Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1039..418r&link_type=abstract
PARTICLE ACCELERATION AND TRANSPORT IN THE HELIOSPHERE AND BEYOND: 7th Annual International Astrophysics Conference. AIP Confer
Astronomy and Astrophysics
Astrophysics
Astronomical Observations, Heliopause And Solar Wind Termination, Planetary Bow Shocks, Interplanetary Shocks, Interplanetary Magnetic Fields, Magnetohydrodynamics And Plasmas, Plasma Production And Heating
Scientific paper
Voyager 2 (V2) crossed the termination shock in August 2007 and is now making the first plasma measurements of the heliosheath. We describe the plasma data near the termination shock and in the heliosheath. The shock was quasi-perpendicular with a shock speed of about 100 km/s. The solar wind speed decreased before the shock crossing, from 400 to 300 km/s. Most of the solar wind flow energy did not go into the thermal plasma; the average proton temperature in the heliosheath was 105 K, well below the predicted temperature of 106 K. Most the the flow energy seems to go into the pickup ions. The heliosheath is highly variable, with plasma flow speeds of 100-170 km/s. The crossing of the shock by Voyager 2 at 84 AU compared to the 94 AU distance observed by Voyager 1 (V1) shows that the heliosphere is asymmetric, since only about 2-3 AU of this difference can be ascribed to solar wind pressure changes.
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