Version:2.7.2
NumericalData
ResourceID
spase://JAXA/NumericalData/Geotail/CPI/SWA/PT48S
NamingAuthority
JAXA
ResourceType
NumericalData
ResourceHeader
ResourceName
Geotail CPI Definitive Solar Wind Moments
ReleaseDate
2026-11-04 16:08:36Z
RevisionHistory
RevisionEvent
ReleaseDate
2021-04-27 17:52:35Z
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2026-11-04 16:08:36Z
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. Add 'Z' to TemporalDescription:TimeSpan:StartDate. ZCB
Description
The CPI Solar Wind analyzer definitive plasma moments. The CPI/SW data are good in the solar wind and may be usefull in the magnetosheath.
Contacts
InformationURL
Name
CPI Survey Plots
URL
Description
Geotail CPI description and survey plots.
PriorIDs
spase://VMO/NumericalData/Geotail/CPI/UIOWA_PT48S
spase://VMO/NumericalData/Geotail/CPI/SWA_PT48S
spase://VSPO/NumericalData/Geotail/CPI/SWA/PT48S
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
FTPS from SPDF (not with most browsers)
URL
AccessURL
Name
HTTPS from SPDF
URL
Description
In CDF via HTTP from SPDF
AccessURL
Name
CDAWeb
URL
ProductKey
GE_H0_CPI
Format
CDF
Encoding
None
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb HAPI Server
URL
Style
HAPI
ProductKey
GE_H0_CPI
Description
Web Service to this product using the HAPI interface.
Format
CSV
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
University of Iowa: Geotail CPI SW data
URL
Format
Text
Encoding
ASCII
AccessInformation
RepositoryID
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
Style
Overview
ProductKey
GE_H0_CPI
Description
Endpoint to access the data from HelioCloud. Data is split into one CSV file per year.
Format
CSV
Encoding
S3_BUCKET
InstrumentIDs
MeasurementType
ThermalPlasma
MeasurementType
IonComposition
TemporalDescription
TimeSpan
StartDate
1992-09-28 00:00:33Z
RelativeStopDate
-P2M
Cadence
PT48S
ObservedRegion
Heliosphere.NearEarth
ObservedRegion
Earth.Magnetosheath
Caveats
The CPI solar wind ion analyzer is an E/Q analyzer and the initial distribution functions were calculated assuming that the plasma is H+. Care must be taken when multi-component plasmas are present. If He++ is present and is flowing with the same speed as the H+ component, it will contribute to the distribution function at twice the velocity (four times the energy) of the H+. To facilitate the automated processing of the data the integral was evaluated between vmin = 171 km/s and vmax = 1.35 × u . The resulting temperatures produce excellent fits to the observations. When He++ is present the distribution functions are consistent with an He++ temperature, THe++ = 4 × TH+, i.e., the H+ and He++ have similar thermal velocities.
Parameter #1
Name
Time
ParameterKey
Epoch
Description
Time in milliseconds, centered, since CDF Epoch
Units
ms
UnitsConversion
1e-3>s
ValidMin
08-Sep-1992 00:00:00.000
ValidMax
31-Dec-2020 20:00:00.000
FillValue
-1.0E31
Support
Parameter #2
Name
Vi GSE (r,theta,phi)
ParameterKey
SW_V
Description
Ion bulk flow velocity vector in spherical GSE coordinates
Caveats
From 5 deg angular bins
Units
km/s
UnitsConversion
1e3>m/s
CoordinateSystem
CoordinateRepresentation
Spherical
CoordinateSystemName
GSE
RenderingHints
Structure
Size
3
Element
Name
Vr
Qualifier
Magnitude
Index
1
Units
km/s
ValidMin
0.0
ValidMax
1200.0
FillValue
-1.0E31
Element
Name
Vtheta
Qualifier
DirectionAngle.ElevationAngle
Index
2
Units
deg
ValidMin
0.0
ValidMax
180.0
FillValue
-1.0E31
Element
Name
Vphi
Qualifier
DirectionAngle.AzimuthAngle
Index
3
Units
deg
ValidMin
0.0
ValidMax
360.0
FillValue
-1.0E31
Particle
ParticleType
Proton
ParticleType
AlphaParticle
ParticleType
Ion
Qualifier
Moment
Qualifier
Vector
ParticleQuantity
FlowVelocity
Parameter #3
Name
Vi GSE
ParameterKey
SW_Vc
Description
Ion bulk flow velocity vector in GSE cartesian coordinates
Caveats
From 5 deg angular bins
Units
km/s
UnitsConversion
1e3>m/s
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
RenderingHints
Structure
Size
3
Element
Name
Vx
Qualifier
Component.I
Index
1
ValidMin
-1400.0
ValidMax
1400.0
FillValue
-1.0E31
Element
Name
Vy
Qualifier
Component.J
Index
2
ValidMin
-1400.0
ValidMax
1400.0
FillValue
-1.0E31
Element
Name
Vz
Qualifier
Component.K
Index
3
ValidMin
-1400.0
ValidMax
1400.0
FillValue
-1.0E31
Particle
ParticleType
Proton
ParticleType
AlphaParticle
ParticleType
Ion
Qualifier
Moment
Qualifier
Vector
ParticleQuantity
FlowVelocity
Parameter #4
Name
Ti
ParameterKey
SW_T
Description
Kinetic temperature of hydrogen component of solar wind, scalar
Caveats
Calculated by integrating the distribution function
Units
Component.K
RenderingHints
ValidMin
10000.0
ValidMax
1.0E7
FillValue
-1.0E31
Particle
ParticleType
Proton
Qualifier
Moment
Qualifier
Scalar
ParticleQuantity
Temperature
Parameter #5
Name
Np
ParameterKey
SW_P_Den
Description
Ion number density (SWA), scalar
Caveats
Assuming no helium (0.3 - several hundred) if the density is less than 0.3/cc the higher moments (velocity, temperature) shall not be used because of the poor counting statistics.
Units
cm^-3
UnitsConversion
1e6>m^-3
RenderingHints
ValidMin
0.01
ValidMax
1000.0
FillValue
-1.0E31
Particle
ParticleType
Proton
Qualifier
Moment
Qualifier
Scalar
ParticleQuantity
NumberDensity
Parameter #6
Name
Psw
ParameterKey
SW_Pressure
Description
Ion pressure (assuming protons measured and adding 5% alphas, from SWA), scalar
Caveats
Assuming Vp = Va, P = C * Np * mp * Vp*Vp * [1 + 4(.05)]. mp = 1.67 * 10^(-27), C = 10^(21), Np in #/cc, Vp in km/s. Pressure not provided for density less than 0.3/cc because of the poor counting statistics.
Units
nPa
UnitsConversion
1e-9>Pa
ValidMin
1.0E-4
ValidMax
100.0
FillValue
-1.0E31
Particle
ParticleType
Proton
ParticleType
AlphaParticle
ParticleType
Ion
Qualifier
Scalar
ParticleQuantity
Pressure