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MMS 2 Flux Gate Magnetometer (FGM) DC Magnetic Field, Level 2, Burst Survey

ResourceID
spase://NASA/NumericalData/MMS/2/FIELDS/FGM/Burst/Level2/PT0.0078125S

Description

The Fluxgate Magnetometers (FGM) on Magnetospheric Multiscale consist of a traditional Analog Fluxgate Magnetometer (AFG) and a Digital Fluxgate magnetometer (DFG). The dual magnetometers are operated as a single instrument providing a single intercalibrated data product. Range changes occur at different times on the two instruments so the gains checked each periapsis can be carried out unambiguously to apoapsis. Cross correlation of calibration parameters can separate causes of the any apparent calibration changes. Use of Electron Drift Instrument (EDI) to determine the field along the rotation axis allows accurate monitoring of the zero levels along the rotation axis. Prior to launch the magnetometers were calibrated at the Technical University, Braunschweig, except for the AFG magnetometers on MMS3 and MMS4, which were calibrated at UCLA. Both sets of sensors are operated for the entire MMS orbit, with slow survey (8 samples per second) outside of the Region of Interest (ROI), and fast survey (16 samples per second) inside the ROI. Within the ROI, burst mode data (128 samples per second) are also acquired. A detailed description of the MMS fluxgate magnetometers, including science objectives, instrument description, calibration, magnetic cleanliness program, and data flow can be found at http://link.springer.com/article/10.1007%2Fs11214-014-0057-3 (DOI 10.1007/s11214-014-0057-3). Additional information can also be found at http://www-spc.igpp.ucla.edu/ssc/mms (UCLA), and http://www.iwf.oeaw.ac.at/de/forschung/erdnaher-weltraum/mms/dfg (IWF, Graz). For the purpose of creating a unified FGM Level 2 data product, burst mode data is taken from DFG and survey mode data is taken from AFG. Because AFG and DFG are cross-calibrated on an orbit-averaged basis, small differences in offset may be observed between Level 2 burst and survey mode data. Consequently, any differences are within the error of the measurement. Based on preliminary analysis of the data, the absolute error within the Region of Interest (ROI) is estimated to be no more than 0.1 nT in the spin-plane, 0.15 nT along the spin-axis and 0.2 nT in total magnitude.

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Details

Version:2.3.2

NumericalData

ResourceID
spase://NASA/NumericalData/MMS/2/FIELDS/FGM/Burst/Level2/PT0.0078125S
ResourceHeader
ResourceName
MMS 2 Flux Gate Magnetometer (FGM) DC Magnetic Field, Level 2, Burst Survey
ReleaseDate
2021-04-27 15:38:11Z
Description

The Fluxgate Magnetometers (FGM) on Magnetospheric Multiscale consist of a traditional Analog Fluxgate Magnetometer (AFG) and a Digital Fluxgate magnetometer (DFG). The dual magnetometers are operated as a single instrument providing a single intercalibrated data product. Range changes occur at different times on the two instruments so the gains checked each periapsis can be carried out unambiguously to apoapsis. Cross correlation of calibration parameters can separate causes of the any apparent calibration changes. Use of Electron Drift Instrument (EDI) to determine the field along the rotation axis allows accurate monitoring of the zero levels along the rotation axis. Prior to launch the magnetometers were calibrated at the Technical University, Braunschweig, except for the AFG magnetometers on MMS3 and MMS4, which were calibrated at UCLA. Both sets of sensors are operated for the entire MMS orbit, with slow survey (8 samples per second) outside of the Region of Interest (ROI), and fast survey (16 samples per second) inside the ROI. Within the ROI, burst mode data (128 samples per second) are also acquired. A detailed description of the MMS fluxgate magnetometers, including science objectives, instrument description, calibration, magnetic cleanliness program, and data flow can be found at http://link.springer.com/article/10.1007%2Fs11214-014-0057-3 (DOI 10.1007/s11214-014-0057-3). Additional information can also be found at http://www-spc.igpp.ucla.edu/ssc/mms (UCLA), and http://www.iwf.oeaw.ac.at/de/forschung/erdnaher-weltraum/mms/dfg (IWF, Graz). For the purpose of creating a unified FGM Level 2 data product, burst mode data is taken from DFG and survey mode data is taken from AFG. Because AFG and DFG are cross-calibrated on an orbit-averaged basis, small differences in offset may be observed between Level 2 burst and survey mode data. Consequently, any differences are within the error of the measurement. Based on preliminary analysis of the data, the absolute error within the Region of Interest (ROI) is estimated to be no more than 0.1 nT in the spin-plane, 0.15 nT along the spin-axis and 0.2 nT in total magnitude.

Acknowledgement
J. L. Burch, C. T. Russell, W. Magnus
Contacts
RolePerson
1.PrincipalInvestigatorspase://SMWG/Person/James.L.Burch
2.PrincipalInvestigatorspase://SMWG/Person/Christopher.T.Russell
3.PrincipalInvestigatorspase://SMWG/Person/Werner.Magnes
4.MetadataContactspase://SMWG/Person/Robert.E.McGuire
5.MetadataContactspase://SMWG/Person/Lee.Frost.Bargatze
InformationURL
Name
The Magnetospheric Multiscale (MMS) Mission home page at Goddard Space Flight Center (GSFC)
URL
Description

The Magnetospheric Multiscale (MMS) Mission Home Page hosted by the Goddard Space Flight Center (GSFC).

InformationURL
Name
Data Caveats and Current Release Notes at LASP MMS SDC
URL
Description

The Magnetospheric Multiscale (MMS) Mission home page hosted by the Laboratory of Atmospheric and Space Physics, Science Data Center (LASP, SDC) at the University of Colorado, Boulder.

InformationURL
Name
The MMS Graz FGM Team home page at IWF, OAW
URL
Description

The Magnetospheric Multiscale (MMS) Flux Gate Magnetometer (FGM) home page hosted by the Institut fur Weltraumforschung (IWF), Osterreichische Akademie der Wissenschaften (OAW).

PriorIDs
spase://VSPO/NumericalData/MMS/2/FIELDS/FGM/Burst/Level2/PT0.0078125S
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
Description

In CDF via ftp from SPDF.

AccessURL
Name
HTTPS from SPDF
URL
Description

In CDF via http from SPDF.

AccessURL
Name
CDAWeb
URL
ProductKey
MMS2_FGM_BRST_L2
Description

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

Format
CDF
Encoding
None
Acknowledgement
J. L. Burch, C. T. Russell, W. Magnus. Please acknowledge the data providers and CDAWeb when using these data.
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb HAPI Server
URL
Style
HAPI
ProductKey
MMS2_FGM_BRST_L2@0
ProductKey
MMS2_FGM_BRST_L2@1
Description

Web Service to this product using the HAPI interface.

Format
CSV
Acknowledgement
J. L. Burch, C. T. Russell, W. Magnus. Please acknowledge the data providers and CDAWeb when using these data.
ProcessingLevel
Calibrated
InstrumentIDs
MeasurementType
MagneticField
TemporalDescription
TimeSpan
StartDate
2015-09-01 12:11:14
RelativeStopDate
-P2M
Cadence
PT0.0078125S
ObservedRegion
Earth.Magnetosheath
ObservedRegion
Earth.Magnetosphere
ObservedRegion
Earth.Magnetosphere.Magnetotail
ObservedRegion
Earth.Magnetosphere.Main
ObservedRegion
Earth.Magnetosphere.RadiationBelt
ObservedRegion
Earth.NearSurface.EquatorialRegion
ObservedRegion
Earth.NearSurface.Plasmasphere
ObservedRegion
Heliosphere.NearEarth
Parameter #1
Name
Epoch
ParameterKey
Epoch
Description

Interval centered time tag (TBC)

Caveats
This parameter exhibits an increasing monotonic progression.
Cadence
PT0.0078125S
Units
ns
UnitsConversion
1.0e-9>s
RenderingHints
AxisLabel
mms2_fgm_brst_Epoch
ScaleType
LinearScale
ValidMin
2010-01-01T00:00:00.000000000
ValidMax
2030-01-01T00:00:00.999000000
FillValue
9999-12-31T23:59:59.999999999
Support
SupportQuantity
Temporal
Parameter #2
Name
mms2_fgm_b_gse_brst_l2
Set
Time series defined by using: EPOCH
ParameterKey
mms2_fgm_b_gse_brst_l2
Description

Magnetic field vector in Geocentric Solar Ecliptic (GSE) cartesian coordinates plus Btotal (128 samples/s)

Cadence
PT0.0078125S
Units
nT
UnitsConversion
1.0e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
RenderingHints
DisplayType
TimeSeries
ValueFormat
e13.5
ScaleType
LinearScale
Structure
Size
4
Element
Name
Bx GSE
Index
1
ValidMin
-20000.0
Element
Name
By GSE
Index
2
ValidMin
-20000.0
Element
Name
Bz GSE
Index
3
ValidMin
-20000.0
Element
Name
Bt
Index
4
ValidMin
0.0
ValidMax
20000.0
FillValue
-1.0e+31
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #3
Name
mms2_fgm_b_gsm_brst_l2
Set
Time series defined by using: EPOCH
ParameterKey
mms2_fgm_b_gsm_brst_l2
Description

Magnetic field vector in Geocentric Solar Magnetospheric (GSM) cartesian coordinates plus Btotal (128 samples/s)

Cadence
PT0.0078125S
Units
nT
UnitsConversion
1.0e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSM
RenderingHints
DisplayType
TimeSeries
ValueFormat
e13.5
ScaleType
LinearScale
Structure
Size
4
Element
Name
Bx GSM
Index
1
ValidMin
-20000.0
Element
Name
By GSM
Index
2
ValidMin
-20000.0
Element
Name
Bz GSM
Index
3
ValidMin
-20000.0
Element
Name
Bt
Index
4
ValidMin
0.0
ValidMax
20000.0
FillValue
-1.0e+31
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #4
Name
mms2_fgm_b_dmpa_brst_l2
Set
Time series defined by using: EPOCH
ParameterKey
mms2_fgm_b_dmpa_brst_l2
Description

Magnetic field vector in Despun MPA-aligned cartesian coordinates plus Btotal (128 samples/s)

Caveats
During nominal operations in the region of interest, DMPA is within 3 degrees of GSE.
Cadence
PT0.0078125S
Units
nT
UnitsConversion
1.0e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
RenderingHints
DisplayType
TimeSeries
ValueFormat
e13.5
ScaleType
LinearScale
Structure
Size
4
Element
Name
Bx DMPA
Index
1
ValidMin
-20000.0
Element
Name
By DMPA
Index
2
ValidMin
-20000.0
Element
Name
Bz DMPA
Index
3
ValidMin
-20000.0
Element
Name
Bt
Index
4
ValidMin
0.0
ValidMax
20000.0
FillValue
-1.0e+31
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #5
Name
mms2_fgm_b_bcs_brst_l2
Set
Time series defined by using: EPOCH
ParameterKey
mms2_fgm_b_bcs_brst_l2
Description

Magnetic field vector in Body Coordinate System cartesian coordinates plus Btotal (128 samples/s)

Cadence
PT0.0078125S
Units
nT
UnitsConversion
1.0e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SC
RenderingHints
DisplayType
TimeSeries
ValueFormat
e13.5
ScaleType
LinearScale
Structure
Size
4
Element
Name
Bx BCS
Index
1
ValidMin
-20000.0
Element
Name
By BCS
Index
2
ValidMin
-20000.0
Element
Name
Bz BCS
Index
3
ValidMin
-20000.0
Element
Name
Bt
Index
4
ValidMin
0.0
ValidMax
20000.0
FillValue
-1.0e+31
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #6
Name
mms2_fgm_flag_brst_l2
Set
Time series defined by using: EPOCH
ParameterKey
mms2_fgm_flag_brst_l2
Description

Data quality flag: 0=No identified problems, non-zero=blank out the data

Caveats
bit definitions: 0: TBD, 1: TBD, 2: user flagged, 3: TBD, 4: B1 saturated, 5: B2 saturated, 6: B3 saturated, 7: range-change glitch, 8-31: TBD
Cadence
PT0.0078125S
RenderingHints
AxisLabel
mms2_fgm_flag_brst_l2
ValueFormat
z10.8
ScaleType
LinearScale
ValidMin
0
ValidMax
4294967281
FillValue
4294967295
Support
SupportQuantity
InstrumentMode
Parameter #7
Name
Epoch_state
ParameterKey
Epoch_state
Description

Default time

Caveats
This parameter exhibits an increasing monotonic progression.
Cadence
PT0.0078125S
Units
ns
UnitsConversion
1.0e-9>s
RenderingHints
AxisLabel
Epoch_state
ScaleType
LinearScale
ValidMin
1990-01-01T00:00:00.000000000
ValidMax
2030-01-01T00:00:00.999000000
FillValue
9999-12-31T23:59:59.999999999
Support
SupportQuantity
Temporal
Parameter #8
Name
mms2_fgm_r_gse_brst_l2
Set
Time series defined by using: EPOCH_STATE
ParameterKey
mms2_fgm_r_gse_brst_l2
Description

Definitive position in GSE coordinates, 30-s time resolution

Cadence
PT0.0078125S
Units
km
UnitsConversion
1.0e3>m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
RenderingHints
DisplayType
TimeSeries
ValueFormat
e12.2
ScaleType
LinearScale
Structure
Size
4
Element
Name
X GSE
Index
1
Element
Name
Y GSE
Index
2
Element
Name
Z GSE
Index
3
Element
Name
R
Index
4
ValidMin
-1.0e+06
ValidMax
1.0e+06
FillValue
-1.0e+31
Support
Qualifier
Vector
SupportQuantity
Positional
Parameter #9
Name
mms2_fgm_r_gsm_brst_l2
Set
Time series defined by using: EPOCH_STATE
ParameterKey
mms2_fgm_r_gsm_brst_l2
Description

Definitive position in GSM coordinates, 30-s time resolution

Cadence
PT0.0078125S
Units
km
UnitsConversion
1.0e3>m
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSM
RenderingHints
DisplayType
TimeSeries
ValueFormat
e12.2
ScaleType
LinearScale
Structure
Size
4
Element
Name
X GSM
Index
1
Element
Name
Y GSM
Index
2
Element
Name
Z GSM
Index
3
Element
Name
R
Index
4
ValidMin
-1.0e+06
ValidMax
1.0e+06
FillValue
-1.0e+31
Support
Qualifier
Vector
SupportQuantity
Positional
Parameter #10
Name
mms2_fgm_hirange_brst_l2
Set
Time series defined by using: EPOCH
ParameterKey
mms2_fgm_hirange_brst_l2
Description

Magnetic field range setting: 1=High Range, 0=Low Range

Cadence
PT0.0078125S
RenderingHints
AxisLabel
mms2_fgm_hirange_brst_l2
ValueFormat
i5
ScaleType
LinearScale
ValidMin
0
ValidMax
2
FillValue
255
Support
Qualifier
Median
SupportQuantity
Other
Parameter #11
Name
mms2_fgm_bdeltahalf_brst_l2
Set
Time series defined by using: EPOCH
ParameterKey
mms2_fgm_bdeltahalf_brst_l2
Description

Delta from center time to sample start/finish

Cadence
PT0.0078125S
Units
s
UnitsConversion
1>s
RenderingHints
AxisLabel
mms2_fgm_bdeltahalf_brst_l2
ValueFormat
e13.5
ValidMin
0.001
ValidMax
1.0
FillValue
-1.0e+31
Support
Qualifier
Median
SupportQuantity
Temporal
Parameter #12
Name
mms2_fgm_stemp_brst_l2
Set
Time series defined by using: EPOCH
ParameterKey
mms2_fgm_stemp_brst_l2
Description

Sensor temperature smoothed four times with 6-pt boxcar filter (/edge_truncate), linear interpolated to mag times, then smoothed with a 1279-pt boxcar

Caveats
Sensor Temperature smoothed four times with 6-pt boxcar filter (/edge_truncate), linear interpolated to mag times, then smoothed with 1279-pt boxcar, t_maxgap=240, t_bmaxgap=240.
Cadence
PT0.0078125S
Units
°C
UnitsConversion
1>s^-1
RenderingHints
AxisLabel
mms2_fgm_stemp_brst_l2
ValueFormat
e13.5
ScaleType
LinearScale
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #13
Name
mms2_fgm_etemp_brst_l2
Set
Time series defined by using: EPOCH
ParameterKey
mms2_fgm_etemp_brst_l2
Description

Electronics temperature smoothed four times with 6-pt boxcar filter (/edge_truncate), linear interpolated to mag times, then smoothed with a 1279-pt boxcar

Caveats
Electronics Temperature smoothed four times with 6-pt boxcar filter (/edge_truncate), linear interpolated to mag times, then smoothed with 1279-pt boxcar, t_maxgap=240, t_bmaxgap=240.
Cadence
PT0.0078125S
Units
°C
RenderingHints
AxisLabel
mms2_fgm_etemp_brst_l2
ValueFormat
e13.5
ScaleType
LinearScale
ValidMin
-1000.0
ValidMax
1000.0
FillValue
NaN
Support
Qualifier
Scalar
SupportQuantity
Other
Parameter #14
Name
mms2_fgm_mode_brst_l2
Set
Time series defined by using: EPOCH
ParameterKey
mms2_fgm_mode_brst_l2
Description

Median rate (samples/s) of the current instrument mode. This rate is not necessarily equal to the rate of the L2 data, which may have been downsampled.

Caveats
8=slow, 16=fast, 128=f128. Note that 128 samples/s L1A data is decimated to 16 samples/s in srvy L1B
Cadence
PT0.0078125S
Units
s^-1
RenderingHints
AxisLabel
mms2_fgm_mode_brst_l2
ValueFormat
e13.5
ValidMin
2.0
ValidMax
200.0
FillValue
-1.0e+31
Support
SupportQuantity
InstrumentMode
Parameter #15
Name
mms2_fgm_rdeltahalf_brst_l2
Set
Time series defined by using: EPOCH_STATE
ParameterKey
mms2_fgm_rdeltahalf_brst_l2
Description

One half of the median delta between ephemeris samples

Cadence
PT0.0078125S
Units
s
UnitsConversion
1>s
RenderingHints
AxisLabel
mms2_fgm_rdeltahalf_brst_l2
ValueFormat
e13.5
ValidMin
1.0
ValidMax
100.0
FillValue
-1.0e+31
Support
Qualifier
Median
SupportQuantity
Temporal