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Data Access
FTPS from SPDF (not with most browsers)
HTTPS from SPDF
CDAWeb
WebService:
CDAWeb Programmatic Data Access
HAPI: CDAWeb HAPI Server
ACE Magnetic Field (MAG) Geocentric Solar Ecliptic, GSE, Coordinates, Preliminary Values, Key Parameter (K0), 5 min Data
var authors='Smith, C.W., and N.F. Ness';
document.write(authors);
(2022).
ACE Magnetic Field (MAG) Geocentric Solar Ecliptic, GSE, Coordinates, Preliminary Values, Key Parameter (K0), 5 min Data.
[Data set].
Space Physics Data Facility.
https://doi.org/10.48322/cs7n-7c62. Accessed on document.write(currentDateStr);.
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ResourceID
spase://NASA/NumericalData/ACE/MAG/KeyParameter/PT5M
Description
This Data Product contains Measurements from the ACE Magnetic Field Instrument (MAG). The Quality of ACE Level 2 Data is such that it is suitable for serious Scientific Study. However, to avoid Confusion and Misunderstanding, it is recommended that Users consult with the appropriate ACE Team Members before publishing Work derived from the Data. The ACE Team has worked hard to ensure that the Level 2 Data are free from Errors, but the Team cannot accept Responsibility for erroneous Data, or for Misunderstandings about how the Data may be used. This is especially true if the appropriate ACE Team Members are not consulted before Publication. At the very least, Preprints should be forwarded to the ACE Team before Publication. MAG References: http://www.srl.caltech.edu/ACE/. ACE Browse Data is designed for monitoring large-scale Particle and Field Behavior and for selecting interesting Time Periods. The Data are automatically generated from the Spacecraft Data Stream using simple Algorithms provided by the Instrument Teams. The Data are not routinely checked for Accuracy and is subject to Revision. Use this Data at your own Risk, and consult with the appropriate Instrument Teams about citing it. The Magnetometer Browse Data is not validated by the Experimenters and should not be used except for preliminary Examination prior to detailed Studies.
Metadata Rights
CC0-1.0:
Creative Commons Zero v1.0 Universal
Note
CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions. The actual data/software may be subject to a different license.
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Details
Version:2.7.1
NumericalData
ResourceID
spase://NASA/NumericalData/ACE/MAG/KeyParameter/PT5M
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
ACE Magnetic Field (MAG) Geocentric Solar Ecliptic, GSE, Coordinates, Preliminary Values, Key Parameter (K0), 5 min Data
DOI
https://doi.org/10.48322/cs7n-7c62
ReleaseDate
2025-12-04 13:28:24Z
RevisionHistory
RevisionEvent
ReleaseDate
2021-04-27 15:38:11
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2022-08-19 12:34:56.789
Note
Added DOI and PublicationInfo minted by JMW on 20220808, updated two InformationURL URLs, updated the RepositoryID, updated the SPDF MetadataContact Person to Robert M. Candey, metadata updated to SPASE 2.4.1, reviewed by LFB 20220819
RevisionEvent
ReleaseDate
2025-09-30 14:27:18Z
Note
Updated PublishedBy name to match ROR Registry. Added ResourceType and NamingAuthority. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. Matched version number in schemaLocation attribute to updated value in Version tag. ZCB
RevisionEvent
ReleaseDate
2025-12-04 13:28:24Z
Note
Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB
Description
This Data Product contains Measurements from the ACE Magnetic Field Instrument (MAG). The Quality of ACE Level 2 Data is such that it is suitable for serious Scientific Study. However, to avoid Confusion and Misunderstanding, it is recommended that Users consult with the appropriate ACE Team Members before publishing Work derived from the Data. The ACE Team has worked hard to ensure that the Level 2 Data are free from Errors, but the Team cannot accept Responsibility for erroneous Data, or for Misunderstandings about how the Data may be used. This is especially true if the appropriate ACE Team Members are not consulted before Publication. At the very least, Preprints should be forwarded to the ACE Team before Publication. MAG References: http://www.srl.caltech.edu/ACE/. ACE Browse Data is designed for monitoring large-scale Particle and Field Behavior and for selecting interesting Time Periods. The Data are automatically generated from the Spacecraft Data Stream using simple Algorithms provided by the Instrument Teams. The Data are not routinely checked for Accuracy and is subject to Revision. Use this Data at your own Risk, and consult with the appropriate Instrument Teams about citing it. The Magnetometer Browse Data is not validated by the Experimenters and should not be used except for preliminary Examination prior to detailed Studies.
Acknowledgement
N.F. Ness, Please acknowledge the Principal Investigator, N.F. Ness, Bartol Research Institute. See the Rules of Use available from the ACE Science Center at http://www.srl.caltech.edu/ace/asc/level2/policy_lvl2.html.
PublicationInfo
Authors
Smith, C.W., and N.F. Ness
PublicationDate
2022-01-01 00:00:00
PublishedBy
Space Physics Data Facility
Contacts
Role
Person
StartDate
StopDate
Note
1.
PrincipalInvestigator
spase://SMWG/Person/Norman.F.Ness
2.
MetadataContact
spase://SMWG/Person/Robert.M.Candey
3.
MetadataContact
spase://SMWG/Person/Lee.Frost.Bargatze
4.
MetadataContact
spase://SMWG/Person/James.M.Weygand
InformationURL
Name
ACE Science Center Home Page for Level 2 Data Release Notes
URL
https://izw1.caltech.edu/ACE/ASC/level2/index.html
Description
ACE Level 2 Data Release Notes Home Page
InformationURL
Name
ACE Science Center Home Page for Level 2 Rules of Use
URL
https://izw1.caltech.edu/ACE/ASC/level2/policy_lvl2.html
Description
ACE Level 2 Rules of Use Home Page
InformationURL
Name
ACE Magnetic Field (MAG) Instrument Home Page at the University of New Hampshire
URL
http://www-ssg.sr.unh.edu/mag/ACE.html
Description
ACE MAG Instrument Home Page at UNH
PriorIDs
spase://VSPO/NumericalData/ACE/MAG/PT300S
spase://VSPO/NumericalData/P_ACE_HDR_MAG_300S
spase://VSPO/NumericalData/ACE/MAG/KeyParameter/PT5M
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb
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
FTPS from SPDF (not with most browsers)
URL
ftps://spdf.gsfc.nasa.gov/pub/data/ace/mag/level_2_cdaweb/mfi_k0/
Description
Access to Data in CDF Format via ftp from SPDF
AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/ace/mag/level_2_cdaweb/mfi_k0/
Description
Access to Data in CDF Format via http from SPDF
AccessURL
Name
CDAWeb
URL
https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=AC_K0_MFI&index=sp_phys
ProductKey
AC_K0_MFI
Description
Access to ASCII, CDF, and Plots via NASA/GSFC CDAWeb
Format
CDF
Encoding
None
AccessDirectoryTemplate
https://cdaweb.gsfc.nasa.gov/pub/data/ace/mag/level_2_cdaweb/mfi_k0/$Y
AccessFilenameTemplate
ac_k0_mfi_$Y$m$d_$v.cdf
Acknowledgement
N.F. Ness, Please acknowledge the Principal Investigator, N.F. Ness, Bartol Research Institute. See the Rules of Use available from the ACE Science Center at http://www.srl.caltech.edu/ace/asc/level2/policy_lvl2.html. Please acknowledge the Data Providers and CDAWeb when using these Data.
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb Programmatic Data Access
URL
https://cdaweb.gsfc.nasa.gov/WS/cdasr/1/dataviews/sp_phys/datasets/AC_K0_MFI/clientLibraryExample/
Style
WebService
ProductKey
AC_K0_MFI
Description
Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS.
Format
Binary
Acknowledgement
N.F. Ness, Please acknowledge the Principal Investigator, N.F. Ness, Bartol Research Institute. See the Rules of Use available from the ACE Science Center at http://www.srl.caltech.edu/ace/asc/level2/policy_lvl2.html. Please acknowledge the Data Providers and CDAWeb when using these Data.
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb
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
CDAWeb HAPI Server
URL
https://cdaweb.gsfc.nasa.gov/hapi
Style
HAPI
ProductKey
AC_K0_MFI
Description
Web Service to this product using the HAPI interface.
Format
CSV
Acknowledgement
N.F. Ness, Please acknowledge the Principal Investigator, N.F. Ness, Bartol Research Institute. See the Rules of Use available from the ACE Science Center at http://www.srl.caltech.edu/ace/asc/level2/policy_lvl2.html. Please acknowledge the Data Providers and CDAWeb when using these Data.
ProviderProcessingLevel
Calibrated
InstrumentIDs
spase://SMWG/Instrument/ACE/MAG
MeasurementType
MagneticField
TemporalDescription
TimeSpan
StartDate
2017-01-01 00:00:00.000
RelativeStopDate
-P7D
Note
The Data become available about one Week after Observation
Cadence
PT5M
ObservedRegion
Heliosphere
ObservedRegion
Heliosphere.Inner
ObservedRegion
Heliosphere.NearEarth
Parameter #1
Name
Epoch Time
ParameterKey
Epoch
Description
Epoch Time
Caveats
This Parameter exhibits an increasing Monotonic Progression.
Cadence
PT5M
Units
ms
UnitsConversion
1.0e-3>s
RenderingHints
AxisLabel
Epoch
ValueFormat
E14.8
ScaleMin
6.2987652219904e+13
ScaleMax
6.3745034619904e+13
ScaleType
LinearScale
ValidMin
01-Jan-1996 00:00:00.000
ValidMax
01-Jan-2020 00:00:00.000
FillValue
-1.0e+31
Support
SupportQuantity
Temporal
Parameter #2
Name
Time PB5
Set
Time Series defined by using: EPOCH
ParameterKey
Time_PB5
Description
Time PB5, Time of Observation, Year, Day, and Milliseconds of Day
Caveats
This Parameter exhibits an increasing Monotonic Progression.
Cadence
PT5M
RenderingHints
ScaleType
LinearScale
Structure
Size
3
Element
Name
Year
Index
1
Units
a
ValidMin
1997
ValidMax
2020
RenderingHints
AxisLabel
year
ScaleMin
1997
ScaleMax
2020
Element
Name
Day of Year (Jan 1 = Day 1)
Index
2
Units
d
ValidMin
1
ValidMax
366
RenderingHints
AxisLabel
day
ScaleMin
1
ScaleMax
366
Element
Name
Elapsed milliseconds of day
Index
3
Units
ms
ValidMin
0
ValidMax
86400
RenderingHints
AxisLabel
msec
ScaleMin
0
ScaleMax
86400
FillValue
-2147483648
Support
SupportQuantity
Temporal
Parameter #3
Name
Weight, Number of Measurements in Average
Set
Time Series defined by using: EPOCH
ParameterKey
Weight
Description
Weight, Number of Measurements in Average for 5 min Data
Cadence
PT5M
RenderingHints
AxisLabel
Weight
ValueFormat
I4
ScaleMin
0
ScaleMax
1824
ScaleType
LinearScale
ValidMin
0
ValidMax
1824
FillValue
-2147483648
Support
SupportQuantity
Other
Parameter #4
Name
Magnetic Field Magnitude
Set
Time Series defined by using: EPOCH
ParameterKey
Magnitude
Description
Magnetic Field Magnitude
Caveats
The Magnetic Field Browse Data are not validated by the Experimenters and should not be used except for preliminary Examination prior to detailed Studies
Cadence
PT5M
Units
nT
UnitsConversion
1.0e-9>T
RenderingHints
DisplayType
TimeSeries
AxisLabel
< B
ValueFormat
F8.3
ScaleMin
0.0
ScaleMax
5.0
ValidMin
0.0
ValidMax
100.0
FillValue
-1.0e+31
Field
Qualifier
Magnitude
FieldQuantity
Magnetic
Parameter #5
Name
Magnetic Field Vector, GSE, Cartesian Coordinates
Set
Time Series defined by using: EPOCH
ParameterKey
BGSEc
Description
Magnetic Field Vector, Geocentric Solar Ecliptic, GSE, Cartesian Coordinates
Caveats
The Magnetic Field Browse Data are not validated by the Experimenters and should not be used except for preliminary Examination prior to detailed Studies
Cadence
PT5M
Units
nT
UnitsConversion
1.0e-9>T
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
RenderingHints
DisplayType
TimeSeries
ValueFormat
F9.3
ScaleMin
-5.0
ScaleMax
5.0
Structure
Size
3
Element
Name
Bx GSE
Index
1
RenderingHints
AxisLabel
x
Element
Name
By GSE
Index
2
RenderingHints
AxisLabel
y
Element
Name
Bz GSE
Index
3
RenderingHints
AxisLabel
z
ValidMin
-100.0
ValidMax
100.0
FillValue
-1.0e+31
Field
Qualifier
Vector
FieldQuantity
Magnetic