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Data Access

THEMIS-B: Fluxgate Magnetometer Measurements 1/128s

ResourceID
spase://DLR/NumericalData/THEMIS/B/FGM/PT0.0078125S

Description

Spacecraft-collected fluxgate magnetometer measurements: Decimated TeleMetry High, DSL, GSE and GSM coordinates, cadence 3s-1/128s. The high-resolution data is available only for time intervals when the instrument was switched into a high-resolution mode. Sensor and electronics design provided by TUBS (Glassmeier, Auster) and IWF (Baumjohann, Magnes)

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Details

Version:2.7.2

NumericalData

ResourceID
spase://DLR/NumericalData/THEMIS/B/FGM/PT0.0078125S
NamingAuthority
DLR
ResourceType
NumericalData
ResourceHeader
ResourceName
THEMIS-B: Fluxgate Magnetometer Measurements 1/128s
ReleaseDate
2026-11-04 16:34:31Z
RevisionHistory
RevisionEvent
ReleaseDate
2021-04-27 17:51:13Z
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2026-11-04 16:34:31Z
Note
Added HelioCloud S3 AccessURL. Added ResourceType and NamingAuthority. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. Updated to 2.7.2. ZCB
Description

Spacecraft-collected fluxgate magnetometer measurements: Decimated TeleMetry High, DSL, GSE and GSM coordinates, cadence 3s-1/128s. The high-resolution data is available only for time intervals when the instrument was switched into a high-resolution mode. Sensor and electronics design provided by TUBS (Glassmeier, Auster) and IWF (Baumjohann, Magnes)

Acknowledgement
NASA contract NAS5-02099 and V. Angelopoulos for use of data from the THEMIS Mission, K. H. Glassmeier, U. Auster and W. Baumjohann for the use of FGM data provided under the lead of the Technical University of Braunschweig and with financial support through the German Ministry for Economy and Technology and the German Center for Aviation and Space (DLR) under contract 50 OC 0302
Contacts
RolePersonStartDateStopDateNote
1.CoInvestigatorspase://SMWG/Person/Rumi.Nakamura
2.CoInvestigatorspase://SMWG/Person/Wolfgang.Baumjohann
3.CoInvestigatorspase://SMWG/Person/Karl-Heinz.Glassmeier
4.PrincipalInvestigatorspase://SMWG/Person/Vassilis.Angelopoulos
InformationURL
Name
THEMIS website
URL
http://themis.ssl.berkeley.edu
PriorIDs
spase://VMO/NumericalData/THEMIS-B/FGM/PT0.0078125S
spase://VMO/NumericalData/THEMIS/B/FGM/PT0.0078125S
spase://VSPO/NumericalData/THEMIS/B/FGM/PT0.0078125S
spase://NASA/NumericalData/THEMIS/B/FGM/PT0.0078125S
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb
Availability
Online
AccessRights
Open
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
ftps://spdf.gsfc.nasa.gov/pub/data/themis/thb/l2/fgm/
Description

NASA/GSFC CDAWeb ftp access to the data.

AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/themis/thb/l2/fgm/
Description

In CDF via HTTP from SPDF

AccessURL
Name
CDAWeb
URL
https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=THB_L2_FGM&index=sp_phys
ProductKey
THB_L2_FGM
Description

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

Format
CDF
Encoding
None
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb HAPI Server
URL
https://cdaweb.gsfc.nasa.gov/hapi
Style
HAPI
ProductKey
THB_L2_FGM@0
ProductKey
THB_L2_FGM@1
ProductKey
THB_L2_FGM@2
ProductKey
THB_L2_FGM@3
Description

Web Service to this product using the HAPI interface.

Format
CSV
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF
Availability
Online
AccessRights
Open
RightsList
Rights
SchemeURI
https://spdx.org/licenses/
RightsIdentifierScheme
SPDX
RightsIdentifier
CC0-1.0
RightsURI
https://spdx.org/licenses/CC0-1.0.html
RightsName
Creative Commons Zero v1.0 Universal
Note
CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products
AccessURL
Name
HelioCloud Catalog Endpoint
URL
https://api.heliocloud.org/cloudcatalog?id=THB_L2_FGM
Style
Overview
ProductKey
THB_L2_FGM
Description

Endpoint to access the data from HelioCloud. Data is split into one CSV file per year.

Format
CSV
Encoding
S3_BUCKET
ProcessingLevel
Calibrated
ProviderProcessingLevel
Level 2
InstrumentIDs
spase://SMWG/Instrument/THEMIS/B/FGM
MeasurementType
MagneticField
TemporalDescription
TimeSpan
StartDate
2007-02-16 00:00:00Z
RelativeStopDate
-P07D
ObservedRegion
Heliosphere.NearEarth
ObservedRegion
Earth.Magnetosphere.Magnetotail
ObservedRegion
Earth.Magnetosphere.Main
ObservedRegion
Earth.Magnetosheath
Caveats
The THEMIS mission uses the coordinate name " DSL" for the coordinate system that is called "SR2" is the SPASE data model. See THEMIS website for caveats.
Parameter #1
Name
B FGE SSL
ParameterKey
thb_fge_ssl
Description

FGE (engineering) magnetic field B in XYZ Spinning Spacecraft Coordinates (SSL)

Cadence
PT0.125S
Units
nT
UnitsConversion
1e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SR
Structure
Size
3
Element
Name
Bx FGE
Qualifier
Component.I
Index
1
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
By FGE
Qualifier
Component.J
Index
2
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Bz FGE
Qualifier
Component.K
Index
3
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #2
Name
B FGE DSL
ParameterKey
thb_fge_dsl
Description

FGE (engineering) magnetic field B in XYZ Despun Spacecraft Coordinates (DSL/SR2)

Cadence
PT0.125S
Units
nT
UnitsConversion
1e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SR2
Structure
Size
3
Element
Name
Bx FGE
Qualifier
Component.I
Index
1
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
By FGE
Qualifier
Component.J
Index
2
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Bz FGE
Qualifier
Component.K
Index
3
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #3
Name
B FGE GSE
ParameterKey
thb_fge_gse
Description

FGE (engineering) magnetic field B in XYZ GSE Coordinates

Cadence
PT0.125S
Units
nT
UnitsConversion
1e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
Structure
Size
3
Element
Name
Bx FGE
Qualifier
Component.I
Index
1
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
By FGE
Qualifier
Component.J
Index
2
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Bz FGE
Qualifier
Component.K
Index
3
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #4
Name
B FGE GSM
ParameterKey
thb_fge_gsm
Description

FGE (engineering) magnetic field B in XYZ GSM Coordinates

Cadence
PT0.125S
Units
nT
UnitsConversion
1e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSM
Structure
Size
3
Element
Name
Bx FGE
Qualifier
Component.I
Index
1
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
By FGE
Qualifier
Component.J
Index
2
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Bz FGE
Qualifier
Component.K
Index
3
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #5
Name
FGE Time
ParameterKey
thb_fge_time
Description

FGE time, UTC, in seconds since 01-Jan-1970 00:00:00

Caveats
Unleaped seconds
Cadence
PT0.125S
Units
s
ValidMin
0.0
ValidMax
5.0E9
FillValue
NaN
Support
SupportQuantity
Temporal
Parameter #6
Name
B FGL SSL
ParameterKey
thb_fgl_ssl
Description

FGL (low-resolution) magnetic field B in XYZ Spinning Spacecraft Coordinates (SSL)

Cadence
PT0.25S
Units
nT
UnitsConversion
1e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SR
Structure
Size
3
Element
Name
Bx FGL
Qualifier
Component.I
Index
1
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
By FGL
Qualifier
Component.J
Index
2
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Bz FGL
Qualifier
Component.K
Index
3
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #7
Name
B FGL DSL
ParameterKey
thb_fgl_dsl
Description

FGL (low-resolution) magnetic field B in XYZ Despun Spacecraft Coordinates (DSL/SR2)

Cadence
PT0.25S
Units
nT
UnitsConversion
1e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SR2
Structure
Size
3
Element
Name
Bx FGL
Qualifier
Component.I
Index
1
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
By FGL
Qualifier
Component.J
Index
2
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Bz FGL
Qualifier
Component.K
Index
3
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #8
Name
B FGL GSE
ParameterKey
thb_fgl_gse
Description

FGL (low-resolution) magnetic field B in XYZ GSE Coordinates

Cadence
PT0.25S
Units
nT
UnitsConversion
1e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
Structure
Size
3
Element
Name
Bx FGL
Qualifier
Component.I
Index
1
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
By FGL
Qualifier
Component.J
Index
2
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Bz FGL
Qualifier
Component.K
Index
3
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #9
Name
B FGL GSM
ParameterKey
thb_fgl_gsm
Description

FGL (low-resolution) magnetic field B in XYZ GSM Coordinates

Cadence
PT0.25S
Units
nT
UnitsConversion
1e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSM
Structure
Size
3
Element
Name
Bx FGL
Qualifier
Component.I
Index
1
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
By FGL
Qualifier
Component.J
Index
2
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Bz FGL
Qualifier
Component.K
Index
3
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #10
Name
FGL Time
ParameterKey
thb_fgl_time
Description

FGL time, UTC, in seconds since 01-Jan-1970 00:00:00

Cadence
PT0.25S
Units
s
ValidMin
0.0
ValidMax
5.0E9
FillValue
NaN
Support
SupportQuantity
Temporal
Parameter #11
Name
B FGH SSL
ParameterKey
thb_fgh_ssl
Description

FGH (high-resolution) magnetic field B in XYZ Spinning Spacecraft Coordinates (SSL)

Cadence
PT0.0078125S
Units
nT
UnitsConversion
1e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SR
Structure
Size
3
Element
Name
Bx FGH
Qualifier
Component.I
Index
1
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
By FGH
Qualifier
Component.J
Index
2
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Bz FGH
Qualifier
Component.K
Index
3
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #12
Name
B FGH DSL
ParameterKey
thb_fgh_dsl
Description

FGH (high-resolution) magnetic field B in XYZ Despun Spacecraft Coordinates (DSL/SR2)

Cadence
PT0.0078125S
Units
nT
UnitsConversion
1e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SR2
Structure
Size
3
Element
Name
Bx FGH
Qualifier
Component.I
Index
1
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
By FGH
Qualifier
Component.J
Index
2
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Bz FGH
Qualifier
Component.K
Index
3
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #13
Name
B FGH GSE
ParameterKey
thb_fgh_gse
Description

FGH (high-resolution) magnetic field B in XYZ GSE Coordinates

Cadence
PT0.0078125S
Units
nT
UnitsConversion
1e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
Structure
Size
3
Element
Name
Bx FGH
Qualifier
Component.I
Index
1
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
By FGH
Qualifier
Component.J
Index
2
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Bz FGH
Qualifier
Component.K
Index
3
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #14
Name
B FGH GSM
ParameterKey
thb_fgh_gsm
Description

FGH (high-resolution) magnetic field B in XYZ GSM Coordinates

Cadence
PT0.0078125S
Units
nT
UnitsConversion
1e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSM
Structure
Size
3
Element
Name
Bx FGH
Qualifier
Component.I
Index
1
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
By FGH
Qualifier
Component.J
Index
2
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Bz FGH
Qualifier
Component.K
Index
3
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #15
Name
FGH Time
ParameterKey
thb_fgh_time
Description

FGH time, UTC, in seconds since 01-Jan-1970 00:00:00

Cadence
PT0.0078125S
Units
s
ValidMin
0.0
ValidMax
5.0E9
FillValue
NaN
Support
SupportQuantity
Temporal
Parameter #16
Name
B FGS DSL
ParameterKey
thb_fgs_dsl
Description

FGS (spin-resolution/3s) magnetic field B in XYZ Despun Spacecraft Coordinates (DSL/SR2)

Cadence
PT3S
Units
nT
UnitsConversion
1e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
SR2
Structure
Size
3
Element
Name
Bx FGS
Qualifier
Component.I
Index
1
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
By FGS
Qualifier
Component.J
Index
2
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Bz FGS
Qualifier
Component.K
Index
3
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #17
Name
B FGS GSE
ParameterKey
thb_fgs_gse
Description

FGS (spin-resolution/3s) magnetic field B in XYZ GSE Coordinates

Cadence
PT3S
Units
nT
UnitsConversion
1e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
Structure
Size
3
Element
Name
Bx FGS
Qualifier
Component.I
Index
1
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
By FGS
Qualifier
Component.J
Index
2
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Bz FGS
Qualifier
Component.K
Index
3
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #18
Name
B FGS GSM
ParameterKey
thb_fgs_gsm
Description

FGS (spin-resolution/3s) magnetic field B in XYZ GSM Coordinates

Cadence
PT3S
Units
nT
UnitsConversion
1e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSM
Structure
Size
3
Element
Name
Bx FGS
Qualifier
Component.I
Index
1
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
By FGS
Qualifier
Component.J
Index
2
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Element
Name
Bz FGS
Qualifier
Component.K
Index
3
ValidMin
-25000.0
ValidMax
25000.0
FillValue
NaN
Field
Qualifier
Vector
FieldQuantity
Magnetic
Parameter #19
Name
FGS Time
ParameterKey
thb_fgs_time
Description

FGS time, UTC, in seconds since 01-Jan-1970 00:00:00

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