APEX-ANTIAPEX ASYMMETRY IN THE ANOMALOUS COSMIC-RAY DISTRIBUTION IN THE HELIOSHEATH

We study the global distribution of low energy anomalous cosmic ray (A CR) protons in the heliosheath within a simplified, axially symmetric model of ACR convective/diffusive transport and loss processes. The AC R diffusion coefficient in the LISM we assume to be significantly larg er than inside the heliopause. We take into account the tenser structu re of the diffusion coefficient, as far as it is permitted by the assu med axial symmetry. The plasma flow we treat as a fixed background des cribed by Parker's (or related) potential solution. In the heliospheri c tail region we include the deviations from incompressible flow (and related upward shift of particles energy) caused by slowing down of th e plasma due to charge-exchange with the neutral H background. The res ults show a pronounced pile-up of the low energy (200 keV-2 MeV) ACR p rotons in the tail region of the heliosphere. This feature could be de tected in the ENA fluxes resulting from transcharging of ACR ions on n eutral galactic H background.