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/ISEE3/IsotFrac NASA NumericalData ISEE 3 Isotopic Fractions https://doi.org/10.48322/kf5j-wz44 2026-02-18T18:12:08Z 2025-05-15T18:39:11Z Only known prior ReleaseDate of the metadata 2025-11-14T16:02:26Z Added PublicationInfo. Added ResourceType and NamingAuthority. ZCB 2025-12-04T13:29:38Z Added MetadataRightsList and RightsList(s). Updated to 2.7.1. ZCB 2026-02-18T18:12:08Z Added DOI. tlk This data product consists of a single ASCII file containing values and their uncertainties for isotopic fractions of 56 specific isotopes relative to isotope-integrated elemental abundances, for 15 elements (Be, B, N, S, Cl, Ar, K, Ca, Ti, V, Cr, Mn, Fe, Co, Ni). Between this data product and a companion product with isotopic abundance ratios, isotopic composition information is given for 21 chemical elements. The fractions are based on 1978-1981 observations of ~50-500 MeV/n cosmic rays by the U. Chicago cosmic ray experiment on ISEE 3. Each of the ratios is linked in the ASCII file to the publication where its derivation is discussed. Please acknowledge the author(s) of the relevant publication(s) as mentioned above, and acknowledge Mark Wiedenbeck, the ISEE 3 instrument Principal Investigator. Wiedenbeck, Mark E. 2025-11-14T16:02:26Z Space Physics Data Facility spase://SMWG/Person/Mark.E.Wiedenbeck PrincipalInvestigator subdirectory holding ISEE 3 cosmic ray data https://spdf.gsfc.nasa.gov/pub/data/isee/isee3/energetic_particles_cr/cr_composition/ spase://VEPO/NumericalData/ISEE3/IsotFrac spase://VSPO/NumericalData/ISEE3/IsotFrac 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/isee/isee3/energetic_particles_cr/cr_composition/table2.txt HTTPS from SPDF https://spdf.gsfc.nasa.gov/pub/data/isee/isee3/energetic_particles_cr/cr_composition/table2.txt In CDF via HTTP from SPDF Text 3 KB Please acknowledge the author(s) of the relevant publication(s) as mentioned above, and acknowledge Mark Wiedenbeck, the ISEE 3 instrument Principal Investigator. spase://SMWG/Instrument/ISEE3/HECR EnergeticParticles IonComposition 1978-08-18T00:00:00 1981-04-30T00:00:00 This is span of data used in deriving 32-month averaged ratios P32M Heliosphere.NearEarth