElectricField
MeasurementType
MagneticField
TemporalDescription
TimeSpan
StartDate
2008-01-14 17:00:00
RelativeStopDate
-P7D
Cadence
PT3S
ObservedRegion
Heliosphere.NearEarth
ObservedRegion
Earth.Magnetosphere.Magnetotail
ObservedRegion
Earth.Magnetosphere.Main
ObservedRegion
Earth.Magnetosheath
Caveats
The electric field spin plane booms for THEMIS E were not deployed until June 07, 2007 at 1900 UT, any EFI measurements before this date should not be used.
Parameter #1
Name
THEMIS E Fluxgate Magnetometer Spin Fit Deviation
ParameterKey
the_fgs_sigma
Description

Fluxgate magnetometer on-board instrument measurements are at higher resolution. This parameter stores the standard deviation of the fluxgate magentometer spin fit for each spin resolution element of this data quantity in nT.

Caveats
Calculations of spin-fit for these data are performed on-board.
Cadence
PT3S
Units
nT
UnitsConversion
10e-9>T
ValidMin
0.0
ValidMax
25000.0
FillValue
NaN
Field
Qualifier
StandardDeviation
FieldQuantity
Magnetic
Parameter #2
Name
THEMIS E Fluxgate Magnetometer Spin Fit Data DSL
ParameterKey
the_fgs_dsl
Description

FGS (spin-fit) magnetic field vector in despun spacecraft coordinates (DSL). To despin, these data are direction corrected using the spin-model and binned down from the cadence of the instrument to the cadence of each spin (3-sec). These coordinates (DSL) use the Z axis of the spin plane (L Vector), not the probe geometric Z axis.

Caveats
Calculations of spin-fit for these data are performed on-board.
Cadence
PT3S
Units
nT
UnitsConversion
10e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SR2
Structure
Size
3
Description

This structure represents the Magnetic Field Vector B in DSL

Element
Name
Bx DSL FGS-E
Qualifier
Component.I
Index
1
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
By DSL FGS-E
Qualifier
Component.J
Index
2
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Bz DSL FGS-E
Qualifier
Component.K
Index
3
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #3
Name
THEMIS E Fluxgate Magnetometer Spin Fit Data GSE
ParameterKey
the_fgs_gse
Description

FGS (spin-fit) magnetic field vector in GSE coordinates. These data are despun. To despin, these data are direction corrected using the spin-model and binned down from the cadence of the instrument to the cadence of each spin (3-sec). Then they are converted to GSE on the ground.

Caveats
Calculations of spin-fit for these data are performed on-board.
Cadence
PT3S
Units
nT
UnitsConversion
10e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
Structure
Size
3
Description

This structure represents the Magnetic Field Vector B in GSE

Element
Name
Bx GSE FGS-E
Qualifier
Component.I
Index
1
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
By GSE FGS-E
Qualifier
Component.J
Index
2
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Bz GSE FGS-E
Qualifier
Component.K
Index
3
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #4
Name
THEMIS E Fluxgate Magnetometer Spin Fit Data GSM
ParameterKey
the_fgs_gsm
Description

FGS (spin-fit) magnetic field vector in GSM coordinates. These data are despun. To despin, these data are direction corrected using the spin-model and binned down from the cadence of the instrument to the cadence of each spin (3-sec). Then they are converted to GSM coordinates on the ground.

Caveats
Calculations of spin-fit for these data are performed on-board.
Cadence
PT3S
Units
nT
UnitsConversion
10e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSM
Structure
Size
3
Description

This structure represents the Magnetic Field Vector B in GSM

Element
Name
Bx GSM FGS-E
Qualifier
Component.I
Index
1
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
By GSM FGS-E
Qualifier
Component.J
Index
2
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Bz GSM FGS-E
Qualifier
Component.K
Index
3
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #5
Name
THEMIS E Fluxgate Magnetometer Spin-Fit Data Times
ParameterKey
the_fgs_time
Description

Dates/Times for each measurement in seconds since 01-Jan-1970 00:00:00 UTC

Caveats
Unleaped seconds
Cadence
PT3S
Units
s
ValidMin
0.0
ValidMax
5.0E9
FillValue
NaN
Support
SupportQuantity
Temporal
Parameter #6
Name
THEMIS E Electric Field Instrument Spin Fit Deviation
ParameterKey
the_efs_sigma
Description

Electric Field Instrument on-board measurements are at higher resolution. This parameter stores the standard deviation of the electric field instrument spin fit for each spin resolution element of this data quantity in mV/m.

Caveats
Calculations of spin-fit for these data are performed on-board. Electric Field Booms for THEMIS E were deployed on June 7,2007 at 1900 UT. Measurements should not be considered valid before the deploy date. Z-axis measurements should be treated very carefully. Because the Z-axis booms are much shorter than the spin plane booms, the measurements in the Z-axis are much more inaccurate.
Cadence
PT3S
Units
mV/m
UnitsConversion
10e-3>V/m
ValidMin
0.0
ValidMax
1000.0
FillValue
NaN
Field
Qualifier
StandardDeviation
FieldQuantity
Electric
Parameter #7
Name
THEMIS E Electric Field Instrument Spin Fit Data DSL
ParameterKey
the_efs_dsl
Description

EFS (spin-fit) electric field vector in despun spacecraft coordinates (DSL) To despin, these data are direction corrected using the spin-model and binned down from the cadence of the instrument to the cadence of each spin (3-sec). These coordinates use the Z axis of the spin plane(L Vector), not the probe geometric Z axis.

Caveats
Calculations of spin-fit for these data are performed on-board. Electric Field Booms for THEMIS E were deployed on June 7,2007 at 1900 UT. Measurments should not be considered valid before the deploy date. Z-axis measurements should be treated very carefully. Because the Z-axis booms are much shorter than the spin plane booms, the measurements in the Z-axis are much more inaccurate.
Cadence
PT3S
Units
mV/m
UnitsConversion
10e-3>V/m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SR2
Structure
Size
3
Description

This structure represents the Electric Field Vector E in DSL

Element
Name
Ex DSL EFS-E
Qualifier
Component.I
Index
1
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Element
Name
Ey DSL EFS-E
Qualifier
Component.J
Index
2
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Element
Name
Ez DSL EFS-E
Qualifier
Component.K
Index
3
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Electric
Parameter #8
Name
THEMIS E Electric Field Instrument Z=0 Spin-Fit Data DSL
ParameterKey
the_efs_0_dsl
Description

EFS (spin-fit) electric field vector with Z=0 in despun spacecraft coordinates. (DSL) To despin, these data are direction corrected using the spin-model and binned down from the cadence of the instrument to the cadence of each spin (3-sec). Since the Z component of the electric field has large error, it has been set to zero in this data quantity. These coordinates use the Z axis of the spin plane(L Vector), not the probe geometric Z axis.

Caveats
Calculations of spin-fit for these data are performed on-board. Electric Field Booms for THEMIS E were deployed on June 7,2007 at 1900 UT. Measurments should not be considered valid before the deploy date. The Z axis is zeroed for this quantity because the Z-axis booms are much shorter than the spin plane booms and thus the measurements in the Z axis are much more inaccurate.
Cadence
PT3S
Units
mV/m
UnitsConversion
10e-3>V/m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SR2
Structure
Size
3
Description

This structure represents the Electric Field Vector E in DSL with Z=0

Element
Name
Ex DSL EFS_0-E
Qualifier
Component.I
Index
1
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Element
Name
Ey DSL EFS_0-E
Qualifier
Component.J
Index
2
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Element
Name
Ez DSL EFS_0-E
Qualifier
Component.K
Index
3
ValidMin
-0.0
ValidMax
0.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Electric
Parameter #9
Name
THEMIS E Electric Field Instrument E dot B = 0 Spin-Fit Data DSL
ParameterKey
the_efs_dot0_dsl
Description

EFS (spin-fit) electric field vector with E dot B = 0 in despun spacecraft coordinates. (DSL) To despin, these data are direction corrected using the spin-model and binned down from the cadence of the instrument to the cadence of each spin (3-sec). Since the Z component of the electric field has large error, the value of Ez that makes the dot product of E and B closest to zero is used in this data product, rather than the measured Z value. These coordinates use the Z axis of the spin plane (L Vector), not the probe geometric Z axis.

Caveats
Calculations of spin-fit for these data are performed on-board. Electric Field Booms for THEMIS E were deployed on June 7,2007 at 1900 UT. Measurments should not be considered valid before the deploy date. The Z axis is estimated for this quantity because the Z-axis booms are much shorter than the spin plane booms and thus the measurements in the Z axis are much more inaccurate.
Cadence
PT3S
Units
mV/m
UnitsConversion
10e-3>V/m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SR2
Structure
Size
3
Description

This structure represents the Electric Field Vector E in DSL with E dot B = 0

Element
Name
Ex DSL EFS_dot0-E
Qualifier
Component.I
Index
1
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Element
Name
Ey DSL EFS_dot0-E
Qualifier
Component.J
Index
2
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Element
Name
Ez DSL EFS_dot0-E
Qualifier
Component.K
Index
3
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Electric
Parameter #10
Name
THEMIS E Electric Field Instrument Spin Fit Data GSE
ParameterKey
the_efs_gse
Description

EFS (spin-fit) electric field vector in GSE coordinates. Data are first despun on-board, then converted to GSE coordinates on the ground. To despin, these data are direction corrected using the spin-model and binned down from the cadence of the instrument to the cadence of each spin (3-sec).

Caveats
Calculations of spin-fit for these data are performed on-board. Electric Field Booms for THEMIS E were deployed on June 7,2007 at 1900 UT. Measurments should not be considered valid before the deploy date. Z-axis measurements should be treated very carefully. Because the Z-axis booms are much shorter than the spin plane booms, the measurements in the Z-axis are much more inaccurate.
Cadence
PT3S
Units
mV/m
UnitsConversion
10e-3>V/m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
Structure
Size
3
Description

This structure represents the Electric Field Vector E in GSE

Element
Name
Ex GSE EFS-E
Qualifier
Component.I
Index
1
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Element
Name
Ey GSE EFS-E
Qualifier
Component.J
Index
2
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Element
Name
Ez GSE EFS-E
Qualifier
Component.K
Index
3
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Electric
Parameter #11
Name
THEMIS E Electric Field Instrument Z=0 Spin-Fit Data GSE
ParameterKey
the_efs_0_gse
Description

EFS (spin-fit) electric field vector with Z=0 in GSE coordinates. Data are first despun on-board, then converted to GSE coordinates on the ground. To despin, these data are direction corrected using the spin-model and binned down from the cadence of the instrument to the cadence of each spin (3-sec). Since the Z component of the electric field has large error, it has been set to zero in this data quantity.

Caveats
Calculations of spin-fit for these data are performed on-board. Electric Field Booms for THEMIS E were deployed on June 7,2007 at 1900 UT. Measurments should not be considered valid before the deploy date. The Z axis is zeroed for this quantity because the Z-axis booms are much shorter than the spin plane booms and thus the measurements in the Z axis are much more inaccurate. The Z-axis is zeroed prior to conversion to GSE coordinates, so the zeroed axis will probably not be colinear with the Z axis of the GSE coordinate system.
Cadence
PT3S
Units
mV/m
UnitsConversion
10e-3>V/m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
Structure
Size
3
Description

This structure represents the Electric Field Vector E in GSE with Z(dsl)=0

Element
Name
Ex GSE EFS_0-E
Qualifier
Component.I
Index
1
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Element
Name
Ey GSE EFS_0-E
Qualifier
Component.J
Index
2
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Element
Name
Ez GSE EFS_0-E
Qualifier
Component.I
Index
3
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Electric
Parameter #12
Name
THEMIS E Electric Field Instrument E dot B = 0 Spin-Fit Data GSE
ParameterKey
the_efs_dot0_gse
Description

EFS (spin-fit) electric field vector with E dot B = 0 in GSE coordinates. Data are first despun on-board, then converted to GSE coordinates on the ground. To despin, these data are direction corrected using the spin-model and binned down from the cadence of the instrument to the cadence of each spin (3-sec). Since the Z component of the electric field has large error, the value of Ez that makes the dot product of E and B closest to zero is used in this data product, rather than the measured Z value.

Caveats
Calculations of spin-fit for these data are performed on-board. Electric Field Booms for THEMIS E were deployed on June 7,2007 at 1900 UT. Measurments should not be considered valid before the deploy date. The Z axis is estimated for this quantity because the Z-axis booms are much shorter than the spin plane booms and thus the measurements in the Z axis are much more inaccurate. The Z-axis is estimated prior to conversion to GSE coordinates, so the estimated axis will probably not be colinear with the Z axis of the GSE coordinate system.
Cadence
PT3S
Units
mV/m
UnitsConversion
10e-3>V/m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
Structure
Size
3
Description

This structure represents the Electric Field Vector E in GSE with E dot B = 0

Element
Name
Ex GSE EFS_dot0-E
Qualifier
Component.I
Index
1
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Element
Name
Ey GSE EFS_dot0-E
Qualifier
Component.J
Index
2
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Element
Name
Ez GSE EFS_dot0-E
Qualifier
Component.K
Index
3
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Electric
Parameter #13
Name
THEMIS E Electric Field Instrument Spin Fit Data GSM
ParameterKey
the_efs_gsm
Description

EFS (spin-fit) electric field vector in GSM coordinates. Data are first despun on-board, then converted to GSM coordinates on the ground. To despin, these data are direction corrected using the spin-model and binned down from the cadence of the instrument to the cadence of each spin (3-sec).

Caveats
Calculations of spin-fit for these data are performed on-board. Electric Field Booms for THEMIS E were deployed on June 7,2007 at 1900 UT. Measurments should not be considered valid before the deploy date. Z-axis measurements should be treated very carefully. Because the Z-axis booms are much shorter than the spin plane booms, the measurements in the Z-axis are much more inaccurate.
Cadence
PT3S
Units
mV/m
UnitsConversion
10e-3>V/m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSM
Structure
Size
3
Description

This structure represents the Electric Field Vector E in GSM

Element
Name
Ex GSM EFS-E
Qualifier
Component.I
Index
1
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Element
Name
Ey GSM EFS-E
Qualifier
Component.J
Index
2
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Element
Name
Ez GSM EFS-E
Qualifier
Component.K
Index
3
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Electric
Parameter #14
Name
THEMIS E Electric Field Instrument Z=0 Spin-Fit Data GSM
ParameterKey
the_efs_0_gsm
Description

EFS (spin-fit) electric field vector with Z=0 in GSM coordinates. Data are first despun on-board, then converted to GSM coordinates on the ground. To despin, these data are direction corrected using the spin-model and binned down from the cadence of the instrument to the cadence of each spin (3-sec). Since the Z component of the electric field has large error, it has been set to zero in this data quantity.

Caveats
Calculations of spin-fit for these data are performed on-board. Electric Field Booms for THEMIS E were deployed on June 7,2007 at 1900 UT. Measurments should not be considered valid before the deploy date. The Z axis is zeroed for this quantity because the Z-axis booms are much shorter than the spin plane booms and thus the measurements in the Z axis are much more inaccurate. The Z-axis is zeroed prior to conversion to GSM coordinates, so the zeroed axis will probably not be colinear with the Z axis of the GSM coordinate system.
Cadence
PT3S
Units
mV/m
UnitsConversion
10e-3>V/m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSM
Structure
Size
3
Description

This structure represents the Electric Field Vector E in GSM with Z(dsl)=0

Element
Name
Ex GSM EFS_0-E
Qualifier
Component.I
Index
1
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Element
Name
Ey GSM EFS_0-E
Qualifier
Component.J
Index
2
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Element
Name
Ez GSM EFS_0-E
Qualifier
Component.I
Index
3
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Electric
Parameter #15
Name
THEMIS E Electric Field Instrument E dot B = 0 Spin-Fit Data GSM
ParameterKey
the_efs_dot0_gsm
Description

EFS (spin-fit) electric field vector with E dot B = 0 in GSM coordinates. Data are first despun on-board, then converted to GSM coordinates on the ground. To despin, these data are direction corrected using the spin-model and binned down from the cadence of the instrument to the cadence of each spin (3-sec). Since the Z component of the electric field has large error, the value of Ez that makes the dot product of E and B closest to zero is used in this data product, rather than the measured Z value.

Caveats
Calculations of spin-fit for these data are performed on-board. Electric Field Booms for THEMIS E were deployed on June 7,2007 at 1900 UT. Measurments should not be considered valid before the deploy date. The Z axis is estimated for this quantity because the Z-axis booms are much shorter than the spin plane booms and thus the measurements in the Z axis are much more inaccurate. The Z-axis is estimated prior to conversion to GSM coordinates, so the estimated axis will probably not be colinear with the Z axis of the GSM coordinate system.
Cadence
PT3S
Units
mV/m
UnitsConversion
10e-3>V/m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSM
Structure
Size
3
Description

This structure represents the Electric Field Vector E in GSM with E dot B = 0

Element
Name
Ex GSM EFS_dot0-E
Qualifier
Component.I
Index
1
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Element
Name
Ey GSM EFS_dot0-E
Qualifier
Component.J
Index
2
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Element
Name
Ez GSM EFS_dot0-E
Qualifier
Component.K
Index
3
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Electric
Parameter #16
Name
THEMIS E Electric Field Instrument Spin-Fit Data Times
ParameterKey
the_efs_time
Description

Dates/Times for each measurement in seconds since 01-Jan-1970 00:00:00 UTC

Caveats
Unleaped seconds
Cadence
PT3S
Units
s
ValidMin
0.0
ValidMax
5.0E9
FillValue
NaN
Support
SupportQuantity
Temporal
Parameter #17
Name
THEMIS E Fluxgate Magnetometer Spin Fit Model DSL
ParameterKey
the_fit_bfit
Description

This parameter contains the calibrated fluxgate magnetometer spin model data in despun spacecraft coordinates (DSL). The spin model uses a sine-wave spin model to calculate the spin and despin. These coefficients(A,B,C), the standard deviation(Sigma), and the average value(Avg.) are provided. The equations used for the model are

  F = Sum(i=1 to N)[E(t_i) - (A + B*sin(omega*t_i)+C*cos(omega*t_i))]^2  , 
  delta F/delta A = Sum(i=1 to N)-2*[E(t_i) - (A + B*sin(omega*t_i) + C*cos(omega*t_i))]  ,
  delta F/delta B = Sum(i=1 to N)-2*[E(t_i) - (A + B*sin(omega*t_i) + C*cos(omega*t_i))]-sin(omega*t_i)  ,
  delta F/delta C =  Sum(i=1 to N)-2*[E(t_i) - (A + B*sin(omega*t_i) + C*cos(omega*t_i))]*cos(omega*t_i)  , 
  Gamma = sqrt(F/(N-1))
  
  The system of equations is solved and outliers are removed until no more outliers can be removed.
Caveats
Calculations of spin-fit is performed on-board. The B,C, & Average components of this parameter are very close to the X,Y and Z components(respectively) of the fgs quantity. In this parameter scaling factors are applied, but the data do not have finer calibrations applied. These data are also in despun sensor coordinates, rather than despun spacecraft coordinates. Practically, this means the Z axis is the opposite of the normal DSL coordinate system.
Cadence
PT3S
Units
nT
UnitsConversion
10e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SC
Structure
Size
5
Description

This structure stores the parameters of the FGM spin fit(A,B,C), the standard deviation of the spin fit(Sigma), and the mean of the spin fit(Avg.) as Time by 5 array

Element
Name
A FIT_BFIT FGM-E
Index
1
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
B FIT_BFIT FGM-E
Index
2
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
C FIT_BFIT FGM-E
Index
3
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Sigma FIT_BFIT FGM-E
Index
4
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Avg. FIT_BFIT FGM-E
Index
5
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Field
FieldQuantity
Magnetic
Parameter #18
Name
THEMIS E Fluxgate Magnetometer Spin-Fit Model Times
ParameterKey
the_fit_bfit_time
Description

Dates/Times for each measurement in seconds since 01-Jan-1970 00:00:00 UTC

Caveats
Unleaped seconds
Cadence
PT3S
Units
s
ValidMin
0.0
ValidMax
5.0E9
FillValue
NaN
Support
SupportQuantity
Temporal
Parameter #19
Name
THEMIS E Electric Field Instrument Spin Fit Model DSL
ParameterKey
the_fit_efit
Description

This parameter contains the calibrated electric field instrument spin model data in despun spacecraft coordinates (DSL). The spin model uses a sine-wave spin model to calculate the spin and despin. These coefficients(A,B,C), the standard deviation(Sigma), and the average value(Avg.) are provided. The equations used for the model are

  F = Sum(i=1 to N)[E(t_i) - (A + B*sin(omega*t_i)+C*cos(omega*t_i))]^2  ,
  delta F/delta A = Sum(i=1 to N)-2*[E(t_i) - (A + B*sin(omega*t_i) + C*cos(omega*t_i))]  ,
  delta F/delta B = Sum(i=1 to N)-2*[E(t_i) - (A + B*sin(omega*t_i) + C*cos(omega*t_i))]-sin(omega*t_i)  ,
  delta F/delta C =  Sum(i=1 to N)-2*[E(t_i) - (A + B*sin(omega*t_i) + C*cos(omega*t_i))]*cos(omega*t_i)  ,
  Gamma = sqrt(F/(N-1))  
  
  The system of equations is solved and outliers are removed until no more outliers can be removed.
Caveats
Calculations of spin-fit is performed on-board. The B,C, & Average components of this parameter are very close to the X,Y and Z components(respectively) of the efs quantity. In this parameter scaling factors are applied, but the data do not have finer calibrations applied.
Cadence
PT3S
Units
mV/m
UnitsConversion
10e-3>V/m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SC
Structure
Size
5
Description

This structure stores the parameters of the EFI spin fit(A,B,C), the standard deviation of the spin fit(Sigma), and the mean of the spin fit(Avg.) as Time by 5 array

Element
Name
A FIT_EFIT EFI-E
Index
1
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
B FIT_EFIT EFI-E
Index
2
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
C FIT_EFIT EFI-E
Index
3
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Sigma FIT_EFIT EFI-E
Index
4
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Avg. FIT_EFIT EFI-E
Index
5
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Field
FieldQuantity
Electric
Parameter #20
Name
THEMIS E Electric Field Instrument Spin-Fit Model Times
ParameterKey
the_fit_bfit_time
Description

Dates/Times for each measurement in seconds since 01-Jan-1970 00:00:00 UTC

Caveats
Unleaped seconds
Cadence
PT3S
Units
s
ValidMin
0.0
ValidMax
5.0E9
FillValue
NaN
Support
SupportQuantity
Temporal