  A comparison of the Helium and Carbon interstellar spectra measured at
Voyager in the local interstellar medium leads to a different interpretation
than a comparison of the Hydrogen to Helium spectra. This is because the He/C
ratio is observed to increase rapidly with energy below 40 MeV/nuc in contrast
to an almost constant H/He ratio at these low energies. Both the He and C
spectra that are observed at Voyager above 40 MeV/nuc and much higher energy
spectra from the PAMELA measurements of these two components up to 100 GeV/nuc
can be accurately fit to within 10% assuming galactic propagation in a leaky
box type of diffusion model in the galaxy with identical source spectra P-2.28
for He and C using a diffusion coefficient P0.50 above 1 GV rigidity. These
same exponents also fit the H spectrum from 40 MeV to over 100 GeV. At low
energies an excess of He relative to C is observed that would amount to about
20% of the modeled galactic component at 10 MeV/nuc.
