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Data Access
Binary
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.
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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Details
Version:2.7.1
NumericalData
ResourceID
spase://NASA/NumericalData/GEO-Reanalysis/OBrienLemon/PT1H
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
O'Brien-Lemon Magnetospheric Density Reanalysis Data Set
ReleaseDate
2025-12-04 13:29:17Z
RevisionHistory
RevisionEvent
ReleaseDate
2020-07-07 21:14:34Z
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2025-12-04 13:29:17Z
Note
Added MetadataRightsList. Added ResourceType and NamingAuthority. Updated to 2.7.1. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. ZCB
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
Role
Person
StartDate
StopDate
Note
1.
GeneralContact
spase://SMWG/Person/T.Paul.OBrien
2.
GeneralContact
spase://SMWG/Person/Colby.L.Lemon
InformationURL
Name
ViRBO web page for this dataset
URL
http://virbo.org/OBrienLemon/reanalysis/
Description
Top-level web page for data set
InformationURL
Name
Description of the dataset
URL
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2006SW000279
Description
Reanalysis of plasma measurements at geosynchronous orbit article
InformationURL
Name
Read Me page at ViRBO
URL
http://mag.gmu.edu/ftp/users/obrien/reanalysis/README
Description
Read Me text file
PriorIDs
spase://ViRBO/NumericalData/OBrienLemon/PT1H
spase://VSPO/NumericalData/GEO-Reanalysis/OBrienLemon/PT1H
AccessInformation
RepositoryID
spase://SMWG/Repository/ViRBO
Availability
Online
AccessRights
Open
AccessURL
URL
http://mag.gmu.edu/ftp/users/obrien/reanalysis/
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