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Data Access
CDAWeb
WebService:
CDAWeb Programmatic Data Access
HAPI: CDAWeb HAPI Server
FTPS from SPDF (not with most browsers)
HTTPS from SPDF
CDAWeb Data Repository FTP Interface
CNOFS CINDI IVM 500 ms Ion Drift Data
var authors='Heelis, Roderick, A.';
document.write(authors);
(2023).
CNOFS CINDI IVM 500 ms Ion Drift Data.
[Data set].
Space Physics Data Facility.
https://doi.org/10.48322/r9x4-x639. Accessed on document.write(currentDateStr);.
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ResourceID
spase://NASA/NumericalData/CNOFS/CINDI/IVM/PT0.5S
Description
This data set contains plasma parameters of the equatorial F-region in the ionosphere measured by the Ion Velocity Meter (IVM) of the Coupled Ion-Neutral Dynamics Investigation (CINDI) payload on board the CNOFS spacecraft. Data are available in HDF format, with an IDL program to read and plot them. Each file contains data from one day of spacecraft operation and the file contains eight primary geophysical parameters: the ion temperature (Ti) in degrees Kelvin, the ion flow in m/s in the ram (i.e.--spacecraft velocity) direction (+Vx in the direction of spacecraft velocity), the ion flows in m/s in the horizontal and vertical directions (Vy and Vz) at right angles to the ram direction (+Vz is downward, +Vy is roughly southward), the total ion density (Ni) (the sum of O+ and H+ and He+ concentrations) in ions/cc, and the individual H+, He+, and O+ concentrations in ions/cc. In addition, ion velocities also are given in the coordinate system of the local magnetic field (parallel, perpendicular, and meridional) in the plots and as ASCII data on the UT Dallas website. Based on the IGRF model, the data are transformed into magnetic coordinates only if all three ion velocities in the spacecraft coordinates are available and good.
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/CNOFS/CINDI/IVM/PT0.5S
NamingAuthority
NASA
ResourceType
NumericalData
ResourceHeader
ResourceName
CNOFS CINDI IVM 500 ms Ion Drift Data
DOI
https://doi.org/10.48322/r9x4-x639
ReleaseDate
2026-06-26 13:16:26Z
RevisionHistory
RevisionEvent
ReleaseDate
2021-04-27 15:38:11Z
Note
Only known prior ReleaseDate of the metadata
RevisionEvent
ReleaseDate
2023-07-30 12:34:56.789Z
Note
Added DOI and PublicationInfo minted by LFB, metadata versioned up to SPASE 2.6.0, reviewed by LFB 20230727
RevisionEvent
ReleaseDate
2025-10-02 15:11:47Z
Note
Updated PublishedBy name to match ROR Registry. Added ResourceType and NamingAuthority. Changed http to https in top-level schemaLocation attribute. Fixed version number separator in top-level schemaLocation attribute. Matched version number in schemaLocation attribute to updated value in Version tag. ZCB
RevisionEvent
ReleaseDate
2025-12-04 13:29:03Z
Note
Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB
RevisionEvent
ReleaseDate
2026-06-26 13:16:26Z
Note
Add 'Z' to RevisionEvent:ReleaseDate(s), PublicationDate, TemporalDescription:TimeSpan:StartDate. ZCB
Description
This data set contains plasma parameters of the equatorial F-region in the ionosphere measured by the Ion Velocity Meter (IVM) of the Coupled Ion-Neutral Dynamics Investigation (CINDI) payload on board the CNOFS spacecraft. Data are available in HDF format, with an IDL program to read and plot them. Each file contains data from one day of spacecraft operation and the file contains eight primary geophysical parameters: the ion temperature (Ti) in degrees Kelvin, the ion flow in m/s in the ram (i.e.--spacecraft velocity) direction (+Vx in the direction of spacecraft velocity), the ion flows in m/s in the horizontal and vertical directions (Vy and Vz) at right angles to the ram direction (+Vz is downward, +Vy is roughly southward), the total ion density (Ni) (the sum of O+ and H+ and He+ concentrations) in ions/cc, and the individual H+, He+, and O+ concentrations in ions/cc. In addition, ion velocities also are given in the coordinate system of the local magnetic field (parallel, perpendicular, and meridional) in the plots and as ASCII data on the UT Dallas website. Based on the IGRF model, the data are transformed into magnetic coordinates only if all three ion velocities in the spacecraft coordinates are available and good.
Acknowledgement
Please acknowledge NASA SPDF and the CINDI team at the University of Texas at Dallas that is supported by NASA grant NAS5-01068
PublicationInfo
Authors
Heelis, Roderick, A.
PublicationDate
2023-01-01 00:00:00Z
PublishedBy
Space Physics Data Facility
Contacts
Role
Person
StartDate
StopDate
Note
1.
PrincipalInvestigator
spase://SMWG/Person/Roderick.A.Heelis
2.
MetadataContact
spase://SMWG/Person/Lee.Frost.Bargatze
PriorIDs
spase://VSPO/NumericalData/CNOFS/CINDI/IVM/PT0.5S
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb
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
CDAWeb
URL
https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=CNOFS_CINDI_IVM_500MS&index=sp_phys
ProductKey
CNOFS_CINDI_IVM_500MS
Description
Plots, lists and files from CDAWeb.
Format
Text
AccessDirectoryTemplate
https://cdaweb.gsfc.nasa.gov/pub/data/cnofs/cindi/ivm_500ms_cdf/$Y
AccessFilenameTemplate
cnofs_cindi_ivm_500ms_$Y$m$d_$v.cdf
Acknowledgement
the GSFC SPDF Team
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/CNOFS_CINDI_IVM_500MS/clientLibraryExample/
Style
WebService
ProductKey
CNOFS_CINDI_IVM_500MS
Description
Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS.
Format
Binary
Acknowledgement
the GSFC SPDF Team
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb
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
CDAWeb HAPI Server
URL
https://cdaweb.gsfc.nasa.gov/hapi
Style
HAPI
ProductKey
CNOFS_CINDI_IVM_500MS
Description
Web Service to this product using the HAPI interface.
Format
CSV
Acknowledgement
the GSFC SPDF Team
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb
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
FTPS from SPDF (not with most browsers)
URL
ftps://spdf.gsfc.nasa.gov/pub/data/cnofs/cindi/ivm_500ms_hdf/
Description
In HDF via FTP from SPDF
AccessURL
Name
HTTPS from SPDF
URL
https://spdf.gsfc.nasa.gov/pub/data/cnofs/cindi/ivm_500ms_hdf/
Description
In HDF via HTTP from SPDF
Format
HDF
Acknowledgement
NASA, SPDF, and the CINDI team at the University of Texas at Dallas
AccessInformation
RepositoryID
spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb
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
CDAWeb Data Repository FTP Interface
URL
ftps://cdaweb.gsfc.nasa.gov/pub/data/cnofs/cindi/
Format
HDF
ProviderProcessingLevel
CALIBRATED
InstrumentIDs
spase://SMWG/Instrument/CNOFS/CINDI/IVM
MeasurementType
ThermalPlasma
TemporalDescription
TimeSpan
StartDate
2008-08-01 00:00:00Z
RelativeStopDate
-P6M
Note
Data are presently ~6 months delayed
Cadence
PT0.5S
ObservedRegion
Earth.NearSurface
Caveats
In general the ion temperature and densities can be trusted to be valid throughout the entire orbit and at all altitudes. However the flow data can only be trusted at lower altitudes. The analysis of the ram velocity becomes more uncertain as the percentage of the light ions becomes predominate. Under those conditions, the analysis routine sets Vx to zero and solves for the other parameters. Note that the Vy or Vz data are also removed here since the drift meter does not produce usable data under these conditions. Likewise the crosstrack ion drift meter only works reliably when the percentage of O+ is very high and since the percentage of O+ decreases with increasing altitude, therefore the best crosstrack data come in the region near perigee and on the dayside. However, data from perigee on the nightside or near apogee on the dayside can also be acceptable, depending on the ambient O+ densities. Be certain to read the CINDI Quality Flag Description document and check the individual RPA and DM quality flags for each record before using the data. Also, please do not use these data in a presentation or publication without first checking with one of the CINDI researchers.