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With the cosmic ray observations made by the Voyager 1 spacecraft outside thedominant modulating influence of the heliosphere, the comparison of computedgalactic spectra with experimental data at lower energies is finally possible.Spectra for specifically protons, Helium and Carbon nuclei, computed bygalactic propagation models, can now be compared with observations at lowenergies from Voyager 1 and at high energies from the PAMELA space detector atEarth. We set out to reproduce the Voyager 1 observations in the energy rangeof 6 MeV/nuc to 60 MeV/nuc, and the PAMELA spectrum above 50 GeV/nuc, using theGALPROP code, similarly to our previous study for Voyager 1 electrons. Byvarying the galactic diffusion parameters in the GALPROP plain diffusion model,specifically the rigidity dependence of spatial diffusion, and then includingreacceleration, we compute spectra simultaneously for galactic protons, Heliumand Carbon.We present new local interstellar spectra, with expressions for theenergy range of 3 MeV/nuc to 100 GeV/nuc, which should be of value for solarmodulation modeling.

New local interstellar spectra for protons, Helium and Carbon derived from PAMELA and Voyager 1 observations