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Studies on Voyager 1 using the CRS instrument have shown the presence ofsub-MeV electrons in the interstellar medium beyond the heliopause. We believethat these electrons are the very low energy tail of the distribution ofgalactic GeV cosmic ray electrons produced in the galaxy. If so thisobservation places constraints on the origin and possible source distributionof these electrons in the galaxy. The intensities of these electrons as well asMeV protons and other higher energy electrons and nuclei have been followedoutward from the Earth to beyond the heliopause during the 40 years of theVoyager mission. Among the other new features found in this study of the radialdependence of the electron intensity in the heliosphere are: 1. The heliosheathis a source of sub-MeV electrons as well as the already known anomalous cosmicrays of MeV and above, none of which appear to escape from the heliospherebecause of an almost impenetrable heliopause at these lower energies; 2. Solarmodulation effects are observed for these MeV electrons throughout theheliosphere. These modulation effects are particularly strong for electrons inthe heliosheath and comprise over 90 percent of the observed intensity changeof these electrons of 10-60 MeV between the Earth and the heliopause. Even fornuclei of 1 GV in rigidity, over 30 percent of the total intensity differencebetween the Earth and the LIM occurs in the heliosheath; 3. The 2 MeV protonsstudied here for the first time beyond the heliopause are also part of the lowenergy tail of the spectrum of galactic cosmic ray protons, similar to the tailnoted above for sub MeV galactic cosmic ray electrons.

Cosmic Ray Electrons and Protons ~1 MeV - A 40 Year Study of Their  Intensities from the Earth to the Heliopause and Beyond Into Local  Interstellar Space by the CRS Experiment on Voyager 1