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During the solar journey through galactic space, variations in the physicalproperties of the surrounding interstellar medium (ISM) modify the heliosphereand modulate the flux of galactic cosmic rays (GCR) at the surface of theEarth, with consequences for the terrestrial record of cosmogenicradionuclides. One phenomenon that needs studying is the effect on cosmogenicisotope production of changing anomalous cosmic ray fluxes at Earth due tovariable interstellar ionizations. The possible range of interstellar rampressures and ionization levels in the low density solar environment generatedramatically different possible heliosphere configurations, with a wide rangeof particle fluxes of interstellar neutrals, their secondary products, and GCRsarriving at Earth. Simple models of the distribution and densities of ISM inthe downwind direction give cloud transition timescales that can be directlycompared with cosmogenic radionuclide geologic records. Both the interstellardata and cosmogenic radionuclide data are consistent with cloud transitionsduring the Holocene, with large and assumption-dependent uncertainties. Thegeomagnetic timeline derived from cosmic ray fluxes at Earth may requireadjustment to account for the disappearance of anomalous cosmic rays when theSun is immersed in ionized gas.

Time-variability in the Interstellar Boundary Conditions of the Heliosphere: Effect of the Solar Journey on the Galactic Cosmic Ray Flux at Earth