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Data Access
FTPS from SPDF (not with most browsers)
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CDAWeb
WebService:
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HAPI: CDAWeb HAPI Server
STEREO Science Center - CDF
STEREO-A PLasma and Supra-Thermal Ion Composition (PLASTIC) He⁺ Counts and Relative Energy Flux in four Velocity Ranges normalized by the Solar Wind Speed, Level 3 (L3), Daily Data
var authors='Galvin, Antoinette, B.';
document.write(authors);
(2023).
STEREO-A PLasma and Supra-Thermal Ion Composition (PLASTIC) He⁺ Counts and Relative Energy Flux in four Velocity Ranges normalized by the Solar Wind Speed, Level 3 (L3), Daily Data.
[Data set].
Goddard Space Flight Center.
https://doi.org/10.48322/p8nz-hw11. Accessed on document.write(currentDateStr);.
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ResourceID
spase://NASA/NumericalData/STEREO-A/PLASTIC/HeliumPlusParameter/P1D
Description
STEREO-A Plasma and Suprathermal Ion Composition, Singly-charged Helium, He⁺, counts and relative differential energy fluxes binned by the ion speed relative to the solar wind bulk speed, four speed ratio bins. STEREO PLASTIC daily suprathermal He⁺ pickup ion signatures include He⁺ energy spectra, directional information, and contenxt information, such as the H⁺ plasma velocity. The four speed ratio, V/Vsw, bin ranges of are: 1.44 to 1.85, 1.85 to 2.50, 2.50 to 3.50, and 3.50 to 8.00. The identification of He⁺ is based on the measurement of energy per charge, E/q, time-of-flight, TOF, and total energy deposited in the solid state detector, SSD. These data include double coincidence measurements by using E/Qi and TOF and triple coincidence measurements by using E/Q, TOF, and SSD, see for example Galvin et al., Space Sci. Rev. 136, p 437-468, 2008. The proton bulk parameters including speed, Vsw, thermal velocity, Vth, and Density, Np, in this file are derived from a one-deminsional, 1-D, Maxwellian fit to a single detector rate with no coincidence required. These proton bulk parameters are corrected for background and dead time. The software version number used to derive the proton bulk parameters is shown in the file header and is described in the section on file formats. The most recent update of the proton bulk parameters can be found on the following STEREO website: http://stereo-ssc.nascom.nasa.gov/data/ins_data/plastic/level2/Protons/ For a full explanation, see the description at: https://stereo-ssc.nascom.nasa.gov/data/ins_data/plastic/level3/HePlus/HePlus_flux/READ_ME_PLASTIC_HePlus_Fluxes.pdf The singly-charged Helium, He⁺, flux data are also available from the STEREO Science Center in ASCII format via: https://stereo-ssc.nascom.nasa.gov/data/ins_data/plastic/level3/HePlus/ Note that this SPASE Numerical Description only describes the MESSENGER Magnetometer data stored in Common Data Files.
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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Version:2.7.1
NumericalData
ResourceID
spase://NASA/NumericalData/STEREO-A/PLASTIC/HeliumPlusParameter/P1D
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
STEREO-A PLasma and Supra-Thermal Ion Composition (PLASTIC) He⁺ Counts and Relative Energy Flux in four Velocity Ranges normalized by the Solar Wind Speed, Level 3 (L3), Daily Data
DOI
https://doi.org/10.48322/p8nz-hw11
ReleaseDate
2026-06-26 13:28:17Z
RevisionHistory
RevisionEvent
ReleaseDate
2021-04-27 15:38:11Z
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2023-07-30 12:34:56.789Z
Note
Added DOI and PublicationInfo minted by LFB, metadata versioned up to SPASE 2.6.0, reviewed by LFB 20230727
RevisionEvent
ReleaseDate
2025-10-03 10:49:12Z
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 13:31:34Z
Note
Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB
RevisionEvent
ReleaseDate
2026-06-26 13:28:17Z
Note
Add 'Z' to RevisionEvent:ReleaseDate(s), PublicationDate, TemporalDescription:TimeSpan:StartDate, TemporalDescription:TimeSpan:StopDate. ZCB
Description
STEREO-A Plasma and Suprathermal Ion Composition, Singly-charged Helium, He⁺, counts and relative differential energy fluxes binned by the ion speed relative to the solar wind bulk speed, four speed ratio bins. STEREO PLASTIC daily suprathermal He⁺ pickup ion signatures include He⁺ energy spectra, directional information, and contenxt information, such as the H⁺ plasma velocity. The four speed ratio, V/Vsw, bin ranges of are: 1.44 to 1.85, 1.85 to 2.50, 2.50 to 3.50, and 3.50 to 8.00. The identification of He⁺ is based on the measurement of energy per charge, E/q, time-of-flight, TOF, and total energy deposited in the solid state detector, SSD. These data include double coincidence measurements by using E/Qi and TOF and triple coincidence measurements by using E/Q, TOF, and SSD, see for example Galvin et al., Space Sci. Rev. 136, p 437-468, 2008. The proton bulk parameters including speed, Vsw, thermal velocity, Vth, and Density, Np, in this file are derived from a one-deminsional, 1-D, Maxwellian fit to a single detector rate with no coincidence required. These proton bulk parameters are corrected for background and dead time. The software version number used to derive the proton bulk parameters is shown in the file header and is described in the section on file formats. The most recent update of the proton bulk parameters can be found on the following STEREO website: http://stereo-ssc.nascom.nasa.gov/data/ins_data/plastic/level2/Protons/ For a full explanation, see the description at: https://stereo-ssc.nascom.nasa.gov/data/ins_data/plastic/level3/HePlus/HePlus_flux/READ_ME_PLASTIC_HePlus_Fluxes.pdf The singly-charged Helium, He⁺, flux data are also available from the STEREO Science Center in ASCII format via: https://stereo-ssc.nascom.nasa.gov/data/ins_data/plastic/level3/HePlus/ Note that this SPASE Numerical Description only describes the MESSENGER Magnetometer data stored in Common Data Files.
Acknowledgement
Please acknowledge the Principal Investigator, Dr. Antoinette Galvin of the University of New Hampshire, and NASA contract NAS5-00132.. See the rules of use available at http://stereo.sr.unh.edu/data/PLASTIC_Resources/index.htm.
PublicationInfo
Authors
Galvin, Antoinette, B.
PublicationDate
2023-01-01 00:00:00Z
PublishedBy
Goddard Space Flight Center
Contacts
Role
Person
StartDate
StopDate
Note
1.
PrincipalInvestigator
spase://SMWG/Person/Antoinette.B.Galvin
2.
MetadataContact
spase://SMWG/Person/Robert.M.Candey
3.
MetadataContact
spase://SMWG/Person/Lee.Frost.Bargatze
InformationURL
Name
STEREO PLASTIC Instrument web site, UNH
URL
http://stereo.sr.unh.edu/stereo.html
Description
STEREO Plasma and Supra-Thermal Ion Composition, PLASTIC, instrument web site, release notes, status, and other information, hosted by University of New Hampshire, UNH
Language
en
InformationURL
Name
STEREO PLASTIC Index web site, UNH
URL
http://stereo.sr.unh.edu/data/PLASTIC_Resources/index.htm
Description
STEREO PLASTIC instrument resources web site, hosted by University of New Hampshire, UNH
Language
en
InformationURL
Name
NSSDC Master Catalog, STEREO A, PLASTIC instrument
URL
https://nssdc.gsfc.nasa.gov/nmc/experiment/display.action?id=2006-047A-04
Description
General information concerning the STEREO A, Plasma and Supra-Thermal Ion Composition, PLASTIC, instrument
Language
en
InformationURL
Name
STEREO PLASTIC He⁺ Fluxes Readme file, UNH
URL
https://stereo-ssc.nascom.nasa.gov/data/ins_data/plastic/level3/HePlus/HePlus_flux/READ_ME_PLASTIC_HePlus_Fluxes.pdf
Description
Readme for STEREO PLASTIC daily suprathermal He⁺ relative fluxes, last update: November 06, 2017
Language
en
PriorIDs
spase://VSPO/NumericalData/STEREO-A/PLASTIC/he_plus_parameters/24HR
spase://VSPO/NumericalData/STEREO-A/PLASTIC/HeliumPlusParameter/P1D
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/stereo/ahead/l3/plastic/heplus/24hr/
Description
Access to Data in CDF Format via ftp from SPDF
AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/stereo/ahead/l3/plastic/heplus/24hr/
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=STA_L3_PLA_HEPLUS_24HR&index=sp_phys
ProductKey
STA_L3_PLA_HEPLUS_24HR
Description
Access to ASCII, CDF, and Plots via NASA/GSFC CDAWeb
Format
CDF
Encoding
None
AccessDirectoryTemplate
https://cdaweb.gsfc.nasa.gov/pub/data/stereo/ahead/l3/plastic/heplus/24hr/$Y
AccessFilenameTemplate
sta_l3_pla_heplus_24hr_$Y$m$d_$v.cdf
Acknowledgement
Please acknowledge the Principal Investigator A.B. Galvin. 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/STA_L3_PLA_HEPLUS_24HR/clientLibraryExample/
Style
WebService
ProductKey
STA_L3_PLA_HEPLUS_24HR
Description
Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS.
Format
Binary
Acknowledgement
Please acknowledge the Principal Investigator A.B. Galvin. 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
STA_L3_PLA_HEPLUS_24HR
Description
Web Service to this product using the HAPI interface.
Format
CSV
Acknowledgement
Please acknowledge the Principal Investigator A.B. Galvin. Please acknowledge the Data Providers and CDAWeb when using these Data.
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/STEREO_SC
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
STEREO Science Center - CDF
URL
https://stereo-ssc.nascom.nasa.gov/data/ins_data/plastic/level3/HePlus/HePlus_flux/CDFs/
Format
CDF
ProcessingLevel
Calibrated
InstrumentIDs
spase://SMWG/Instrument/STEREO-A/PLASTIC
MeasurementType
EnergeticParticles
MeasurementType
ThermalPlasma
TemporalDescription
TimeSpan
StartDate
2007-04-01 00:00:00.000Z
StopDate
2017-07-31 00:00:00.000Z
Cadence
P1D
ObservedRegion
Heliosphere.Remote1AU
Parameter #1
Name
Epoch Time, since 0 AD
ParameterKey
epoch
Description
Epoch Time Tags, time since 0 AD, beginning of interval
Caveats
This Parameter exhibits an increasing Monotonic Progression
Cadence
P1D
Units
ms
UnitsConversion
1.0e-3>s
RenderingHints
AxisLabel
Epoch
ValueFormat
E14.8
ScaleType
LinearScale
ValidMin
01-Jan-1990 00:00:00.000
ValidMax
31-Dec-2030 00:00:00.000
FillValue
31-Dec-9999 23:59:59.999
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
P1D
RenderingHints
ScaleType
LinearScale
Structure
Size
3
Element
Name
Year
Index
1
Units
a
ValidMin
1997
ValidMax
2030
Element
Name
Day of Year (Jan 1 = Day 1)
Index
2
Units
d
ValidMin
237
ValidMax
365
Element
Name
Elapsed milliseconds of day
Index
3
Units
ms
ValidMin
0
ValidMax
0
FillValue
-2147483648
Support
Qualifier
Array
SupportQuantity
Temporal
Parameter #3
Name
Data Processing Date
ParameterKey
processing_date
Description
Data Processing Date
Caveats
The date and time when the CDF was created
Cadence
P1D
RenderingHints
AxisLabel
Processing_date
ValueFormat
A32
ValidMin
01-Jan-2007 00:00:00.000
ValidMax
31-Dec-2030 00:00:00.000
Support
SupportQuantity
Temporal
Parameter #4
Name
Data Input File
ParameterKey
input_file
Description
Data Input File
Cadence
P1D
RenderingHints
AxisLabel
Input_file
ValueFormat
A34
Support
SupportQuantity
Other
Parameter #5
Name
Proton Bulk Speed, 1-D Fit
Set
Time series defined by using: EPOCH
ParameterKey
proton_bulk_speed
Description
Proton Bulk Speed, from one-dimensional Maxwellian Fit
Cadence
P1D
Units
km/s
UnitsConversion
1.0e3>m/s
RenderingHints
DisplayType
TimeSeries
AxisLabel
Proton Speed
ValueFormat
E11.3
ValidMin
200.0
ValidMax
3000.0
FillValue
-1.0e+31
Particle
ParticleType
Proton
Qualifier
Scalar
ParticleQuantity
Velocity
AtomicNumber
1
Parameter #6
Name
Proton Thermal Speed, 1-D Fit
Set
Time series defined by using: EPOCH
ParameterKey
proton_thermal_speed
Description
Proton Thermal Speed, from one-dimensional Maxwellian Fit
Cadence
PT1M
Units
km/s
UnitsConversion
1.0e3>m/s
RenderingHints
DisplayType
TimeSeries
AxisLabel
Proton Thermal_Speed
ValueFormat
E9.2
ValidMin
0.0
ValidMax
500.0
FillValue
-1.0e+31
Particle
ParticleType
Proton
Qualifier
Scalar
ParticleQuantity
ThermalSpeed
AtomicNumber
1
Parameter #7
Name
Proton Number Density, 1-D Fit
Set
Time series defined by using: EPOCH
ParameterKey
proton_number_density
Description
Proton Number Density, from one-dimensional Maxwellian Fit
Cadence
P1D
Units
cm^-3
UnitsConversion
1.0e6>m^-3
RenderingHints
DisplayType
TimeSeries
AxisLabel
Proton No. Density
ValueFormat
E9.2
ValidMin
0.0
ValidMax
500.0
FillValue
-1.0e+31
Particle
ParticleType
Proton
Qualifier
Scalar
ParticleQuantity
NumberDensity
AtomicNumber
1
Parameter #8
Name
Singly charged Helium, Relative Energy Flux
Set
Time series defined by using: EPOCH
ParameterKey
he_plus_rel_energy_flux
Description
Singly charged Helium, He⁺, Relative Energy Flux in four ranges of the ion velocity divided by the solar wind bulk speed, V/Vsw.
Caveats
Range 0: 8.00>V/Vsw>3.50, Range 1: 3.50>V/Vsw>2.50, Range 2: 2.50>V/Vsw>1.85, Range 3: 1.85>V/Vsw>1.44, unit proportional to differential energy flux: keV/(cm^ sr keV)
Cadence
P1D
Units
s^-1
RenderingHints
DisplayType
TimeSeries
ValueFormat
E9.2
Structure
Size
4
Element
Name
He+_Rel_EFlux_8.0>V/Vsw>3.5
Index
1
Element
Name
He+_Rel_EFlux_3.5>V/Vsw>2.5
Index
2
Element
Name
He+_Rel_EFlux_2.5>V/Vsw>1.85
Index
3
Element
Name
He+_Rel_EFlux_1.85>V/Vsw>1.44
Index
4
ValidMin
0.0
ValidMax
300.0
FillValue
-1.0e+31
Particle
ParticleType
Ion
Qualifier
Array
ParticleQuantity
NumberFlux
AtomicNumber
2
Parameter #9
Name
Singly charged Helium, Counts
Set
Time series defined by using: EPOCH
ParameterKey
he_plus_counts
Description
Singly charged Helium, He⁺, Counts in four ranges of the ion velocity divided by the solar wind bulk speed, V/Vsw.
Caveats
Range 0: 8.00>V/Vsw>3.50, Range 1: 3.50>V/Vsw>2.50, Range 2: 2.50>V/Vsw>1.85, Range 3: 1.85>V/Vsw>1.44, unit proportional to differential energy flux: keV/(cm^ sr keV)
Cadence
P1D
RenderingHints
DisplayType
TimeSeries
ValueFormat
E9.2
Structure
Size
4
Element
Name
He+_Cts_8.0>V/Vsw>3.5
Index
1
Element
Name
He+_Cts_3.5>V/Vsw>2.5
Index
2
Element
Name
He+_Cts_2.5>V/Vsw>1.85
Index
3
Element
Name
He+_Cts_1.85>V/Vsw>1.44
Index
4
ValidMin
0.0
ValidMax
200000.0
FillValue
-1.0e+31
Particle
ParticleType
Ion
Qualifier
Array
ParticleQuantity
Counts
AtomicNumber
2