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A comparison of the Helium and Carbon interstellar spectra measured atVoyager in the local interstellar medium leads to a different interpretationthan a comparison of the Hydrogen to Helium spectra. This is because the He/Cratio is observed to increase rapidly with energy below 40 MeV/nuc in contrastto an almost constant H/He ratio at these low energies. Both the He and Cspectra that are observed at Voyager above 40 MeV/nuc and much higher energyspectra from the PAMELA measurements of these two components up to 100 GeV/nuccan be accurately fit to within 10% assuming galactic propagation in a leakybox type of diffusion model in the galaxy with identical source spectra P-2.28for He and C using a diffusion coefficient P0.50 above 1 GV rigidity. Thesesame exponents also fit the H spectrum from 40 MeV to over 100 GeV. At lowenergies an excess of He relative to C is observed that would amount to about20% of the modeled galactic component at 10 MeV/nuc.

The Cosmic Ray Helium and Carbon Nuclei Spectra Measured by Voyager 1 at  Low Energies and Earth Based Measurements of these Nuclei up to 200 GeV nuc  Concordance at High Energies with a Leaky Box Propagation Model