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We have determined the solar modulation potential, phi, vs. time that isobserved at Voyager 1 and 2 from measurements of the H and He nucleiintensities at a common energy of 250 MeVnuc. The H nuclei have a rigidity 0.7GV, the He nuclei 1.4 GV. These measurements cover a 40 year time period, whichincludes almost 4 cycles of solar 11 year sunspot variations, throughout theinner heliosphere out to the HTS at distances of 95 AU and 85 AU, respectivelyat V1 and V2, and then beyond in the heliosheath. Inside the HTS the modulationpotential vs. time curves at V1 and V2 show a very similar temporal structureto those observed at the Earth. During a later period of maximum solarmodulation from 2000.0 to 2005.0 when V1 and V2 are in the outer heliospherebetween 60-94 AU, the main temporal features of the modulation potential curvesat all 3 locations match up with appropriate time delays at V1 and V2 if it isassumed that spatially coherent structures are moving outward past V1 and V2,with outward speeds of up to 700 Kms negative 1. After 2004.0 V1 and V2 are atlatitudes of positive 35 and negative 30 respectively, placing lower limits onthe latitude extent of these structures. Beyond the HTS in the heliosheath themodulation potential slowly decreases at both spacecraft with only a weakevidence of the unusual modulation minimum observed at the Earth in 2009, forexample. A sudden decrease of the modulation potential 50 MV for both H and Henuclei occurs at V1 just before the heliopause crossing at about 122 AU. Thisdecrease has not yet been observed at V2, which is now at 113 AU and stillobserving a modulation potential 60 MV.

The Intensities of Cosmic Ray H and He Nuclei at ~250 MeV/nuc Measured  by Voyagers 1 and 2 - Using these Intensities to Determine the Solar  Modulation Parameter in the Inner Heliosphere and the Heliosheath Over a 40  Year Time Period