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/DE2/RPA/PT2S NASA NumericalData DE 2 2s Retarding Potential Analyzer (RPA) Ion Plasma Parameters Dynamics Explorer 2 RPA Ion Plasma DE-B RPA Ion Plasma https://doi.org/10.48322/41b3-kz41 2025-12-04T13:29:08Z 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 2025-10-02T15:11:48Z 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 2025-12-04T13:29:08Z Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB This data set contains the following plasma parameters at 16ms resolution from the DE 2 Retarding Potential Analyzer: ion drift velocity, ion temperature, densities of all ions and of O+, H+, He+, molecular, and high mass ions. Data are available in ASCII from nssdcftp and in CDF format from CDAWeb (as well as CDAWeb plots and lists). The data span the 18-month DE 2 lifetime, except for a gap from 1981/317 to 1982/041. Please acknowledge the RPA Principal Investigators, Drs. W.B. Hanson (original P.I.) and R.A. Heelis Heelis, Roderick, A.; Hanson, William, B.; Candey, Robert, M. 2023-01-01T00:00:00 Space Physics Data Facility; University of California, Los Angeles spase://SMWG/Person/Roderick.A.Heelis PrincipalInvestigator spase://SMWG/Person/William.B.Hanson PrincipalInvestigator spase://SMWG/Person/James.M.Weygand MetadataContact spase://SMWG/Person/Robert.M.Candey GeneralContact spase://SMWG/Person/Lee.Frost.Bargatze MetadataContact Readme file at SPDF https://spdf.gsfc.nasa.gov/pub/data/de/de2/plasma_rpa/00readme.txt NSSDC's Master Catalog on the Retarding Potential Analyzer (RPA) https://nssdc.gsfc.nasa.gov/nmc/experiment/display.action?id=1981-070B-07 The Retarding Potential Analyzer (RPA) measured the bulk ion velocity in the direction of the spacecraft motion, the constituent ion concentrations, and the ion temperature along the satellite path. These parameters were derived from a least squares fit to the ion number flux vs energy curve obtained by sweeping or stepping the voltage applied to the internal retarding grids of the RPA. In addition, a separate wide aperture sensor, a duct sensor, was flown to measure the spectral characteristics of iregularities in the total ion concentration. The measured parameters obtained from this investigation were important to the understanding of mechanisms that influence the plasma; i.e., to understand the coupling between the solar wind and the earth's atmosphere. The measurements were made with a multigridded planar retarding potential analyzer very similar in concept and geometry to the instruments carried on the AE satellites. The retarding potential was variable in the range from approximately +32 to 0 volts. The details of this voltage trace, and whether it was continuous or stepped, depended on the operating mode of the instrument. Specific parameters deduced from these measurements were ion temperature; vehicle potential; ram component of the ion drift velocity; the ion and electron concentration irregularity spectrum; and the concentration of H+, He+, O+, and Fe+, and of molecular ions near perigee. Additional details are in W. B. Hanson et al., Space Sci. Instrum., v. 5, n. 4, p. 503, 1981. spase://VMO/NumericalData/DE2/VEFI/Ni.Vi.Ti/PT2S spase://VSPO/NumericalData/DE2/RPA/PT2S 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/de/de2/plasma_rpa/ For ftp retrieval of daily CDF files HTTPS from SPDF https://spdf.gsfc.nasa.gov/pub/data/de/de2/plasma_rpa/ In CDF via HTTP from CDAWeb CDF 300 KB P1D Please acknowledge the RPA Principal Investigators, Drs. W.B. Hanson (original P.I.) and R.A. Heelis and the Space Physics Data Facility at NASA/GSFC 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=DE2_ION2S_RPA&index=sp_phys DE2_ION2S_RPA For CDAWeb subset, plot and list capabilities Text 100 KB PT1H Please acknowledge the RPA Principal Investigators, Drs. W.B. Hanson (original P.I.) and R.A. Heelis and the Space Physics Data Facility at NASA/GSFC 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 DE2_ION2S_RPA Web Service to this product using the HAPI interface. CSV Please acknowledge the RPA Principal Investigators, Drs. W.B. Hanson (original P.I.) and R.A. Heelis and the Space Physics Data Facility at NASA/GSFC spase://SMWG/Repository/UCLA/DE2 Online Open VMO UCLA http://vmo.igpp.ucla.edu/data1/DE2/RPA/ni_Ti_vi_2s_ascii/ Dynamics Explorer 2 Retarding Potential Analyzer 2 s data Text ASCII NASA; William B. Hanson; VMO Calibrated spase://SMWG/Instrument/DynamicsExplorer2/RPA ThermalPlasma 1981-08-06T00:00:00 1983-02-16T00:00:00 PT2S Earth.NearSurface.Ionosphere