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O'Brien-Lemon Magnetospheric Density Reanalysis Data Set

ResourceID
spase://NASA/NumericalData/GEO-Reanalysis/OBrienLemon/PT1H

Description

Retrospective analyses of spacecraft anomalies, especially surface charging, require information about the local plasma environment. Such information is usually not available at geosynchronous orbit because most vehicles lack appropriate sensors. We have constructed a nearly continuous hourly database covering four plasma moments at geosynchronous orbit: density and temperature for hot (energies > 100 eV) protons and electrons. The four moments are provided for 24 hourly fiducial local time bins and cover the years 1990-2005. We apply an ensemble of simple models to fill in the local time gaps between plasma measurements at geosynchronous orbit made by Los Alamos sensors. Validation on artificial data gaps shows that the reconstruction has rank order correlations ranging from 0.65 to 0.97, depending on bulk moment and local time. As a demonstration, we include a comparison of our reanalysis electron temperature to on-orbit surface charging measurements at a vehicle that lacks a plasma sensor. In addition to anomaly analyses, the reanalysis database we have produced can be used to provide geosynchronous boundary conditions for numerical simulations of the inner magnetosphere and temporal variations at a single location for statistical studies.

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Details

Version:2.2.9

NumericalData

ResourceID
spase://NASA/NumericalData/GEO-Reanalysis/OBrienLemon/PT1H
ResourceHeader
ResourceName
O'Brien-Lemon Magnetospheric Density Reanalysis Data Set
ReleaseDate
2020-07-07 21:14:34Z
Description

Retrospective analyses of spacecraft anomalies, especially surface charging, require information about the local plasma environment. Such information is usually not available at geosynchronous orbit because most vehicles lack appropriate sensors. We have constructed a nearly continuous hourly database covering four plasma moments at geosynchronous orbit: density and temperature for hot (energies > 100 eV) protons and electrons. The four moments are provided for 24 hourly fiducial local time bins and cover the years 1990-2005. We apply an ensemble of simple models to fill in the local time gaps between plasma measurements at geosynchronous orbit made by Los Alamos sensors. Validation on artificial data gaps shows that the reconstruction has rank order correlations ranging from 0.65 to 0.97, depending on bulk moment and local time. As a demonstration, we include a comparison of our reanalysis electron temperature to on-orbit surface charging measurements at a vehicle that lacks a plasma sensor. In addition to anomaly analyses, the reanalysis database we have produced can be used to provide geosynchronous boundary conditions for numerical simulations of the inner magnetosphere and temporal variations at a single location for statistical studies.

Contacts
RolePerson
1.GeneralContactspase://SMWG/Person/T.Paul.OBrien
2.GeneralContactspase://SMWG/Person/Colby.L.Lemon
InformationURL
Name
ViRBO web page for this dataset
URL
Description

Top-level web page for data set

InformationURL
Name
Description of the dataset
URL
Description

Reanalysis of plasma measurements at geosynchronous orbit article

InformationURL
Name
Read Me page at ViRBO
URL
Description

Read Me text file

PriorIDs
spase://ViRBO/NumericalData/OBrienLemon/PT1H
spase://VSPO/NumericalData/GEO-Reanalysis/OBrienLemon/PT1H
AccessInformation
RepositoryID
Availability
Online
AccessRights
Open
AccessURL
Format
Binary
Encoding
None
MeasurementType
EnergeticParticles
TemporalDescription
TimeSpan
StartDate
1989-09-14 00:00:00.00000
StopDate
2005-09-24 23:00:00.00000
Cadence
PT1H
ObservedRegion
Earth.NearSurface
Parameter #1
Name
denhp
ParameterKey
denhp
Description

Density of hot protons

Units
#/cm^3
Mixed
MixedQuantity
Other
Parameter #2
Name
denhe
ParameterKey
denhe
Description

Density of hot electrons

Units
#/cm^3
Mixed
MixedQuantity
Other
Parameter #3
Name
thp
ParameterKey
thp
Description

Temperature of hot protons

Units
eV
Mixed
MixedQuantity
Other
Parameter #4
Name
the
ParameterKey
the
Description

Temperature of hot electrons

Units
eV
Mixed
MixedQuantity
Other