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Voyager 1 data from beyond the heliopause provide the first directmeasurements of the interstellar cosmic ray spectra below 1 GeVnuc. In thispaper we combine these Voyager measurements of H and He nuclei from 3-600MeVnuc with higher energy measurements at 1 AU from the BESS and PAMELAexperiments up to 100 GeVnuc. Using a Weighted Leaky Box Model for propagationin the galaxy, we obtain an excellent fit to these new Voyager observations andthe much higher energy spectra up to 100 GeVnuc by using source spectra whichare P-2.28, with the exponent independent of rigidity from low to highrigidities; along with a rigidity dependence of the diffusion path length whichis P-0.5 at rigidities 1.00 GV, and possibly changing to P1.0 at lowerrigidities.

A Fit to the Galactic Cosmic Ray Hydrogen and Helium Spectra at Voyager  1 at Low Energies and Earth Based Measurements at Much Higher Energies with  Identical Rigidity Independent Source Spectra for the Hydrogen and Helium  Nuclei