Unusual Energetic Particle Behavior in the Depletion Region at > 121 AU observed with LECP on Voyager 1

An outstanding feature of energetic particle observations just before and after crossing into the recently identified "depletion region" at 122 AU has been the organization of the data by pitch angle, revealed by LECP's 360° rotation scheme and the MAG magnetic field direction measurements. Immediately beyond the "heliocliff", the anomalous cosmic ray (ACR) protons at ~3 Mev exhibit faster decay rates along the magnetic field than perpendicular to it. At all distances beyond the heliocliff, galactic cosmic rays (GCR) display general isotropy in all but the direction nearly perpendicular to the magnetic field. There is a general and continuing decay in intensities of GCRs at 90° pitch angles, with occasional, time-ordered disruptions, indicative of continuing heliospheric control in this region. In early June, 2013, there was an onset of relativistic electron burst activity with FWHM as small as ~ 6 hours that persisted for ~ 20 days. These electrons appeared ~ 1 month after an outburst of X-class solar flares, suggesting a possible solar origin and hence magnetic connection back to the Sun. In contrast to the GCRs, the electon intensities were essentially isotropic, based on three-day averages. Ion activity in the depletion region is detected above background only in the lowest energy PHA proton channels (E ~ 400 keV). Over the past few months there has been an increase of well over an order of magnitude at these energies, but no change at > 1 Mev. Nor have the heavier species (He, C, O) increased at any energy. It would appear that ACRs are totally absent from the depletion region to this date.