Plasmas in the outer heliosphere

Details Plasmas in the outer heliosphere Plasmas in the outer heliosphere

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.conf...51b&link_type=abstract

NASA Ames Research Center, International Solar Wind 8 Conference, p. 51

Physics

Heliosphere, Solar Wind, Space Plasmas, Interstellar Matter, Plasma Interactions, Pioneer Space Probes, Voyager 1 Spacecraft, Voyager 2 Spacecraft, Periodic Variations, Boundaries, Temporal Distribution, Heating

Scientific paper

We review the observed properties of the solar wind in the outer heliosphere, including observations from Voyager and the Pioneers, as well as from inner heliospheric probes as appropriate. These observations are crucial to modeling of the heliosphere and its interactions with the interstellar medium, since the wind ram pressure and its temporal variations are important in understanding the distance to the termination shock and heliopause and how those boundaries might vary in time. We focus on results since Solar Wind 7. Among the issues we will discuss are: (1) the time scales for and statistical properties of variations in the ram pressure in the outer heliosphere, and how those variations might affect the morphology of the heliospheric/interstellar medium interface; (2) the question of possible solar wind slowing in the outer heliosphere due to the pick-up of interstellar ions; (3) the issue of whether there is bulk heating of the solar wind associated either with interstellar ion pick-up or with continued heating due to stream-stream interactions; (4) evidence for latitudinal variations in solar wind properties; and (5) the 1.3 year periodicities apparent in the outer heliosphere, and the close correspondence with similar variations seen with inner heliospheric probes.

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