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DSCOVR Faraday Cup (FC) Isotropic Maxwellian Parameters for Solar Wind Protons 1 minute averages

(2026). DSCOVR Faraday Cup (FC) Isotropic Maxwellian Parameters for Solar Wind Protons 1 minute averages. [Data set]. Space Physics Data Facility. https://doi.org/10.48322/ja0r-4j65. Accessed on .

Note: Proper references, including or other formats, should include the "Accessed on date" to identify the version of the resource being cited in a given publication.

ResourceID
spase://NOAA/NumericalData/DSCOVR/PlasMag/FaradayCup/CDF/PT1M

Description
Best Fit Parameters from Nonlinear Fitting of a single, isotropic Maxwellian Velocity Distribution Function to Sets of DSCOVR Faraday Cup Measurements of the Solar Wind Thermal Proton Peak. One Minute Resolution Data are obtained by fitting to the 1 min integrated Distributions, comprising about 15 as-measured charged Current Spectra each. Reported Uncertainties are fitting Uncertainties, which do not account for so-called prior Uncertainties associated with non-Maxwellian Distributions in Nature or with Conditions that vary on Timescales faster than 1 min. The Uncertainties associated with Measurement of charged Flux as a Function of Energy are propagated. Certain Empirical Corrections have been applied.

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Version:2.7.1

NumericalData

ResourceID
spase://NOAA/NumericalData/DSCOVR/PlasMag/FaradayCup/CDF/PT1M
NamingAuthority
NOAA
ResourceType
NumericalData
ResourceHeader
ResourceName
DSCOVR Faraday Cup (FC) Isotropic Maxwellian Parameters for Solar Wind Protons 1 minute averages
DOI
https://doi.org/10.48322/ja0r-4j65
ReleaseDate
2026-07-29 11:08:00Z
RevisionHistory
RevisionEvent
ReleaseDate
2026-07-24 13:09:42
Note
Added DOI TLK
RevisionEvent
ReleaseDate
2026-07-29 11:08:00
Note
Adding publication info TLK
Description
Best Fit Parameters from Nonlinear Fitting of a single, isotropic Maxwellian Velocity Distribution Function to Sets of DSCOVR Faraday Cup Measurements of the Solar Wind Thermal Proton Peak. One Minute Resolution Data are obtained by fitting to the 1 min integrated Distributions, comprising about 15 as-measured charged Current Spectra each. Reported Uncertainties are fitting Uncertainties, which do not account for so-called prior Uncertainties associated with non-Maxwellian Distributions in Nature or with Conditions that vary on Timescales faster than 1 min. The Uncertainties associated with Measurement of charged Flux as a Function of Energy are propagated. Certain Empirical Corrections have been applied.
Acknowledgement
J.C. Kasper, M.L. Stevens, A.W. Case, This Research has made use of Deep Space Climate Observatory (DSCOVR) Faraday Cup Experiment Science Data. These Data are provided by the Space Plasma Group at the Smithsonian Astrophysical Observatory under NASA Grant NNX17AC98G. The DSCOVR Mission is a Project of the U.S. National Oceanic and Atmospheric Administration.
PublicationInfo
Authors
Justin C. Kasper, Michael L. Stevens and Anthony W. Case
PublicationDate
2026-07-29 11:08:00Z
PublishedBy
Space Physics Data Facility
Contacts
Role Person StartDate StopDate Note
1. PrincipalInvestigator spase://SMWG/Person/Justin.C.Kasper
2. PrincipalInvestigator spase://SMWG/Person/Michael.L.Stevens
3. PrincipalInvestigator spase://SMWG/Person/Anthony.W.Case
4. MetadataContact spase://SMWG/Person/Robert.E.McGuire
5. MetadataContact spase://SMWG/Person/Lee.Frost.Bargatze

InformationURL
Name
Deep Space Climate Observatory, DSCOVR, Web Page, NESDIS, NOAA
URL
https://www.nesdis.noaa.gov/content/dscovr-deep-space-climate-observatory
Description
Deep Space Climate Observatory, DSCOVR, Web Page hosted by the National Environmental Satellite, Data, and Information Service, NESDIS, National Oceanic and Atmospheric Administration, NOAA
PriorIDs
spase://VSPO/NumericalData/DSCOVR/PlasMag/FaradayCup/PT1M
spase://NOAA/NumericalData/DSCOVR/PlasMag/FaradayCup/PT1M
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF
Availability
Online
AccessRights
Open
AccessURL
Name
FTP access to files at SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/dscovr/h1/faraday_cup/
Description
In CDF via ftp from SPDF.
AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/dscovr/h1/faraday_cup/
Description
In CDF via http from SPDF.
AccessURL
Name
CDAWeb
URL
https://cdaweb.gsfc.nasa.gov/index.html/
ProductKey
DSCOVR_H1_FC
Description
Access to ASCII, CDF, and plots via NASA/GSFC CDAWeb
Format
CDF
Encoding
None
AccessDirectoryTemplate
https://cdaweb.gsfc.nasa.gov/pub/data/dscovr/h1/faraday_cup/$Y
AccessFilenameTemplate
dscovr_h1_fc_$Y$m$d_$v.cdf
Acknowledgement
J.C. Kasper, M.L. Stevens, A.W. Case, This Research has made use of Deep Space Climate Observatory (DSCOVR) Faraday Cup Experiment Science Data. These Data are provided by the Space Plasma Group at the Smithsonian Astrophysical Observatory under NASA Grant NNX17AC98G. The DSCOVR Mission is a Project of the U.S. National Oceanic and Atmospheric Administration.. 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/DSCOVR_H1_FC/clientLibraryExample/
Style
WebService
ProductKey
DSCOVR_H1_FC
Description
Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS.
Format
Binary
Acknowledgement
J.C. Kasper, M.L. Stevens, A.W. Case, This Research has made use of Deep Space Climate Observatory (DSCOVR) Faraday Cup Experiment Science Data. These Data are provided by the Space Plasma Group at the Smithsonian Astrophysical Observatory under NASA Grant NNX17AC98G. The DSCOVR Mission is a Project of the U.S. National Oceanic and Atmospheric Administration.. 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 HAPI Server
URL
https://cdaweb.gsfc.nasa.gov/hapi
Style
HAPI
ProductKey
DSCOVR_H1_FC
Description
Web Service to this product using the HAPI interface.
Format
CSV
Acknowledgement
J.C. Kasper, M.L. Stevens, A.W. Case, This Research has made use of Deep Space Climate Observatory (DSCOVR) Faraday Cup Experiment Science Data. These Data are provided by the Space Plasma Group at the Smithsonian Astrophysical Observatory under NASA Grant NNX17AC98G. The DSCOVR Mission is a Project of the U.S. National Oceanic and Atmospheric Administration.. Please acknowledge the data providers and CDAWeb when using these data.
ProcessingLevel
Calibrated
InstrumentIDs
spase://SMWG/Instrument/DSCOVR/PlasMag/FaradayCup
MeasurementType
EnergeticParticles
TemporalDescription
TimeSpan
StartDate
2016-06-03 00:00:00.000
RelativeStopDate
-P2M
Cadence
PT1M
ObservedRegion
Heliosphere
ObservedRegion
Heliosphere.NearEarth
ObservedRegion
Heliosphere.Inner
Parameter #1
Name
Epoch
ParameterKey
Epoch
Description
Epoch, Universal Time, UT
Caveats
One minute cadence time (UT). This parameter exhibits an increasing monotonic progression.
Cadence
PT1M
Units
s
RenderingHints
DisplayType
TimeSeries
AxisLabel
Epoch
ScaleType
LinearScale
ValidMin
2010-01-01T00:00:00.000000000
ValidMax
2030-01-01T00:00:01.999000000
FillValue
9999-12-31T23:59:59.999999999
Support
SupportQuantity
Temporal
Parameter #2
Name
Time PB5
Set
Time series defined by using: EPOCH
ParameterKey
Time_PB5
Description
Time in PB5 Format: Year, Day, Milliseconds, Centered
Cadence
PT1M
RenderingHints
ValueFormat
I8
ScaleType
LinearScale
Structure
Size
3
Element
Name
Element 1
Index
1
Units
year
ValidMin
2010
ValidMax
2030
RenderingHints
AxisLabel
year
Element
Name
Element 2
Index
2
Units
d
ValidMin
1
ValidMax
365
RenderingHints
AxisLabel
day
Element
Name
Element 3
Index
3
Units
ms
ValidMin
0
ValidMax
86399000
RenderingHints
AxisLabel
ms
FillValue
4294967295
Support
SupportQuantity
Temporal
Parameter #3
Name
Quality Flag: Data
Set
Time series defined by using: EPOCH
ParameterKey
DQF
Description
Data Quality Flag: 0=Good, 1=Bad
Cadence
PT1M
RenderingHints
AxisLabel
DQ FLAG
ValueFormat
I1
ScaleType
LinearScale
ValidMin
0
ValidMax
1
FillValue
4294967295
Support
SupportQuantity
Other
Parameter #4
Name
Solar Wind Proton Velocity Vector, with Errors Bars, GSE
Set
Time series defined by using: EPOCH
ParameterKey
V_GSE
Description
Solar Wind Proton Velocity Vector, with Error Bars, Geocentric Solar Ecliptic, GSE, Cartesian Coordinates
Caveats
The proton solar winds' velocity in GSE coord (km/s)
Cadence
PT1M
Units
km/s
UnitsConversion
1e3>m/s
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
RenderingHints
DisplayType
TimeSeries
ValueFormat
F8.1
ScaleType
LinearScale
Structure
Size
3
Element
Name
VX (GSE)
Index
1
ValidMin
-1800.0
ValidMax
0.0
RenderingHints
AxisLabel
x
Element
Name
VY (GSE)
Index
2
ValidMin
-900.0
ValidMax
900.0
RenderingHints
AxisLabel
y
Element
Name
VZ (GSE)
Index
3
ValidMin
-900.0
ValidMax
900.0
RenderingHints
AxisLabel
z
FillValue
-1.0e+31
Particle
ParticleType
Proton
Qualifier
Vector
Qualifier
Uncertainty
ParticleQuantity
Velocity
Parameter #5
Name
Solar Wind Proton Velocity Vector, GSE
Set
Time series defined by using: EPOCH
ParameterKey
V_GSE_NoError
Description
Solar Wind Proton Velocity Vector, Geocentric Solar Ecliptic, GSE, Cartesian Coordinates
Caveats
The proton solar winds' velocity in GSE coord (km/s) This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: V_GSE.
Cadence
PT1M
Units
km/s
UnitsConversion
1e3>m/s
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
RenderingHints
DisplayType
TimeSeries
ValueFormat
F8.1
ScaleType
LinearScale
Structure
Size
3
Element
Name
VX (GSE)
Index
1
ValidMin
-1800.0
ValidMax
0.0
RenderingHints
AxisLabel
x
Element
Name
VY (GSE)
Index
2
ValidMin
-900.0
ValidMax
900.0
RenderingHints
AxisLabel
y
Element
Name
VZ (GSE)
Index
3
ValidMin
-900.0
ValidMax
900.0
RenderingHints
AxisLabel
z
FillValue
-1.0e+31
Particle
ParticleType
Proton
Qualifier
Vector
ParticleQuantity
Velocity
Parameter #6
Name
Solar Wind Proton Velocity Vector, Uncertainty, GSE
Set
Time series defined by using: EPOCH
ParameterKey
V_GSE_DELTA
Description
Solar Wind Proton Velocity Vector, Uncertainty, Geocentric Solar Ecliptic, GSE, Cartesian Coordinates
Caveats
The proton solar winds' velocity uncertainty in GSE coord (km/s)
Cadence
PT1M
Units
km/s
UnitsConversion
1e3>m/s
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
RenderingHints
ValueFormat
F8.1
ScaleType
LinearScale
Structure
Size
3
Element
Name
Unc. VX (GSE)
Index
1
RenderingHints
AxisLabel
x
Element
Name
Unc. VY (GSE)
Index
2
RenderingHints
AxisLabel
y
Element
Name
Unc. VZ (GSE)
Index
3
RenderingHints
AxisLabel
z
ValidMin
0.0
ValidMax
1800.0
FillValue
-1.0e+31
Particle
ParticleType
Proton
Qualifier
Vector
Qualifier
Uncertainty
ParticleQuantity
Velocity
Parameter #7
Name
Solar Wind Proton Thermal Speed, with Error Bars
Set
Time series defined by using: EPOCH
ParameterKey
THERMAL_SPD
Description
Solar Wind Proton, Most Probable Thermal Speed, with Error Bars
Caveats
Thermal width of the velocity peak component perpendicular to the sensor axis, which is approximately radial from the sun.
Cadence
PT1M
Units
km/s
UnitsConversion
1e3>m/s
RenderingHints
DisplayType
TimeSeries
AxisLabel
SW Vth
ValueFormat
F6.1
ScaleType
LinearScale
ValidMin
0.0
ValidMax
1000.0
FillValue
-1.0e+31
Particle
ParticleType
Proton
Qualifier
Scalar
Qualifier
Uncertainty
ParticleQuantity
ThermalSpeed
Parameter #8
Name
Solar Wind Proton Thermal Speed
Set
Time series defined by using: EPOCH
ParameterKey
THERMAL_SPD_NoError
Description
Solar Wind Proton, Most Probable Thermal Speed
Caveats
Thermal width of the velocity peak component perpendicular to the sensor axis, which is approximately radial from the sun. This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: THERMAL_SPD.
Cadence
PT1M
Units
km/s
UnitsConversion
1e3>m/s
RenderingHints
DisplayType
TimeSeries
AxisLabel
SW Vth
ValueFormat
F6.1
ScaleType
LinearScale
ValidMin
0.0
ValidMax
1000.0
FillValue
-1.0e+31
Particle
ParticleType
Proton
Qualifier
Scalar
ParticleQuantity
ThermalSpeed
Parameter #9
Name
Solar Wind Proton Thermal Speed, Uncertainty
Set
Time series defined by using: EPOCH
ParameterKey
THERMAL_SPD_DELTA
Description
Uncertainty in Thermal Proton Speed
Cadence
PT1M
RenderingHints
AxisLabel
Unc. SW Vth
ValueFormat
F6.1
ScaleType
LinearScale
ValidMin
0.0
ValidMax
1000.0
FillValue
-1.0e+31
Particle
ParticleType
Proton
Qualifier
Scalar
Qualifier
Uncertainty
ParticleQuantity
ThermalSpeed
Parameter #10
Name
Solar Wind Proton Density, with Error Bars
Set
Time series defined by using: EPOCH
ParameterKey
Np
Description
Solar Wind Density, with Error Bars
Cadence
PT1M
Units
cm^-3
UnitsConversion
1e6>m^-3
RenderingHints
DisplayType
TimeSeries
AxisLabel
Ion N
ValueFormat
F7.1
ScaleType
LinearScale
ValidMin
0.0
ValidMax
1000.0
FillValue
-1.0e+31
Particle
ParticleType
Proton
Qualifier
Scalar
Qualifier
Uncertainty
ParticleQuantity
NumberDensity
Parameter #11
Name
Solar Wind Proton Density
Set
Time series defined by using: EPOCH
ParameterKey
Np_NoError
Description
Solar Wind Density
Caveats
This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: Np.
Cadence
PT1M
Units
cm^-3
UnitsConversion
1e6>m^-3
RenderingHints
DisplayType
TimeSeries
AxisLabel
Ion N
ValueFormat
F7.1
ScaleType
LinearScale
ValidMin
0.0
ValidMax
1000.0
FillValue
-1.0e+31
Particle
ParticleType
Proton
Qualifier
Scalar
ParticleQuantity
NumberDensity
Parameter #12
Name
Solar Wind Proton Density, Uncertainty
Set
Time series defined by using: EPOCH
ParameterKey
Np_DELTA
Description
Solar Wind Density, Uncertainty
Cadence
PT1M
Units
cm^-3
UnitsConversion
1e6>m^-3
RenderingHints
AxisLabel
Unc. Ion N
ValueFormat
F7.1
ScaleType
LinearScale
ValidMin
0.0
ValidMax
1000.0
FillValue
-1.0e+31
Particle
ParticleType
Proton
Qualifier
Scalar
Qualifier
Uncertainty
ParticleQuantity
NumberDensity
Parameter #13
Name
Solar Wind Proton Temperature, with Error Bars
Set
Time series defined by using: EPOCH
ParameterKey
THERMAL_TEMP
Description
Solar Wind Proton Temperature, with Error Bars
Caveats
Thermal width of the velocity peak component perpendicular to the sensor axis, which is approximately radial from the sun.
Cadence
PT1M
Units
°K
RenderingHints
DisplayType
TimeSeries
AxisLabel
Temperature
ValueFormat
F11.2
ValidMin
0.0
ValidMax
2.0e+06
FillValue
-1.0e+31
Particle
ParticleType
Proton
Qualifier
Scalar
Qualifier
Uncertainty
ParticleQuantity
Temperature
Parameter #14
Name
Solar Wind Proton Temperature
Set
Time series defined by using: EPOCH
ParameterKey
THERMAL_TEMP_NoError
Description
Solar Wind Proton Temperature
Caveats
Thermal width of the velocity peak component perpendicular to the sensor axis, which is approximately radial from the sun. This parameter is virtual. It is calculated by calling the function ALTERNATE_VIEW with the following input parameters: THERMAL_TEMP.
Cadence
PT1M
Units
°K
RenderingHints
DisplayType
TimeSeries
AxisLabel
Temperature
ValueFormat
F11.2
ValidMin
0.0
ValidMax
2.0e+06
FillValue
-1.0e+31
Particle
ParticleType
Proton
Qualifier
Scalar
ParticleQuantity
Temperature
Parameter #15
Name
Solar Wind Proton Temperature Uncertainty
Set
Time series defined by using: EPOCH
ParameterKey
THERMAL_TEMP_DELTA
Description
Solar Wind Proton Temperature, Uncertainty
Cadence
PT1M
Units
°K
RenderingHints
AxisLabel
Unc. Temperature
ValueFormat
F11.2
ValidMin
0.0
ValidMax
2.0e+06
FillValue
-1.0e+31
Particle
ParticleType
Proton
Qualifier
Scalar
Qualifier
Uncertainty
ParticleQuantity
Temperature
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Last Updated: 2026-07-29