Voyager 1 UVS measurements of Galactic cosmic rays

Detectors of the Ultra-Violet Spectrographs (UVS) on board the Voyagers provide independent measurements of galactic cosmic ray (GCR) fluxes. The energy and angular response are derived from correlative studies with other Voyager Instruments. We show the evolution of the GCR flux and anisotropy during and after the abrupt increases in 2012. Using data from UVS and other instruments we show strong evidence for the end of the GCR heliospheric modulation in the 300 MeV range at the present location of Voyager 1, in line with the flux steadiness since September 2012. This suggests that Voyager already entered the interstellar medium, and we discuss potential reasons.