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At the Voyager 1 spacecraft in the outer heliosphere, after a series ofcomplex intensity changes starting at about May 8th, the intensities of bothanomalous cosmic rays (ACR) and galactic cosmic rays (GCR) changed suddenly anddecisively on August 25th (121.7 AU from the Sun). The ACR started theintensity decrease with an initial e-folding rate of intensity decrease of ~1day. Within a matter of a few days, the intensity of 1.9-2.7 MeV protons andhelium nuclei had decreased to less than 0.1 of their previous value and aftera few weeks, corresponding to the outward movement of V1 by ~0.1 AU, theseintensities had decreased by factors of at least 300-500 and are now lower thanmost estimates of the GCR spectrum for these lower energies and also at higherenergies. The decrease was accompanied by large rigidity dependent anisotropiesin addition to the extraordinary rapidity of the intensity changes. Also onAugust 25th the GCR protons, helium and heavier nuclei as well as electronsincreased suddenly with the intensities of electrons reaching levels ~30-50%higher than observed just one day earlier. This increase for GCR occurred over~1 day for the lowest rigidity electrons, and several days for the higherrigidity nuclei of rigidity ~0.5-1.0 GV. After reaching these higher levels theintensities of the GCR of all energies from 2 to 400 MeV have remainedessentially constant with intensity levels and spectra that may represent thelocal GCR. These intensity changes will be presented in more detail in this,and future articles, as this story unfolds.

At Voyager 1 Starting on about August 25, 2012 at a Distance of 121.7 AU  From the Sun, a Sudden Disappearance of Anomalous Cosmic Rays and an  Unusually Large Sudden Increase of Galactic Cosmic Ray H and He Nuclei and  Electron Occurred