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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 Solar Wind Electron, Proton, and Alpha Monitor (SWEPAM) Plasma Moments, Preliminary Values, Key Parameter (K0), 5 min Data
var authors='McComas, D., Skoug, R., Delapp, D., Elliott, H., and Davis, A.';
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(2022).
ACE Solar Wind Electron, Proton, and Alpha Monitor (SWEPAM) Plasma Moments, Preliminary Values, Key Parameter (K0), 5 min Data.
[Data set].
Space Physics Data Facility.
https://doi.org/10.48322/pfr6-fg57. Accessed on document.write(currentDateStr);.
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or other formats, should include the "Accessed on date" to identify the version of the resource being cited in a given publication.
ResourceID
spase://NASA/NumericalData/ACE/SWEPAM/KeyParameter/PT5M
Description
The ACE Browse Data are 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. It is 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. These are SWEPAM Browse Data. These Data have not validated by the Experimenters and should not be used except for preliminary Examination prior to detailed Studies. SWEPAM - Solar Wind Electron Proton Alpha Monitor References: https://izw1.caltech.edu/ACE/.
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/SWEPAM/KeyParameter/PT5M
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
ACE Solar Wind Electron, Proton, and Alpha Monitor (SWEPAM) Plasma Moments, Preliminary Values, Key Parameter (K0), 5 min Data
DOI
https://doi.org/10.48322/pfr6-fg57
ReleaseDate
2025-12-04 13:28:25Z
RevisionHistory
RevisionEvent
ReleaseDate
2021-04-27 15:38:11
Note
Last known prior metadata Release Date
RevisionEvent
ReleaseDate
2022-04-20 12:34:56.789
Note
ACE: DOI and PublicationInfo added, metadata revised by J.M. Weygand on 2022-04-08, reviewed by LFB
RevisionEvent
ReleaseDate
2022-05-17 12:34:56.789
Note
ACE: Updated to SPASE Version 2.4.0, three InformationURL URLs updated, revised by LFB on 2022-05-17
RevisionEvent
ReleaseDate
2025-09-30 14:27:19Z
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 13:28:25Z
Note
Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB
Description
The ACE Browse Data are 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. It is 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. These are SWEPAM Browse Data. These Data have not validated by the Experimenters and should not be used except for preliminary Examination prior to detailed Studies. SWEPAM - Solar Wind Electron Proton Alpha Monitor References: https://izw1.caltech.edu/ACE/.
Acknowledgement
D.J. McComas, Please acknowledge the Principal Investigator, D.J. McComas, Southwest Research Institute.
PublicationInfo
Authors
McComas, D., Skoug, R., Delapp, D., Elliott, H., and Davis, A.
PublicationDate
2022-04-27 00:00:00
PublishedBy
Space Physics Data Facility
Contacts
Role
Person
StartDate
StopDate
Note
1.
PrincipalInvestigator
spase://SMWG/Person/David.J.McComas
2.
MetadataContact
spase://SMWG/Person/Robert.E.McGuire
3.
MetadataContact
spase://SMWG/Person/Lee.Frost.Bargatze
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 SWEPAM Instrument Description
URL
https://doi.org/10.1023/A:1005040232597
Description
McComas, D.J., Bame, S.J., Barker, P., Feldman, W.C., Phillips, J.L., Riley, P., and J.W. Griffee, Solar Wind Electron Proton Alpha Monitor (SWEPAM) for the Advanced Composition Explorer, Space Sci. Rev., 86, 563–612, 1998
PriorIDs
spase://VSPO/NumericalData/ACE/SWEPAM/PT300S
spase://VSPO/NumericalData/P_ACE_HDR_SWEPAM_300S
spase://VSPO/NumericalData/ACE/SWEPAM/KeyParameter/PT5M
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
FTPS from SPDF (not with most browsers)
URL
ftps://spdf.gsfc.nasa.gov/pub/data/ace/swepam/level_2_cdaweb/swe_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/swepam/level_2_cdaweb/swe_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_SWE&index=sp_phys
ProductKey
AC_K0_SWE
Description
Access to ASCII, CDF, and Plots via NASA/GSFC CDAWeb
Format
CDF
Encoding
None
AccessDirectoryTemplate
https://cdaweb.gsfc.nasa.gov/pub/data/ace/swepam/level_2_cdaweb/swe_k0/$Y
AccessFilenameTemplate
ac_k0_swe_$Y$m$d_$v.cdf
Acknowledgement
D.J. McComas, Please acknowledge the Principal Investigator, D.J. McComas, Southwest Research Institute. 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_SWE/clientLibraryExample/
Style
WebService
ProductKey
AC_K0_SWE
Description
Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS.
Format
Binary
Acknowledgement
D.J. McComas, Please acknowledge the Principal Investigator, D.J. McComas, Southwest Research Institute. Please acknowledge the Data Providers and CDAWeb when using these Data.
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
CDAWeb HAPI Server
URL
https://cdaweb.gsfc.nasa.gov/hapi
Style
HAPI
ProductKey
AC_K0_SWE
Description
Web Service to this product using the HAPI interface.
Format
CSV
Acknowledgement
D.J. McComas, Please acknowledge the Principal Investigator, D.J. McComas, Southwest Research Institute. Please acknowledge the Data Providers and CDAWeb when using these Data.
ProviderProcessingLevel
Calculated
InstrumentIDs
spase://SMWG/Instrument/ACE/SWEPAM
MeasurementType
ThermalPlasma
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, Centered
Caveats
Average Type: standard 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
Solar Wind Proton Number Density
Set
Time Series defined by using: EPOCH
ParameterKey
Np
Description
Solar Wind Proton Number Density
Caveats
Np is the Solar Wind Proton Number Density in Units of cm^-3, as calculated by Integration of the Ion Distribution Function. These Data are Preliminary Values and are for Browse use only.
Cadence
PT5M
Units
cm^-3
UnitsConversion
1.0e6>m^-3
RenderingHints
DisplayType
TimeSeries
AxisLabel
SW H Num Density
ValueFormat
F6.2
ScaleMin
0.0
ScaleMax
200.0
ValidMin
0.0
ValidMax
1000.0
FillValue
-1.0e+31
Particle
ParticleType
Proton
Qualifier
Magnitude
Qualifier
Moment
ParticleQuantity
NumberDensity
AtomicNumber
1
Parameter #4
Name
Solar Wind Proton Bulk Speed
Set
Time Series defined by using: EPOCH
ParameterKey
Vp
Description
Solar Wind Proton Bulk Speed
Caveats
Vp is the Solar Wind Proton Speed, or more generally just the Solar wind Bulk Speed. It is obtained by Integration of the Ion (Proton) Distribution Function. These Data are Preliminary Values and are for Browse use only.
Cadence
PT5M
Units
km/s
UnitsConversion
1.0e3>m/s
RenderingHints
DisplayType
TimeSeries
AxisLabel
SW Bulk Speed
ValueFormat
F8.1
ScaleMin
0.0
ScaleMax
500.0
ValidMin
0.0
ValidMax
1000.0
FillValue
-1.0e+31
Particle
ParticleType
Proton
Qualifier
Moment
Qualifier
Scalar
ParticleQuantity
FlowSpeed
AtomicNumber
1
Parameter #5
Name
Solar Wind Alpha Particle to Proton Density Ratio, Percentage
Set
Time Series defined by using: EPOCH
ParameterKey
He_ratio
Description
Solar Wind Alpha Particle to Proton, He++/H+, Density Ratio, Percentage
Caveats
He_ratio is the Ratio of the Number Density of Helium++ Ions to the Number Density of Protons. These Data are Preliminary Values and are for Browse use only.
Cadence
PT5M
RenderingHints
DisplayType
TimeSeries
AxisLabel
He++/H+
ValueFormat
F7.3
ScaleMin
0.0
ScaleMax
100.0
ValidMin
0.0
ValidMax
100.0
FillValue
-1.0e+31
Particle
ParticleType
AlphaParticle
ParticleType
Proton
Qualifier
Ratio
Qualifier
Scalar
ParticleQuantity
NumberDensity
AtomicNumber
1
AtomicNumber
2
Parameter #6
Name
Solar Wind Proton Temperature, Radial
Set
Time Series defined by using: EPOCH
ParameterKey
Tpr
Description
Solar Wind Proton Temperature, Radial
Caveats
The Radial Component of the Proton Temperature is the (1,1) Component of the Temperature Tensor, along the Radial Direction. It is obtained by Integration of the Ion (Proton) Distribution Function. These Data are Preliminary Values and are for Browse use only.
Cadence
PT5M
Units
K
RenderingHints
DisplayType
TimeSeries
AxisLabel
H Temp (radical)
ValueFormat
F9.1
ScaleMin
1000.0
ScaleMax
100000.0
ValidMin
1000.0
ValidMax
1.0e+06
FillValue
-1.0e+31
Particle
ParticleType
Proton
Qualifier
Moment
Qualifier
Scalar
ParticleQuantity
Temperature
AtomicNumber
1
Parameter #7
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
F4
ScaleMin
0.0
ScaleMax
10.0
ScaleType
LinearScale
ValidMin
0.0
ValidMax
10.0
FillValue
-1.0e+31
Support
SupportQuantity
Other