Whitepaper #230 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: basic research. Additional topics: outer heliosphere; emerging opportunities.
We highlight the importance of magnetic reconnection at the Heliopause (HP), both as a key processe driving the interaction between solar and interstellar media, but also as an element of the definition of the HP itself. We explain that discriminating between current interpretations of plasma and magnetic field data near the HP necessitates appropriate measurements which are lacking on V1 and V2.