Version:2.3.0
NumericalData
ResourceID
spase://JAXA/NumericalData/Geotail/CPI/HPA/PT64S
ResourceHeader
ResourceName
Geotail CPI Hot Plasma Moments
AlternateName
Geotail CPI HPA High Time Resolution Plasma Moments
ReleaseDate
2021-04-27 17:52:35Z
Description
The CPI/HPA Hot Plasma Analyzer high time resolution moments of hot plasma:
* Ion number density
* Ion average temperature
* Ion bulk flow velocity
* Electron number density
* Electron average temperature
The CPI/HPA data are good in the magnetosphere 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_HPA_PT64S
spase://VMO/NumericalData/Geotail/CPI/HPA_PT64S
spase://VSPO/NumericalData/Geotail/CPI/HPA/PT64S
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_HPAMOM_CPI
Format
CDF
Encoding
None
AccessDirectoryTemplate
https://cdaweb.gsfc.nasa.gov/pub/data/geotail/cpi/cpi_hpamom/$Y
AccessFilenameTemplate
ge_HPAmom_cpi_$Y$m$d_$v.cdf
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb Programmatic Data Access
URL
Style
WebService
ProductKey
GE_HPAMOM_CPI
Description
Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS.
Format
Binary
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Name
CDAWeb HAPI Server
URL
Style
HAPI
ProductKey
GE_HPAMOM_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 HPA high time resolution data
URL
Format
Text
Encoding
ASCII
InstrumentIDs
MeasurementType
ThermalPlasma
TemporalDescription
TimeSpan
StartDate
1992-10-06 00:00:28
RelativeStopDate
-P2Y
Cadence
PT64S
ObservedRegion
Earth.Magnetosheath
ObservedRegion
Earth.Magnetosphere
ObservedRegion
Earth.Magnetosphere.Magnetotail
Caveats
The electron sensors for the CPI HP analyzer require regular intercalibration. Also, their sensitivity declined over time. A detrending factor is applied so that average electron densities are consistent with ion densities. The HP ion data and the electron data are good through a the end of 2005. The sensitivity decline had been linear until the end of 2005, but hasn't been checked for 2006 or 2007. That may affect the HP electron parameters for 2006 and 2007, but not the HP ion parameters.
In June of 2007, the HP sensor bias voltage was raised to improve the electron gain, which over the course of 15 years had dropped by about half. This requires recalibration of both the HP ion sensors and the HP electron sensors.
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
Ni
ParameterKey
Density_i
Description
Ion number density (Hot Plasma Analyzer), scalar
Caveats
The ions are assumed to be protons
Units
cm^-3
UnitsConversion
1e6>m^-3
RenderingHints
ValidMin
0.01
ValidMax
1000.0
FillValue
-1.0E31
Particle
ParticleType
Proton
ParticleType
AlphaParticle
ParticleType
Ion
Qualifier
Moment
Qualifier
Scalar
ParticleQuantity
NumberDensity
Parameter #3
Name
Ti
ParameterKey
Temp_i
Description
Kinetic temperature of HPA ions, scalar
Caveats
Calculated by integrating the distribution function
Units
Component.K
RenderingHints
ValidMin
10000.0
ValidMax
5.0E8
FillValue
-1.0E31
Particle
ParticleType
Proton
ParticleType
AlphaParticle
ParticleType
Ion
Qualifier
Moment
Qualifier
Scalar
ParticleQuantity
Temperature
Parameter #4
Name
Vi
ParameterKey
Velocity_i
Description
Ion bulk flow velocity vector in GSE coordinates
Units
km/s
UnitsConversion
1e3>m/s
CoordinateSystem
CoordinateRepresentation
Cartesian
CoordinateSystemName
GSE
RenderingHints
Structure
Size
3
Element
Name
Vx GSE
Qualifier
Component.I
Index
1
ValidMin
-1400.0
ValidMax
1400.0
FillValue
-1.0E31
Element
Name
Vy GSE
Qualifier
Component.J
Index
2
ValidMin
-1400.0
ValidMax
1400.0
FillValue
-1.0E31
Element
Name
Vz GSE
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 #5
Name
Ne
ParameterKey
Density_e
Description
Electron number density (Hot Plasma Analyzer), scalar
Units
cm^-3
UnitsConversion
1e6>m^-3
RenderingHints
ValidMin
0.01
ValidMax
1000.0
FillValue
-1.0E31
Particle
ParticleType
Electron
Qualifier
Moment
Qualifier
Scalar
ParticleQuantity
NumberDensity
Parameter #6
Name
Te
ParameterKey
Temp_e
Description
Kinetic temperature of HPA electrons, scalar
Caveats
Calculated by integrating the distribution function
Units
Component.K
RenderingHints
ValidMin
10000.0
ValidMax
5.0E8
FillValue
-1.0E31
Particle
ParticleType
Electron
Qualifier
Moment
Qualifier
Scalar
ParticleQuantity
Temperature
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