Abstract
We present an overview of the "dominant turbulence" picture of pickup proton isotropization and its recent application to the spatial retention of these particles in the nearby interstellar medium as an explanation for the IBEX ribbon structure. We report the progress of further modeling in this area, expanding the published model to 3D and adding a contribution of energetic neutral atoms from the inner heliosheath to the ribbon volume. We find that the ribbon flux expected at IBEX from this model is still below the observed value, but the discrepancy is much smaller than that of our previous result.
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