Voyager 2 Plasma Observations

Physics

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2124 Heliopause And Solar Wind Termination, 2126 Heliosphere/Interstellar Medium Interactions, 2139 Interplanetary Shocks, 2144 Interstellar Gas, 2164 Solar Wind Plasma

Scientific paper

Voyager 1 crossed the termination shock in December 2004 but started seeing shock precursors several years before the actual shock crossing. Voyager 2 has started observing shock precursors; since the plasma instrument of Voyager 2 is working we have an opportunity to study the relation of the precursors to solar wind changes. We report on these relations. Voyager 2 still serves as our best monitor of the solar wind material (now altered by the shock) reaching Voyager 1. We discuss the the expected shock motion and possible links between Voyager 1 data and solar wind events observed at Voyager 2. Finally, Ulysses and Voyager 2 are now at similar heliolatitudes and we can start to make predictions for the expected speed at Voyager 2 when the solar wind now observed at Ulysses arrives at Voyager 1. The slowdown observed should give a good estimate of the interstellar H density at the termination shock.

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