Abstract
A brief review is given of past attempts to determine the role of global merged interaction regions in the 11-year cosmic-ray modulation cycle with heliospheric cosmic-ray transport models. Two classes of models are discussed, namely spherically-symmetric diffusion, and axi-symmetric drift dominated models. This is followed by a discussion of current work which, differently from previous work, simulated the spatial evolution of global merged interaction regions, including their interaction with the heliospheric termination shock. It is explained how this advance may affect our understanding of the contribution of global merged interaction regions to the cosmic-ray modulation cycle, and lead to a possible test of estimating the termination shock position from spacecraft observations of cosmic rays.
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