Abstract

After the exciting in-situ observations of the ter- mination shock and the entry of the Voyager 1 spacecraft in the heliosheath, there is a growing awareness of the signifi- cance of the physics of the outer heliosphere. Its understand- ing helps to clarify the structure of our immediate interstellar neighbourhood, contributes to the clarification of fundamen- tal astrophysical processes like the acceleration of charged particles at a steller wind termination shock, and also sheds light on the question to what extent interstellar-terrestrial re- lations are important for the environment of and on the Earth. Consequently, there are new seriously discussed suggestions for sending a modern spacecraft into the heliosheath and be- yond. One of those candidates is the Interstellar Heliopause Probe (IHP) that has been studied in a Technology Reference Study by ESA/ESTEC. Here, we discuss the science objec- tives and expected scientific performance of this mission.

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