2.7.1 https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available SPASE metadata descriptions spase://NASA/NumericalData/CNOFS/CINDI/IVM/PT0.5S NASA NumericalData CNOFS CINDI IVM 500 ms Ion Drift Data https://doi.org/10.48322/r9x4-x639 2025-12-04T13:29:03Z 2021-04-27T15:38:11 Only known prior ReleaseDate of the metadata 2023-07-30T12:34:56.789 Added DOI and PublicationInfo minted by LFB, metadata versioned up to SPASE 2.6.0, reviewed by LFB 20230727 2025-10-02T15:11:47Z 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 2025-12-04T13:29:03Z Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB 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. Please acknowledge NASA SPDF and the CINDI team at the University of Texas at Dallas that is supported by NASA grant NAS5-01068 Heelis, Roderick, A. 2023-01-01T00:00:00 Space Physics Data Facility spase://SMWG/Person/Roderick.A.Heelis PrincipalInvestigator spase://SMWG/Person/Lee.Frost.Bargatze MetadataContact spase://VSPO/NumericalData/CNOFS/CINDI/IVM/PT0.5S spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb Online Open https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products CDAWeb https://cdaweb.gsfc.nasa.gov/cgi-bin/eval2.cgi?dataset=CNOFS_CINDI_IVM_500MS&index=sp_phys CNOFS_CINDI_IVM_500MS Plots, lists and files from CDAWeb. Text https://cdaweb.gsfc.nasa.gov/pub/data/cnofs/cindi/ivm_500ms_cdf/$Y cnofs_cindi_ivm_500ms_$Y$m$d_$v.cdf the GSFC SPDF Team spase://SMWG/Repository/NASA/GSFC/SPDF Online Open CDAWeb Programmatic Data Access https://cdaweb.gsfc.nasa.gov/WS/cdasr/1/dataviews/sp_phys/datasets/CNOFS_CINDI_IVM_500MS/clientLibraryExample/ CNOFS_CINDI_IVM_500MS Access to this data from common programming environments. Note: this AccessInformation element was added by HDPWS. Binary the GSFC SPDF Team spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb Online Open https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products CDAWeb HAPI Server https://cdaweb.gsfc.nasa.gov/hapi CNOFS_CINDI_IVM_500MS Web Service to this product using the HAPI interface. CSV the GSFC SPDF Team spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb Online Open https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products FTPS from SPDF (not with most browsers) ftps://spdf.gsfc.nasa.gov/pub/data/cnofs/cindi/ivm_500ms_hdf/ In HDF via FTP from SPDF HTTPS from SPDF https://spdf.gsfc.nasa.gov/pub/data/cnofs/cindi/ivm_500ms_hdf/ In HDF via HTTP from SPDF HDF NASA, SPDF, and the CINDI team at the University of Texas at Dallas spase://SMWG/Repository/NASA/GSFC/SPDF/CDAWeb Online Open https://spdx.org/licenses/ SPDX CC0-1.0 https://spdx.org/licenses/CC0-1.0.html Creative Commons Zero v1.0 Universal CC0 1.0 Universal is the Creative Commons license applicable to all publicly available NASA Heliophysics data products CDAWeb Data Repository FTP Interface ftps://cdaweb.gsfc.nasa.gov/pub/data/cnofs/cindi/ HDF CALIBRATED spase://SMWG/Instrument/CNOFS/CINDI/IVM ThermalPlasma 2008-08-01T00:00:00 -P6M Data are presently ~6 months delayed PT0.5S Earth.NearSurface 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.