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/IMP8/CRNC/Helium_PT1H NASA NumericalData IMP 8 Cosmic Ray Nuclear Composition (CRNC) hourly energetic alpha particle fluxes https://doi.org/10.48322/n8h3-d525 2025-12-04T13:29:34Z 2021-03-11T18:39:11Z Only known prior ReleaseDate of the metadata 2025-11-14T16:02:24Z Added PublicationInfo. 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 2025-12-04T13:29:34Z Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB This data set contains hourly, spin-averaged fluxes of alpha particles from the IMP8 Cosmic Ray Nuclear Composition experiment of U. Chicago and UNH. There are fluxes of alpha particles in 9 energy bins from 10.90-12.89 to 84.32-94.81 MeV/n. These fluxes were generated at GSFC/SPDF from count rates accessible from UNH. Acknowledge the late John A. Simpson, the original CRNC PI, and Clifford Lopate/UNH, current PI. Lopate, Clifford 2025-11-14T16:02:24Z Space Physics Data Facility spase://SMWG/Person/Clifford.Lopate PrincipalInvestigator Readme file at SPDF https://spdf.gsfc.nasa.gov/pub/data/imp/imp8/particles_uchi/hourly/alphas/aareadme.txt Comprehensive data descriptive file https://spdf.gsfc.nasa.gov/pub/data/imp/imp8/particles_uchi/15min_asci/voldesc.sfd SFDU-formatted file describing the CRNC instrument and the 15-min data set of count rates and pulse height data from which the hourly rates data set was created. Division of hourly rates by geometric factor and energy band widths yielded the hourly fluxes. spase://VEPO/NumericalData/IMP8/CRNC/Helium_PT1H spase://VSPO/NumericalData/IMP8/CRNC/Helium_PT1H spase://SMWG/Repository/NASA/GSFC/SPDF 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/imp/imp8/particles_uchi/hourly/alphas/ ftp access to alpha particle-specific subdirectory holding annual ASCII files HTTPS from SPDF https://spdf.gsfc.nasa.gov/pub/data/imp/imp8/particles_uchi/hourly/alphas/ In CDF via HTTP from SPDF FTPBrowser https://omniweb.gsfc.nasa.gov/ftpbrowser/imp_chi_crnc_1h.html Subset, plot and list fluxes of protons, alpha particles and electron, and count rates of heavies, via FTPBrowser Multi-Source Spectral Plot https://omniweb.gsfc.nasa.gov/ftpbrowser/flux_spectr_m.html Spectral plots and power law fits for arbitrary durations Text 1 MB P1Y Acknowledge C. Lopate, J. Simpson, and GSFC/SPDF (Space Physics Data Facility) spase://SMWG/Instrument/IMP8/CRNC EnergeticParticles 1973-10-30T00:00:00 2001-10-26T00:00:00 PT1H Heliosphere.NearEarth Time Column_1-Column_3 Time at start of flux average, as year, day, hour PT1H 3 year, day, hour Temporal Fractional Coverage Column_4 Fractional counting coverage (0-1) during this hour PT1H Temporal Alpha particle fluxes Column_5-Column_13 Spin-integrated fluxes of alpha particles, at 1-hour resolution, in nine energy bins: 10.90-12.89, 12.89-16.35, 16.35-19.95, 19.95-25.36, 30.61-42.03, 42.03-55.40, 55.40-69.64, 69.64-84.32, 84.32-94.81 MeV/n PT1H 1/sec-cm**2-ster-MeV/n 9 Array of fluxes at 9 energy windows AlphaParticle NumberFlux 2 10.90 94.81 MeV/n