ResourceID

spase://NASA/NumericalData/THEMIS/B/Fits/PT3S

Description

THEMIS-B: 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.

Version:2.2.9

ResourceID

spase://NASA/NumericalData/THEMIS/B/Fits/PT3S

ResourceHeader

ResourceName

THEMIS-B: 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 21:15:25Z

Description

THEMIS-B: 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

Role | Person | |
---|---|---|

1. | PrincipalInvestigator | spase://SMWG/Person/Vassilis.Angelopoulos |

2. | CoInvestigator | spase://SMWG/Person/John.W.Bonnell |

3. | CoInvestigator | spase://SMWG/Person/Forrest.S.Mozer |

InformationURL

PriorIDs

spase://VMO/NumericalData/THEMIS-B/Fits/PT3S

spase://VMO/NumericalData/THEMIS/B/Fits/PT3S

spase://VSPO/NumericalData/THEMIS/B/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

THB_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 B were not deployed until November 17, 2007 at 0600 UT, any EFI measurements before this date should not be used.

Parameter #1

Name

THEMIS B Fluxgate Magnetometer Spin Fit Deviation

ParameterKey

thb_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 B Fluxgate Magnetometer Spin Fit Data DSL

ParameterKey

thb_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-B

Qualifier

Component.I

Index

1

ValidMin

-25000.0

ValidMax

25000.0

FillValue

NaN

Element

Name

By DSL FGS-B

Qualifier

Component.J

Index

2

ValidMin

-25000.0

ValidMax

25000.0

FillValue

NaN

Element

Name

Bz DSL FGS-B

Qualifier

Component.K

Index

3

ValidMin

-25000.0

ValidMax

25000.0

FillValue

NaN

Field

Qualifier

Vector

FieldQuantity

Magnetic

Parameter #3

Name

THEMIS B Fluxgate Magnetometer Spin Fit Data GSE

ParameterKey

thb_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-B

Qualifier

Component.I

Index

1

ValidMin

-25000.0

ValidMax

25000.0

FillValue

NaN

Element

Name

By GSE FGS-B

Qualifier

Component.J

Index

2

ValidMin

-25000.0

ValidMax

25000.0

FillValue

NaN

Element

Name

Bz GSE FGS-B

Qualifier

Component.K

Index

3

ValidMin

-25000.0

ValidMax

25000.0

FillValue

NaN

Field

Qualifier

Vector

FieldQuantity

Magnetic

Parameter #4

Name

THEMIS B Fluxgate Magnetometer Spin Fit Data GSM

ParameterKey

thb_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-B

Qualifier

Component.I

Index

1

ValidMin

-25000.0

ValidMax

25000.0

FillValue

NaN

Element

Name

By GSM FGS-B

Qualifier

Component.J

Index

2

ValidMin

-25000.0

ValidMax

25000.0

FillValue

NaN

Element

Name

Bz GSM FGS-B

Qualifier

Component.K

Index

3

ValidMin

-25000.0

ValidMax

25000.0

FillValue

NaN

Field

Qualifier

Vector

FieldQuantity

Magnetic

Parameter #5

Name

THEMIS B Fluxgate Magnetometer Spin-Fit Data Times

ParameterKey

thb_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 B Electric Field Instrument Spin Fit Deviation

ParameterKey

thb_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 B were deployed on November 17, 2007 at 0600 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 B Electric Field Instrument Spin Fit Data DSL

ParameterKey

thb_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 B were deployed on November 17, 2007 at 0600 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-B

Qualifier

Component.I

Index

1

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Element

Name

Ey DSL EFS-B

Qualifier

Component.J

Index

2

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Element

Name

Ez DSL EFS-B

Qualifier

Component.K

Index

3

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Field

Qualifier

Vector

FieldQuantity

Electric

Parameter #8

Name

THEMIS B Electric Field Instrument Z=0 Spin-Fit Data DSL

ParameterKey

thb_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 B were deployed on November 17, 2007 at 0600 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-B

Qualifier

Component.I

Index

1

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Element

Name

Ey DSL EFS_0-B

Qualifier

Component.J

Index

2

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Element

Name

Ez DSL EFS_0-B

Qualifier

Component.K

Index

3

ValidMin

-0.0

ValidMax

0.0

FillValue

NaN

Field

Qualifier

Vector

FieldQuantity

Electric

Parameter #9

Name

THEMIS B Electric Field Instrument E dot B = 0 Spin-Fit Data DSL

ParameterKey

thb_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 B were deployed on November 17, 2007 at 0600 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-B

Qualifier

Component.I

Index

1

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Element

Name

Ey DSL EFS_dot0-B

Qualifier

Component.J

Index

2

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Element

Name

Ez DSL EFS_dot0-B

Qualifier

Component.K

Index

3

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Field

Qualifier

Vector

FieldQuantity

Electric

Parameter #10

Name

THEMIS B Electric Field Instrument Spin Fit Data GSE

ParameterKey

thb_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 B were deployed on November 17, 2007 at 0600 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-B

Qualifier

Component.I

Index

1

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Element

Name

Ey GSE EFS-B

Qualifier

Component.J

Index

2

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Element

Name

Ez GSE EFS-B

Qualifier

Component.K

Index

3

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Field

Qualifier

Vector

FieldQuantity

Electric

Parameter #11

Name

THEMIS B Electric Field Instrument Z=0 Spin-Fit Data GSE

ParameterKey

thb_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 B were deployed on November 17, 2007 at 0600 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-B

Qualifier

Component.I

Index

1

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Element

Name

Ey GSE EFS_0-B

Qualifier

Component.J

Index

2

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Element

Name

Ez GSE EFS_0-B

Qualifier

Component.I

Index

3

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Field

Qualifier

Vector

FieldQuantity

Electric

Parameter #12

Name

THEMIS B Electric Field Instrument E dot B = 0 Spin-Fit Data GSE

ParameterKey

thb_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 B were deployed on November 17, 2007 at 0600 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-B

Qualifier

Component.I

Index

1

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Element

Name

Ey GSE EFS_dot0-B

Qualifier

Component.J

Index

2

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Element

Name

Ez GSE EFS_dot0-B

Qualifier

Component.K

Index

3

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Field

Qualifier

Vector

FieldQuantity

Electric

Parameter #13

Name

THEMIS B Electric Field Instrument Spin Fit Data GSM

ParameterKey

thb_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 B were deployed on November 17, 2007 at 0600 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-B

Qualifier

Component.I

Index

1

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Element

Name

Ey GSM EFS-B

Qualifier

Component.J

Index

2

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Element

Name

Ez GSM EFS-B

Qualifier

Component.K

Index

3

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Field

Qualifier

Vector

FieldQuantity

Electric

Parameter #14

Name

THEMIS B Electric Field Instrument Z=0 Spin-Fit Data GSM

ParameterKey

thb_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 B were deployed on November 17, 2007 at 0600 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-B

Qualifier

Component.I

Index

1

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Element

Name

Ey GSM EFS_0-B

Qualifier

Component.J

Index

2

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Element

Name

Ez GSM EFS_0-B

Qualifier

Component.I

Index

3

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Field

Qualifier

Vector

FieldQuantity

Electric

Parameter #15

Name

THEMIS B Electric Field Instrument E dot B = 0 Spin-Fit Data GSM

ParameterKey

thb_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 B were deployed on November 17, 2007 at 0600 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-B

Qualifier

Component.I

Index

1

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Element

Name

Ey GSM EFS_dot0-B

Qualifier

Component.J

Index

2

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Element

Name

Ez GSM EFS_dot0-B

Qualifier

Component.K

Index

3

ValidMin

-1000.0

ValidMax

1000.0

FillValue

NaN

Field

Qualifier

Vector

FieldQuantity

Electric

Parameter #16

Name

THEMIS B Electric Field Instrument Spin-Fit Data Times

ParameterKey

thb_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 B Fluxgate Magnetometer Spin Fit Model DSL

ParameterKey

thb_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-B

Index

1

ValidMin

-25000.0

ValidMax

25000.0

FillValue

NaN

Element

Name

B FIT_BFIT FGM-B

Index

2

ValidMin

-25000.0

ValidMax

25000.0

FillValue

NaN

Element

Name

C FIT_BFIT FGM-B

Index

3

ValidMin

-25000.0

ValidMax

25000.0

FillValue

NaN

Element

Name

Sigma FIT_BFIT FGM-B

Index

4

ValidMin

-25000.0

ValidMax

25000.0

FillValue

NaN

Element

Name

Avg. FIT_BFIT FGM-B

Index

5

ValidMin

-25000.0

ValidMax

25000.0

FillValue

NaN

Field

FieldQuantity

Magnetic

Parameter #18

Name

THEMIS B Fluxgate Magnetometer Spin-Fit Model Times

ParameterKey

thb_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 B Electric Field Instrument Spin Fit Model DSL

ParameterKey

thb_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-B

Index

1

ValidMin

-25000.0

ValidMax

25000.0

FillValue

NaN

Element

Name

B FIT_EFIT EFI-B

Index

2

ValidMin

-25000.0

ValidMax

25000.0

FillValue

NaN

Element

Name

C FIT_EFIT EFI-B

Index

3

ValidMin

-25000.0

ValidMax

25000.0

FillValue

NaN

Element

Name

Sigma FIT_EFIT EFI-B

Index

4

ValidMin

-25000.0

ValidMax

25000.0

FillValue

NaN

Element

Name

Avg. FIT_EFIT EFI-B

Index

5

ValidMin

-25000.0

ValidMax

25000.0

FillValue

NaN

Field

FieldQuantity

Electric

Parameter #20

Name

THEMIS B Electric Field Instrument Spin-Fit Model Times

ParameterKey

thb_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