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The heliosphere is the magnetic structure formed by the Sun's atmosphereextending into the local interstellar medium (ISM). The boundary separating theheliosphere from the ISM is a still largely unexplored region of space. Eventhough both Voyager spacecraft entered the local ISM and are delivering data,they are two points piercing a vast region of space at specific times. Theheliospheric boundary regulates the penetration of MeV- GeV galactic cosmicrays (CR) in the inner heliosphere. Interstellar keV neutral atoms are crucialto the outer heliosphere since they can penetrate unperturbed and transferenergy to the solar wind. Missions such as NASA's IBEX and Cassini are designedto detect neutral atoms and monitor charge exchange processes at theheliospheric boundary. The heliosphere does not modulate the TeV CR intensity,but it does influence their arrival direction distribution. Ground-based CRobservatories have provided accurate maps of CR anisotropy as a function ofenergy in the last couple of decades. Combining observations to produce all-skycoverage makes it possible to investigate the heliosphere's impact on TeV CRparticles. We can numerically calculate the pristine TeV CR distribution in thelocal ISM with state-of-the-art heliosphere models. Only by subtracting theheliospheric influence is it possible to use TeV CR observations to inferpropagation properties and the characteristics of magnetic turbulence in theISM. Numerical calculations of CR particle trajectories through heliosphericmodels provide a complementary tool to probe the boundary region properties. Aprogram boosting heliospheric modeling with emphasis on the boundary region andpromoting combined CR experimental data analyses from multiple experimentsbenefits CR astrophysics and provides additional data and tools to explore theinteraction between the heliosphere and the local ISM.

Using TeV Cosmic Rays to probe the Heliosphere's Boundary with the Local Interstellar Medium