Abstract
Based on our best knowledge of the physical parameters of the LISM, one comes to the conclusion that for the solar system a submagnetosonic configuration of the plasma interface between the LISM and the expanding solar wind plasma is established extending to some 1000 AU distance upwind from the sun. In this region with perturbed interstellar plasma conditions the LISM neutral flow directed towards the inner part of the heliosphere is substantially modulated due to charge exchange interaction processes with the ionized LISM component. Flow velocities, temperatures and densities showing up at the border of the inner solar system can thus not be taken as parameters characterizing the LISM conditions. This interface effect is highly variable for different LISM plasma conditions. The range of the most probable LISM parameters to be expected within this physical scenario is discussed.
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